aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/transformfeedback.c
diff options
context:
space:
mode:
Diffstat (limited to 'mesalib/src/mesa/main/transformfeedback.c')
-rw-r--r--mesalib/src/mesa/main/transformfeedback.c1888
1 files changed, 944 insertions, 944 deletions
diff --git a/mesalib/src/mesa/main/transformfeedback.c b/mesalib/src/mesa/main/transformfeedback.c
index 5c8c1fd22..6368f9325 100644
--- a/mesalib/src/mesa/main/transformfeedback.c
+++ b/mesalib/src/mesa/main/transformfeedback.c
@@ -1,944 +1,944 @@
-/*
- * Mesa 3-D graphics library
- *
- * Copyright (C) 2010 VMware, Inc. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-/*
- * Vertex transform feedback support.
- *
- * Authors:
- * Brian Paul
- */
-
-
-#include "buffers.h"
-#include "bufferobj.h"
-#include "context.h"
-#include "hash.h"
-#include "transformfeedback.h"
-#include "shaderapi.h"
-#include "shaderobj.h"
-#include "main/dispatch.h"
-
-#include "program/prog_parameter.h"
-//#include "program/shader_api.h"
-
-
-#if FEATURE_EXT_transform_feedback
-
-
-/**
- * Do reference counting of transform feedback buffers.
- */
-static void
-reference_transform_feedback_object(struct gl_transform_feedback_object **ptr,
- struct gl_transform_feedback_object *obj)
-{
- if (*ptr == obj)
- return;
-
- if (*ptr) {
- /* Unreference the old object */
- struct gl_transform_feedback_object *oldObj = *ptr;
-
- ASSERT(oldObj->RefCount > 0);
- oldObj->RefCount--;
-
- if (oldObj->RefCount == 0) {
- GET_CURRENT_CONTEXT(ctx);
- if (ctx)
- ctx->Driver.DeleteTransformFeedback(ctx, oldObj);
- }
-
- *ptr = NULL;
- }
- ASSERT(!*ptr);
-
- if (obj) {
- /* reference new object */
- if (obj->RefCount == 0) {
- _mesa_problem(NULL, "referencing deleted transform feedback object");
- *ptr = NULL;
- }
- else {
- obj->RefCount++;
- *ptr = obj;
- }
- }
-}
-
-
-/**
- * Check if the given primitive mode (as in glBegin(mode)) is compatible
- * with the current transform feedback mode (if it's enabled).
- * This is to be called from glBegin(), glDrawArrays(), glDrawElements(), etc.
- *
- * \return GL_TRUE if the mode is OK, GL_FALSE otherwise.
- */
-GLboolean
-_mesa_validate_primitive_mode(GLcontext *ctx, GLenum mode)
-{
- if (ctx->TransformFeedback.CurrentObject->Active) {
- switch (mode) {
- case GL_POINTS:
- return ctx->TransformFeedback.Mode == GL_POINTS;
- case GL_LINES:
- case GL_LINE_STRIP:
- case GL_LINE_LOOP:
- return ctx->TransformFeedback.Mode == GL_LINES;
- default:
- return ctx->TransformFeedback.Mode == GL_TRIANGLES;
- }
- }
- return GL_TRUE;
-}
-
-
-/**
- * Check that all the buffer objects currently bound for transform
- * feedback actually exist. Raise a GL_INVALID_OPERATION error if
- * any buffers are missing.
- * \return GL_TRUE for success, GL_FALSE if error
- */
-GLboolean
-_mesa_validate_transform_feedback_buffers(GLcontext *ctx)
-{
- /* XXX to do */
- return GL_TRUE;
-}
-
-
-
-/**
- * Per-context init for transform feedback.
- */
-void
-_mesa_init_transform_feedback(GLcontext *ctx)
-{
- /* core mesa expects this, even a dummy one, to be available */
- ASSERT(ctx->Driver.NewTransformFeedback);
-
- ctx->TransformFeedback.DefaultObject =
- ctx->Driver.NewTransformFeedback(ctx, 0);
-
- assert(ctx->TransformFeedback.DefaultObject->RefCount == 1);
-
- reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
- ctx->TransformFeedback.DefaultObject);
-
- assert(ctx->TransformFeedback.DefaultObject->RefCount == 2);
-
- ctx->TransformFeedback.Objects = _mesa_NewHashTable();
-
- _mesa_reference_buffer_object(ctx,
- &ctx->TransformFeedback.CurrentBuffer,
- ctx->Shared->NullBufferObj);
-}
-
-
-
-/**
- * Callback for _mesa_HashDeleteAll().
- */
-static void
-delete_cb(GLuint key, void *data, void *userData)
-{
- GLcontext *ctx = (GLcontext *) userData;
- struct gl_transform_feedback_object *obj =
- (struct gl_transform_feedback_object *) data;
-
- ctx->Driver.DeleteTransformFeedback(ctx, obj);
-}
-
-
-/**
- * Per-context free/clean-up for transform feedback.
- */
-void
-_mesa_free_transform_feedback(GLcontext *ctx)
-{
- /* core mesa expects this, even a dummy one, to be available */
- ASSERT(ctx->Driver.NewTransformFeedback);
-
- _mesa_reference_buffer_object(ctx,
- &ctx->TransformFeedback.CurrentBuffer,
- NULL);
-
- /* Delete all feedback objects */
- _mesa_HashDeleteAll(ctx->TransformFeedback.Objects, delete_cb, ctx);
- _mesa_DeleteHashTable(ctx->TransformFeedback.Objects);
-
- /* Delete the default feedback object */
- assert(ctx->Driver.DeleteTransformFeedback);
- ctx->Driver.DeleteTransformFeedback(ctx,
- ctx->TransformFeedback.DefaultObject);
-
- ctx->TransformFeedback.CurrentObject = NULL;
-}
-
-
-#else /* FEATURE_EXT_transform_feedback */
-
-/* forward declarations */
-static struct gl_transform_feedback_object *
-new_transform_feedback(GLcontext *ctx, GLuint name);
-
-static void
-delete_transform_feedback(GLcontext *ctx,
- struct gl_transform_feedback_object *obj);
-
-/* dummy per-context init/clean-up for transform feedback */
-void
-_mesa_init_transform_feedback(GLcontext *ctx)
-{
- ctx->TransformFeedback.DefaultObject = new_transform_feedback(ctx, 0);
- ctx->TransformFeedback.CurrentObject = ctx->TransformFeedback.DefaultObject;
- _mesa_reference_buffer_object(ctx,
- &ctx->TransformFeedback.CurrentBuffer,
- ctx->Shared->NullBufferObj);
-}
-
-void
-_mesa_free_transform_feedback(GLcontext *ctx)
-{
- _mesa_reference_buffer_object(ctx,
- &ctx->TransformFeedback.CurrentBuffer,
- NULL);
- ctx->TransformFeedback.CurrentObject = NULL;
- delete_transform_feedback(ctx, ctx->TransformFeedback.DefaultObject);
-}
-
-#endif /* FEATURE_EXT_transform_feedback */
-
-
-/** Default fallback for ctx->Driver.NewTransformFeedback() */
-static struct gl_transform_feedback_object *
-new_transform_feedback(GLcontext *ctx, GLuint name)
-{
- struct gl_transform_feedback_object *obj;
- obj = CALLOC_STRUCT(gl_transform_feedback_object);
- if (obj) {
- obj->Name = name;
- obj->RefCount = 1;
- }
- return obj;
-}
-
-/** Default fallback for ctx->Driver.DeleteTransformFeedback() */
-static void
-delete_transform_feedback(GLcontext *ctx,
- struct gl_transform_feedback_object *obj)
-{
- GLuint i;
-
- for (i = 0; i < Elements(obj->Buffers); i++) {
- _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
- }
-
- free(obj);
-}
-
-
-#if FEATURE_EXT_transform_feedback
-
-
-/** Default fallback for ctx->Driver.BeginTransformFeedback() */
-static void
-begin_transform_feedback(GLcontext *ctx, GLenum mode,
- struct gl_transform_feedback_object *obj)
-{
- /* nop */
-}
-
-/** Default fallback for ctx->Driver.EndTransformFeedback() */
-static void
-end_transform_feedback(GLcontext *ctx,
- struct gl_transform_feedback_object *obj)
-{
- /* nop */
-}
-
-/** Default fallback for ctx->Driver.PauseTransformFeedback() */
-static void
-pause_transform_feedback(GLcontext *ctx,
- struct gl_transform_feedback_object *obj)
-{
- /* nop */
-}
-
-/** Default fallback for ctx->Driver.ResumeTransformFeedback() */
-static void
-resume_transform_feedback(GLcontext *ctx,
- struct gl_transform_feedback_object *obj)
-{
- /* nop */
-}
-
-/** Default fallback for ctx->Driver.DrawTransformFeedback() */
-static void
-draw_transform_feedback(GLcontext *ctx, GLenum mode,
- struct gl_transform_feedback_object *obj)
-{
- /* XXX to do */
- /*
- * Get number of vertices in obj's feedback buffer.
- * Call ctx->Exec.DrawArrays(mode, 0, count);
- */
-}
-
-
-/**
- * Plug in default device driver functions for transform feedback.
- * Most drivers will override some/all of these.
- */
-void
-_mesa_init_transform_feedback_functions(struct dd_function_table *driver)
-{
- driver->NewTransformFeedback = new_transform_feedback;
- driver->DeleteTransformFeedback = delete_transform_feedback;
- driver->BeginTransformFeedback = begin_transform_feedback;
- driver->EndTransformFeedback = end_transform_feedback;
- driver->PauseTransformFeedback = pause_transform_feedback;
- driver->ResumeTransformFeedback = resume_transform_feedback;
- driver->DrawTransformFeedback = draw_transform_feedback;
-}
-
-
-void
-_mesa_init_transform_feedback_dispatch(struct _glapi_table *disp)
-{
- SET_BeginTransformFeedbackEXT(disp, _mesa_BeginTransformFeedback);
- SET_EndTransformFeedbackEXT(disp, _mesa_EndTransformFeedback);
- SET_BindBufferRangeEXT(disp, _mesa_BindBufferRange);
- SET_BindBufferBaseEXT(disp, _mesa_BindBufferBase);
- SET_BindBufferOffsetEXT(disp, _mesa_BindBufferOffsetEXT);
- SET_TransformFeedbackVaryingsEXT(disp, _mesa_TransformFeedbackVaryings);
- SET_GetTransformFeedbackVaryingEXT(disp, _mesa_GetTransformFeedbackVarying);
-}
-
-
-/**
- ** Begin API functions
- **/
-
-
-void GLAPIENTRY
-_mesa_BeginTransformFeedback(GLenum mode)
-{
- struct gl_transform_feedback_object *obj;
- GET_CURRENT_CONTEXT(ctx);
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- switch (mode) {
- case GL_POINTS:
- case GL_LINES:
- case GL_TRIANGLES:
- /* legal */
- break;
- default:
- _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)");
- return;
- }
-
- if (obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBeginTransformFeedback(already active)");
- return;
- }
-
- obj->Active = GL_TRUE;
- ctx->TransformFeedback.Mode = mode;
-
- assert(ctx->Driver.BeginTransformFeedback);
- ctx->Driver.BeginTransformFeedback(ctx, mode, obj);
-}
-
-
-void GLAPIENTRY
-_mesa_EndTransformFeedback(void)
-{
- struct gl_transform_feedback_object *obj;
- GET_CURRENT_CONTEXT(ctx);
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (!obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glEndTransformFeedback(not active)");
- return;
- }
-
- ctx->TransformFeedback.CurrentObject->Active = GL_FALSE;
-
- assert(ctx->Driver.EndTransformFeedback);
- ctx->Driver.EndTransformFeedback(ctx, obj);
-}
-
-
-/**
- * Helper used by BindBufferRange() and BindBufferBase().
- */
-static void
-bind_buffer_range(GLcontext *ctx, GLuint index,
- struct gl_buffer_object *bufObj,
- GLintptr offset, GLsizeiptr size)
-{
- struct gl_transform_feedback_object *obj =
- ctx->TransformFeedback.CurrentObject;
-
- /* The general binding point */
- _mesa_reference_buffer_object(ctx,
- &ctx->TransformFeedback.CurrentBuffer,
- bufObj);
-
- /* The per-attribute binding point */
- _mesa_reference_buffer_object(ctx,
- &obj->Buffers[index],
- bufObj);
-
- obj->BufferNames[index] = bufObj->Name;
-
- obj->Offset[index] = offset;
- obj->Size[index] = size;
-}
-
-
-/**
- * Specify a buffer object to receive vertex shader results. Plus,
- * specify the starting offset to place the results, and max size.
- */
-void GLAPIENTRY
-_mesa_BindBufferRange(GLenum target, GLuint index,
- GLuint buffer, GLintptr offset, GLsizeiptr size)
-{
- struct gl_transform_feedback_object *obj;
- struct gl_buffer_object *bufObj;
- GET_CURRENT_CONTEXT(ctx);
-
- if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)");
- return;
- }
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferRange(transform feedback active)");
- return;
- }
-
- if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
- return;
- }
-
- if ((size <= 0) || (size & 0x3)) {
- /* must be positive and multiple of four */
- _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size%d)", (int) size);
- return;
- }
-
- if (offset & 0x3) {
- /* must be multiple of four */
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glBindBufferRange(offset=%d)", (int) offset);
- return;
- }
-
- bufObj = _mesa_lookup_bufferobj(ctx, buffer);
- if (!bufObj) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferRange(invalid buffer=%u)", buffer);
- return;
- }
-
- if (offset + size >= bufObj->Size) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glBindBufferRange(offset + size %d > buffer size %d)",
- (int) (offset + size), (int) (bufObj->Size));
- return;
- }
-
- bind_buffer_range(ctx, index, bufObj, offset, size);
-}
-
-
-/**
- * Specify a buffer object to receive vertex shader results.
- * As above, but start at offset = 0.
- */
-void GLAPIENTRY
-_mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer)
-{
- struct gl_transform_feedback_object *obj;
- struct gl_buffer_object *bufObj;
- GLsizeiptr size;
- GET_CURRENT_CONTEXT(ctx);
-
- if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)");
- return;
- }
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferRange(transform feedback active)");
- return;
- }
-
- if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
- return;
- }
-
- bufObj = _mesa_lookup_bufferobj(ctx, buffer);
- if (!bufObj) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferBase(invalid buffer=%u)", buffer);
- return;
- }
-
- /* default size is the buffer size rounded down to nearest
- * multiple of four.
- */
- size = bufObj->Size & ~0x3;
-
- bind_buffer_range(ctx, index, bufObj, 0, size);
-}
-
-
-/**
- * Specify a buffer object to receive vertex shader results, plus the
- * offset in the buffer to start placing results.
- * This function is part of GL_EXT_transform_feedback, but not GL3.
- */
-void GLAPIENTRY
-_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
- GLintptr offset)
-{
- struct gl_transform_feedback_object *obj;
- struct gl_buffer_object *bufObj;
- GET_CURRENT_CONTEXT(ctx);
- GLsizeiptr size;
-
- if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
- return;
- }
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferRange(transform feedback active)");
- return;
- }
-
- if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glBindBufferOffsetEXT(index=%d)", index);
- return;
- }
-
- bufObj = _mesa_lookup_bufferobj(ctx, buffer);
- if (!bufObj) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
- return;
- }
-
- /* default size is the buffer size rounded down to nearest
- * multiple of four.
- */
- size = (bufObj->Size - offset) & ~0x3;
-
- bind_buffer_range(ctx, index, bufObj, offset, size);
-}
-
-
-/**
- * This function specifies the vertex shader outputs to be written
- * to the feedback buffer(s), and in what order.
- */
-void GLAPIENTRY
-_mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
- const GLchar **varyings, GLenum bufferMode)
-{
- struct gl_shader_program *shProg;
- GLuint i;
- GET_CURRENT_CONTEXT(ctx);
-
- switch (bufferMode) {
- case GL_INTERLEAVED_ATTRIBS:
- break;
- case GL_SEPARATE_ATTRIBS:
- break;
- default:
- _mesa_error(ctx, GL_INVALID_ENUM,
- "glTransformFeedbackVaryings(bufferMode)");
- return;
- }
-
- if (count < 0 || count > ctx->Const.MaxTransformFeedbackSeparateAttribs) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glTransformFeedbackVaryings(count=%d)", count);
- return;
- }
-
- shProg = _mesa_lookup_shader_program(ctx, program);
- if (!shProg) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glTransformFeedbackVaryings(program=%u)", program);
- return;
- }
-
- /* free existing varyings, if any */
- for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
- free(shProg->TransformFeedback.VaryingNames[i]);
- }
- free(shProg->TransformFeedback.VaryingNames);
-
- /* allocate new memory for varying names */
- shProg->TransformFeedback.VaryingNames =
- (GLchar **) malloc(count * sizeof(GLchar *));
-
- if (!shProg->TransformFeedback.VaryingNames) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
- return;
- }
-
- /* Save the new names and the count */
- for (i = 0; i < (GLuint) count; i++) {
- shProg->TransformFeedback.VaryingNames[i] = _mesa_strdup(varyings[i]);
- }
- shProg->TransformFeedback.NumVarying = count;
-
- shProg->TransformFeedback.BufferMode = bufferMode;
-
- /* The varyings won't be used until shader link time */
-}
-
-
-/**
- * Get info about the vertex shader's outputs which are to be written
- * to the feedback buffer(s).
- */
-void GLAPIENTRY
-_mesa_GetTransformFeedbackVarying(GLuint program, GLuint index,
- GLsizei bufSize, GLsizei *length,
- GLsizei *size, GLenum *type, GLchar *name)
-{
- const struct gl_shader_program *shProg;
- const GLchar *varyingName;
- GLint v;
- GET_CURRENT_CONTEXT(ctx);
-
- shProg = _mesa_lookup_shader_program(ctx, program);
- if (!shProg) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glGetTransformFeedbackVaryings(program=%u)", program);
- return;
- }
-
- if (index >= shProg->TransformFeedback.NumVarying) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glGetTransformFeedbackVaryings(index=%u)", index);
- return;
- }
-
- varyingName = shProg->TransformFeedback.VaryingNames[index];
-
- v = _mesa_lookup_parameter_index(shProg->Varying, -1, varyingName);
- if (v >= 0) {
- struct gl_program_parameter *param = &shProg->Varying->Parameters[v];
-
- /* return the varying's name and length */
- _mesa_copy_string(name, bufSize, length, varyingName);
-
- /* return the datatype and value's size (in datatype units) */
- if (type)
- *type = param->DataType;
- if (size)
- *size = param->Size;
- }
- else {
- name[0] = 0;
- if (length)
- *length = 0;
- if (type)
- *type = 0;
- if (size)
- *size = 0;
- }
-}
-
-
-
-static struct gl_transform_feedback_object *
-lookup_transform_feedback_object(GLcontext *ctx, GLuint name)
-{
- if (name == 0) {
- return ctx->TransformFeedback.DefaultObject;
- }
- else
- return (struct gl_transform_feedback_object *)
- _mesa_HashLookup(ctx->TransformFeedback.Objects, name);
-}
-
-
-/**
- * Create new transform feedback objects. Transform feedback objects
- * encapsulate the state related to transform feedback to allow quickly
- * switching state (and drawing the results, below).
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_GenTransformFeedbacks(GLsizei n, GLuint *names)
-{
- GLuint first;
- GET_CURRENT_CONTEXT(ctx);
-
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (n < 0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glGenTransformFeedbacks(n < 0)");
- return;
- }
-
- if (!names)
- return;
-
- /* we don't need contiguous IDs, but this might be faster */
- first = _mesa_HashFindFreeKeyBlock(ctx->TransformFeedback.Objects, n);
- if (first) {
- GLsizei i;
- for (i = 0; i < n; i++) {
- struct gl_transform_feedback_object *obj
- = ctx->Driver.NewTransformFeedback(ctx, first + i);
- if (!obj) {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks");
- return;
- }
- names[i] = first + i;
- _mesa_HashInsert(ctx->TransformFeedback.Objects, first + i, obj);
- }
- }
- else {
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks");
- }
-}
-
-
-/**
- * Is the given ID a transform feedback object?
- * Part of GL_ARB_transform_feedback2.
- */
-GLboolean GLAPIENTRY
-_mesa_IsTransformFeedback(GLuint name)
-{
- GET_CURRENT_CONTEXT(ctx);
-
- ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
-
- if (name && lookup_transform_feedback_object(ctx, name))
- return GL_TRUE;
- else
- return GL_FALSE;
-}
-
-
-/**
- * Bind the given transform feedback object.
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_BindTransformFeedback(GLenum target, GLuint name)
-{
- struct gl_transform_feedback_object *obj;
- GET_CURRENT_CONTEXT(ctx);
-
- if (target != GL_TRANSFORM_FEEDBACK) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBindTransformFeedback(target)");
- return;
- }
-
- if (ctx->TransformFeedback.CurrentObject->Active &&
- !ctx->TransformFeedback.CurrentObject->Paused) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindTransformFeedback(transform is active, or not paused)");
- return;
- }
-
- obj = lookup_transform_feedback_object(ctx, name);
- if (!obj) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBindTransformFeedback(name=%u)", name);
- return;
- }
-
- reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
- obj);
-}
-
-
-/**
- * Delete the given transform feedback objects.
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_DeleteTransformFeedbacks(GLsizei n, const GLuint *names)
-{
- GLint i;
- GET_CURRENT_CONTEXT(ctx);
-
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (n < 0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteTransformFeedbacks(n < 0)");
- return;
- }
-
- if (!names)
- return;
-
- for (i = 0; i < n; i++) {
- if (names[i] > 0) {
- struct gl_transform_feedback_object *obj
- = lookup_transform_feedback_object(ctx, names[i]);
- if (obj) {
- if (obj->Active) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glDeleteTransformFeedbacks(object %u is active)",
- names[i]);
- return;
- }
- _mesa_HashRemove(ctx->TransformFeedback.Objects, names[i]);
- /* unref, but object may not be deleted until later */
- reference_transform_feedback_object(&obj, NULL);
- }
- }
- }
-}
-
-
-/**
- * Pause transform feedback.
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_PauseTransformFeedback(void)
-{
- struct gl_transform_feedback_object *obj;
- GET_CURRENT_CONTEXT(ctx);
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (!obj->Active || obj->Paused) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glPauseTransformFeedback(feedback not active or already paused)");
- return;
- }
-
- obj->Paused = GL_TRUE;
-
- assert(ctx->Driver.PauseTransformFeedback);
- ctx->Driver.PauseTransformFeedback(ctx, obj);
-}
-
-
-/**
- * Resume transform feedback.
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_ResumeTransformFeedback(void)
-{
- struct gl_transform_feedback_object *obj;
- GET_CURRENT_CONTEXT(ctx);
-
- obj = ctx->TransformFeedback.CurrentObject;
-
- if (!obj->Active || !obj->Paused) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glPauseTransformFeedback(feedback not active or not paused)");
- return;
- }
-
- obj->Paused = GL_FALSE;
-
- assert(ctx->Driver.ResumeTransformFeedback);
- ctx->Driver.ResumeTransformFeedback(ctx, obj);
-}
-
-
-/**
- * Draw the vertex data in a transform feedback object.
- * \param mode GL_POINTS, GL_LINES, GL_TRIANGLE_STRIP, etc.
- * \param name the transform feedback object
- * The number of vertices comes from the transform feedback object.
- * User still has to setup of the vertex attribute info with
- * glVertexPointer, glColorPointer, etc.
- * Part of GL_ARB_transform_feedback2.
- */
-void GLAPIENTRY
-_mesa_DrawTransformFeedback(GLenum mode, GLuint name)
-{
- GET_CURRENT_CONTEXT(ctx);
- struct gl_transform_feedback_object *obj =
- lookup_transform_feedback_object(ctx, name);
-
- if (mode > GL_POLYGON) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "glDrawTransformFeedback(mode=0x%x)", mode);
- return;
- }
- if (!obj) {
- _mesa_error(ctx, GL_INVALID_VALUE,
- "glDrawTransformFeedback(name = %u)", name);
- return;
- }
-
- /* XXX check if EndTransformFeedback has never been called while
- * the object was bound
- */
-
- assert(ctx->Driver.DrawTransformFeedback);
- ctx->Driver.DrawTransformFeedback(ctx, mode, obj);
-}
-
-
-/*
-XXX misc to do:
-
-glGet*() for
-
-GL_TRANSFORM_FEEDBACK_BUFFER_PAUSED
-GL_TRANSFORM_FEEDBACK_BUFFER_ACTIVE
-GL_TRANSFORM_FEEDBACK_BINDING
-*/
-
-
-#endif /* FEATURE_EXT_transform_feedback */
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2010 VMware, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Vertex transform feedback support.
+ *
+ * Authors:
+ * Brian Paul
+ */
+
+
+#include "buffers.h"
+#include "bufferobj.h"
+#include "context.h"
+#include "hash.h"
+#include "transformfeedback.h"
+#include "shaderapi.h"
+#include "shaderobj.h"
+#include "main/dispatch.h"
+
+#include "program/prog_parameter.h"
+//#include "program/shader_api.h"
+
+
+#if FEATURE_EXT_transform_feedback
+
+
+/**
+ * Do reference counting of transform feedback buffers.
+ */
+static void
+reference_transform_feedback_object(struct gl_transform_feedback_object **ptr,
+ struct gl_transform_feedback_object *obj)
+{
+ if (*ptr == obj)
+ return;
+
+ if (*ptr) {
+ /* Unreference the old object */
+ struct gl_transform_feedback_object *oldObj = *ptr;
+
+ ASSERT(oldObj->RefCount > 0);
+ oldObj->RefCount--;
+
+ if (oldObj->RefCount == 0) {
+ GET_CURRENT_CONTEXT(ctx);
+ if (ctx)
+ ctx->Driver.DeleteTransformFeedback(ctx, oldObj);
+ }
+
+ *ptr = NULL;
+ }
+ ASSERT(!*ptr);
+
+ if (obj) {
+ /* reference new object */
+ if (obj->RefCount == 0) {
+ _mesa_problem(NULL, "referencing deleted transform feedback object");
+ *ptr = NULL;
+ }
+ else {
+ obj->RefCount++;
+ *ptr = obj;
+ }
+ }
+}
+
+
+/**
+ * Check if the given primitive mode (as in glBegin(mode)) is compatible
+ * with the current transform feedback mode (if it's enabled).
+ * This is to be called from glBegin(), glDrawArrays(), glDrawElements(), etc.
+ *
+ * \return GL_TRUE if the mode is OK, GL_FALSE otherwise.
+ */
+GLboolean
+_mesa_validate_primitive_mode(struct gl_context *ctx, GLenum mode)
+{
+ if (ctx->TransformFeedback.CurrentObject->Active) {
+ switch (mode) {
+ case GL_POINTS:
+ return ctx->TransformFeedback.Mode == GL_POINTS;
+ case GL_LINES:
+ case GL_LINE_STRIP:
+ case GL_LINE_LOOP:
+ return ctx->TransformFeedback.Mode == GL_LINES;
+ default:
+ return ctx->TransformFeedback.Mode == GL_TRIANGLES;
+ }
+ }
+ return GL_TRUE;
+}
+
+
+/**
+ * Check that all the buffer objects currently bound for transform
+ * feedback actually exist. Raise a GL_INVALID_OPERATION error if
+ * any buffers are missing.
+ * \return GL_TRUE for success, GL_FALSE if error
+ */
+GLboolean
+_mesa_validate_transform_feedback_buffers(struct gl_context *ctx)
+{
+ /* XXX to do */
+ return GL_TRUE;
+}
+
+
+
+/**
+ * Per-context init for transform feedback.
+ */
+void
+_mesa_init_transform_feedback(struct gl_context *ctx)
+{
+ /* core mesa expects this, even a dummy one, to be available */
+ ASSERT(ctx->Driver.NewTransformFeedback);
+
+ ctx->TransformFeedback.DefaultObject =
+ ctx->Driver.NewTransformFeedback(ctx, 0);
+
+ assert(ctx->TransformFeedback.DefaultObject->RefCount == 1);
+
+ reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
+ ctx->TransformFeedback.DefaultObject);
+
+ assert(ctx->TransformFeedback.DefaultObject->RefCount == 2);
+
+ ctx->TransformFeedback.Objects = _mesa_NewHashTable();
+
+ _mesa_reference_buffer_object(ctx,
+ &ctx->TransformFeedback.CurrentBuffer,
+ ctx->Shared->NullBufferObj);
+}
+
+
+
+/**
+ * Callback for _mesa_HashDeleteAll().
+ */
+static void
+delete_cb(GLuint key, void *data, void *userData)
+{
+ struct gl_context *ctx = (struct gl_context *) userData;
+ struct gl_transform_feedback_object *obj =
+ (struct gl_transform_feedback_object *) data;
+
+ ctx->Driver.DeleteTransformFeedback(ctx, obj);
+}
+
+
+/**
+ * Per-context free/clean-up for transform feedback.
+ */
+void
+_mesa_free_transform_feedback(struct gl_context *ctx)
+{
+ /* core mesa expects this, even a dummy one, to be available */
+ ASSERT(ctx->Driver.NewTransformFeedback);
+
+ _mesa_reference_buffer_object(ctx,
+ &ctx->TransformFeedback.CurrentBuffer,
+ NULL);
+
+ /* Delete all feedback objects */
+ _mesa_HashDeleteAll(ctx->TransformFeedback.Objects, delete_cb, ctx);
+ _mesa_DeleteHashTable(ctx->TransformFeedback.Objects);
+
+ /* Delete the default feedback object */
+ assert(ctx->Driver.DeleteTransformFeedback);
+ ctx->Driver.DeleteTransformFeedback(ctx,
+ ctx->TransformFeedback.DefaultObject);
+
+ ctx->TransformFeedback.CurrentObject = NULL;
+}
+
+
+#else /* FEATURE_EXT_transform_feedback */
+
+/* forward declarations */
+static struct gl_transform_feedback_object *
+new_transform_feedback(struct gl_context *ctx, GLuint name);
+
+static void
+delete_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj);
+
+/* dummy per-context init/clean-up for transform feedback */
+void
+_mesa_init_transform_feedback(struct gl_context *ctx)
+{
+ ctx->TransformFeedback.DefaultObject = new_transform_feedback(ctx, 0);
+ ctx->TransformFeedback.CurrentObject = ctx->TransformFeedback.DefaultObject;
+ _mesa_reference_buffer_object(ctx,
+ &ctx->TransformFeedback.CurrentBuffer,
+ ctx->Shared->NullBufferObj);
+}
+
+void
+_mesa_free_transform_feedback(struct gl_context *ctx)
+{
+ _mesa_reference_buffer_object(ctx,
+ &ctx->TransformFeedback.CurrentBuffer,
+ NULL);
+ ctx->TransformFeedback.CurrentObject = NULL;
+ delete_transform_feedback(ctx, ctx->TransformFeedback.DefaultObject);
+}
+
+#endif /* FEATURE_EXT_transform_feedback */
+
+
+/** Default fallback for ctx->Driver.NewTransformFeedback() */
+static struct gl_transform_feedback_object *
+new_transform_feedback(struct gl_context *ctx, GLuint name)
+{
+ struct gl_transform_feedback_object *obj;
+ obj = CALLOC_STRUCT(gl_transform_feedback_object);
+ if (obj) {
+ obj->Name = name;
+ obj->RefCount = 1;
+ }
+ return obj;
+}
+
+/** Default fallback for ctx->Driver.DeleteTransformFeedback() */
+static void
+delete_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj)
+{
+ GLuint i;
+
+ for (i = 0; i < Elements(obj->Buffers); i++) {
+ _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
+ }
+
+ free(obj);
+}
+
+
+#if FEATURE_EXT_transform_feedback
+
+
+/** Default fallback for ctx->Driver.BeginTransformFeedback() */
+static void
+begin_transform_feedback(struct gl_context *ctx, GLenum mode,
+ struct gl_transform_feedback_object *obj)
+{
+ /* nop */
+}
+
+/** Default fallback for ctx->Driver.EndTransformFeedback() */
+static void
+end_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj)
+{
+ /* nop */
+}
+
+/** Default fallback for ctx->Driver.PauseTransformFeedback() */
+static void
+pause_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj)
+{
+ /* nop */
+}
+
+/** Default fallback for ctx->Driver.ResumeTransformFeedback() */
+static void
+resume_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj)
+{
+ /* nop */
+}
+
+/** Default fallback for ctx->Driver.DrawTransformFeedback() */
+static void
+draw_transform_feedback(struct gl_context *ctx, GLenum mode,
+ struct gl_transform_feedback_object *obj)
+{
+ /* XXX to do */
+ /*
+ * Get number of vertices in obj's feedback buffer.
+ * Call ctx->Exec.DrawArrays(mode, 0, count);
+ */
+}
+
+
+/**
+ * Plug in default device driver functions for transform feedback.
+ * Most drivers will override some/all of these.
+ */
+void
+_mesa_init_transform_feedback_functions(struct dd_function_table *driver)
+{
+ driver->NewTransformFeedback = new_transform_feedback;
+ driver->DeleteTransformFeedback = delete_transform_feedback;
+ driver->BeginTransformFeedback = begin_transform_feedback;
+ driver->EndTransformFeedback = end_transform_feedback;
+ driver->PauseTransformFeedback = pause_transform_feedback;
+ driver->ResumeTransformFeedback = resume_transform_feedback;
+ driver->DrawTransformFeedback = draw_transform_feedback;
+}
+
+
+void
+_mesa_init_transform_feedback_dispatch(struct _glapi_table *disp)
+{
+ SET_BeginTransformFeedbackEXT(disp, _mesa_BeginTransformFeedback);
+ SET_EndTransformFeedbackEXT(disp, _mesa_EndTransformFeedback);
+ SET_BindBufferRangeEXT(disp, _mesa_BindBufferRange);
+ SET_BindBufferBaseEXT(disp, _mesa_BindBufferBase);
+ SET_BindBufferOffsetEXT(disp, _mesa_BindBufferOffsetEXT);
+ SET_TransformFeedbackVaryingsEXT(disp, _mesa_TransformFeedbackVaryings);
+ SET_GetTransformFeedbackVaryingEXT(disp, _mesa_GetTransformFeedbackVarying);
+}
+
+
+/**
+ ** Begin API functions
+ **/
+
+
+void GLAPIENTRY
+_mesa_BeginTransformFeedback(GLenum mode)
+{
+ struct gl_transform_feedback_object *obj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ switch (mode) {
+ case GL_POINTS:
+ case GL_LINES:
+ case GL_TRIANGLES:
+ /* legal */
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)");
+ return;
+ }
+
+ if (obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBeginTransformFeedback(already active)");
+ return;
+ }
+
+ obj->Active = GL_TRUE;
+ ctx->TransformFeedback.Mode = mode;
+
+ assert(ctx->Driver.BeginTransformFeedback);
+ ctx->Driver.BeginTransformFeedback(ctx, mode, obj);
+}
+
+
+void GLAPIENTRY
+_mesa_EndTransformFeedback(void)
+{
+ struct gl_transform_feedback_object *obj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (!obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glEndTransformFeedback(not active)");
+ return;
+ }
+
+ ctx->TransformFeedback.CurrentObject->Active = GL_FALSE;
+
+ assert(ctx->Driver.EndTransformFeedback);
+ ctx->Driver.EndTransformFeedback(ctx, obj);
+}
+
+
+/**
+ * Helper used by BindBufferRange() and BindBufferBase().
+ */
+static void
+bind_buffer_range(struct gl_context *ctx, GLuint index,
+ struct gl_buffer_object *bufObj,
+ GLintptr offset, GLsizeiptr size)
+{
+ struct gl_transform_feedback_object *obj =
+ ctx->TransformFeedback.CurrentObject;
+
+ /* The general binding point */
+ _mesa_reference_buffer_object(ctx,
+ &ctx->TransformFeedback.CurrentBuffer,
+ bufObj);
+
+ /* The per-attribute binding point */
+ _mesa_reference_buffer_object(ctx,
+ &obj->Buffers[index],
+ bufObj);
+
+ obj->BufferNames[index] = bufObj->Name;
+
+ obj->Offset[index] = offset;
+ obj->Size[index] = size;
+}
+
+
+/**
+ * Specify a buffer object to receive vertex shader results. Plus,
+ * specify the starting offset to place the results, and max size.
+ */
+void GLAPIENTRY
+_mesa_BindBufferRange(GLenum target, GLuint index,
+ GLuint buffer, GLintptr offset, GLsizeiptr size)
+{
+ struct gl_transform_feedback_object *obj;
+ struct gl_buffer_object *bufObj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferRange(target)");
+ return;
+ }
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferRange(transform feedback active)");
+ return;
+ }
+
+ if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index);
+ return;
+ }
+
+ if ((size <= 0) || (size & 0x3)) {
+ /* must be positive and multiple of four */
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(size%d)", (int) size);
+ return;
+ }
+
+ if (offset & 0x3) {
+ /* must be multiple of four */
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glBindBufferRange(offset=%d)", (int) offset);
+ return;
+ }
+
+ bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+ if (!bufObj) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferRange(invalid buffer=%u)", buffer);
+ return;
+ }
+
+ if (offset + size >= bufObj->Size) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glBindBufferRange(offset + size %d > buffer size %d)",
+ (int) (offset + size), (int) (bufObj->Size));
+ return;
+ }
+
+ bind_buffer_range(ctx, index, bufObj, offset, size);
+}
+
+
+/**
+ * Specify a buffer object to receive vertex shader results.
+ * As above, but start at offset = 0.
+ */
+void GLAPIENTRY
+_mesa_BindBufferBase(GLenum target, GLuint index, GLuint buffer)
+{
+ struct gl_transform_feedback_object *obj;
+ struct gl_buffer_object *bufObj;
+ GLsizeiptr size;
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferBase(target)");
+ return;
+ }
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferRange(transform feedback active)");
+ return;
+ }
+
+ if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index);
+ return;
+ }
+
+ bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+ if (!bufObj) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferBase(invalid buffer=%u)", buffer);
+ return;
+ }
+
+ /* default size is the buffer size rounded down to nearest
+ * multiple of four.
+ */
+ size = bufObj->Size & ~0x3;
+
+ bind_buffer_range(ctx, index, bufObj, 0, size);
+}
+
+
+/**
+ * Specify a buffer object to receive vertex shader results, plus the
+ * offset in the buffer to start placing results.
+ * This function is part of GL_EXT_transform_feedback, but not GL3.
+ */
+void GLAPIENTRY
+_mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
+ GLintptr offset)
+{
+ struct gl_transform_feedback_object *obj;
+ struct gl_buffer_object *bufObj;
+ GET_CURRENT_CONTEXT(ctx);
+ GLsizeiptr size;
+
+ if (target != GL_TRANSFORM_FEEDBACK_BUFFER) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferOffsetEXT(target)");
+ return;
+ }
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferRange(transform feedback active)");
+ return;
+ }
+
+ if (index >= ctx->Const.MaxTransformFeedbackSeparateAttribs) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glBindBufferOffsetEXT(index=%d)", index);
+ return;
+ }
+
+ bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+ if (!bufObj) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindBufferOffsetEXT(invalid buffer=%u)", buffer);
+ return;
+ }
+
+ /* default size is the buffer size rounded down to nearest
+ * multiple of four.
+ */
+ size = (bufObj->Size - offset) & ~0x3;
+
+ bind_buffer_range(ctx, index, bufObj, offset, size);
+}
+
+
+/**
+ * This function specifies the vertex shader outputs to be written
+ * to the feedback buffer(s), and in what order.
+ */
+void GLAPIENTRY
+_mesa_TransformFeedbackVaryings(GLuint program, GLsizei count,
+ const GLchar **varyings, GLenum bufferMode)
+{
+ struct gl_shader_program *shProg;
+ GLuint i;
+ GET_CURRENT_CONTEXT(ctx);
+
+ switch (bufferMode) {
+ case GL_INTERLEAVED_ATTRIBS:
+ break;
+ case GL_SEPARATE_ATTRIBS:
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glTransformFeedbackVaryings(bufferMode)");
+ return;
+ }
+
+ if (count < 0 || count > ctx->Const.MaxTransformFeedbackSeparateAttribs) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glTransformFeedbackVaryings(count=%d)", count);
+ return;
+ }
+
+ shProg = _mesa_lookup_shader_program(ctx, program);
+ if (!shProg) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glTransformFeedbackVaryings(program=%u)", program);
+ return;
+ }
+
+ /* free existing varyings, if any */
+ for (i = 0; i < shProg->TransformFeedback.NumVarying; i++) {
+ free(shProg->TransformFeedback.VaryingNames[i]);
+ }
+ free(shProg->TransformFeedback.VaryingNames);
+
+ /* allocate new memory for varying names */
+ shProg->TransformFeedback.VaryingNames =
+ (GLchar **) malloc(count * sizeof(GLchar *));
+
+ if (!shProg->TransformFeedback.VaryingNames) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTransformFeedbackVaryings()");
+ return;
+ }
+
+ /* Save the new names and the count */
+ for (i = 0; i < (GLuint) count; i++) {
+ shProg->TransformFeedback.VaryingNames[i] = _mesa_strdup(varyings[i]);
+ }
+ shProg->TransformFeedback.NumVarying = count;
+
+ shProg->TransformFeedback.BufferMode = bufferMode;
+
+ /* The varyings won't be used until shader link time */
+}
+
+
+/**
+ * Get info about the vertex shader's outputs which are to be written
+ * to the feedback buffer(s).
+ */
+void GLAPIENTRY
+_mesa_GetTransformFeedbackVarying(GLuint program, GLuint index,
+ GLsizei bufSize, GLsizei *length,
+ GLsizei *size, GLenum *type, GLchar *name)
+{
+ const struct gl_shader_program *shProg;
+ const GLchar *varyingName;
+ GLint v;
+ GET_CURRENT_CONTEXT(ctx);
+
+ shProg = _mesa_lookup_shader_program(ctx, program);
+ if (!shProg) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glGetTransformFeedbackVaryings(program=%u)", program);
+ return;
+ }
+
+ if (index >= shProg->TransformFeedback.NumVarying) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glGetTransformFeedbackVaryings(index=%u)", index);
+ return;
+ }
+
+ varyingName = shProg->TransformFeedback.VaryingNames[index];
+
+ v = _mesa_lookup_parameter_index(shProg->Varying, -1, varyingName);
+ if (v >= 0) {
+ struct gl_program_parameter *param = &shProg->Varying->Parameters[v];
+
+ /* return the varying's name and length */
+ _mesa_copy_string(name, bufSize, length, varyingName);
+
+ /* return the datatype and value's size (in datatype units) */
+ if (type)
+ *type = param->DataType;
+ if (size)
+ *size = param->Size;
+ }
+ else {
+ name[0] = 0;
+ if (length)
+ *length = 0;
+ if (type)
+ *type = 0;
+ if (size)
+ *size = 0;
+ }
+}
+
+
+
+static struct gl_transform_feedback_object *
+lookup_transform_feedback_object(struct gl_context *ctx, GLuint name)
+{
+ if (name == 0) {
+ return ctx->TransformFeedback.DefaultObject;
+ }
+ else
+ return (struct gl_transform_feedback_object *)
+ _mesa_HashLookup(ctx->TransformFeedback.Objects, name);
+}
+
+
+/**
+ * Create new transform feedback objects. Transform feedback objects
+ * encapsulate the state related to transform feedback to allow quickly
+ * switching state (and drawing the results, below).
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_GenTransformFeedbacks(GLsizei n, GLuint *names)
+{
+ GLuint first;
+ GET_CURRENT_CONTEXT(ctx);
+
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (n < 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glGenTransformFeedbacks(n < 0)");
+ return;
+ }
+
+ if (!names)
+ return;
+
+ /* we don't need contiguous IDs, but this might be faster */
+ first = _mesa_HashFindFreeKeyBlock(ctx->TransformFeedback.Objects, n);
+ if (first) {
+ GLsizei i;
+ for (i = 0; i < n; i++) {
+ struct gl_transform_feedback_object *obj
+ = ctx->Driver.NewTransformFeedback(ctx, first + i);
+ if (!obj) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks");
+ return;
+ }
+ names[i] = first + i;
+ _mesa_HashInsert(ctx->TransformFeedback.Objects, first + i, obj);
+ }
+ }
+ else {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTransformFeedbacks");
+ }
+}
+
+
+/**
+ * Is the given ID a transform feedback object?
+ * Part of GL_ARB_transform_feedback2.
+ */
+GLboolean GLAPIENTRY
+_mesa_IsTransformFeedback(GLuint name)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+ if (name && lookup_transform_feedback_object(ctx, name))
+ return GL_TRUE;
+ else
+ return GL_FALSE;
+}
+
+
+/**
+ * Bind the given transform feedback object.
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_BindTransformFeedback(GLenum target, GLuint name)
+{
+ struct gl_transform_feedback_object *obj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ if (target != GL_TRANSFORM_FEEDBACK) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBindTransformFeedback(target)");
+ return;
+ }
+
+ if (ctx->TransformFeedback.CurrentObject->Active &&
+ !ctx->TransformFeedback.CurrentObject->Paused) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindTransformFeedback(transform is active, or not paused)");
+ return;
+ }
+
+ obj = lookup_transform_feedback_object(ctx, name);
+ if (!obj) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBindTransformFeedback(name=%u)", name);
+ return;
+ }
+
+ reference_transform_feedback_object(&ctx->TransformFeedback.CurrentObject,
+ obj);
+}
+
+
+/**
+ * Delete the given transform feedback objects.
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_DeleteTransformFeedbacks(GLsizei n, const GLuint *names)
+{
+ GLint i;
+ GET_CURRENT_CONTEXT(ctx);
+
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (n < 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteTransformFeedbacks(n < 0)");
+ return;
+ }
+
+ if (!names)
+ return;
+
+ for (i = 0; i < n; i++) {
+ if (names[i] > 0) {
+ struct gl_transform_feedback_object *obj
+ = lookup_transform_feedback_object(ctx, names[i]);
+ if (obj) {
+ if (obj->Active) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glDeleteTransformFeedbacks(object %u is active)",
+ names[i]);
+ return;
+ }
+ _mesa_HashRemove(ctx->TransformFeedback.Objects, names[i]);
+ /* unref, but object may not be deleted until later */
+ reference_transform_feedback_object(&obj, NULL);
+ }
+ }
+ }
+}
+
+
+/**
+ * Pause transform feedback.
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_PauseTransformFeedback(void)
+{
+ struct gl_transform_feedback_object *obj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (!obj->Active || obj->Paused) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glPauseTransformFeedback(feedback not active or already paused)");
+ return;
+ }
+
+ obj->Paused = GL_TRUE;
+
+ assert(ctx->Driver.PauseTransformFeedback);
+ ctx->Driver.PauseTransformFeedback(ctx, obj);
+}
+
+
+/**
+ * Resume transform feedback.
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_ResumeTransformFeedback(void)
+{
+ struct gl_transform_feedback_object *obj;
+ GET_CURRENT_CONTEXT(ctx);
+
+ obj = ctx->TransformFeedback.CurrentObject;
+
+ if (!obj->Active || !obj->Paused) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glPauseTransformFeedback(feedback not active or not paused)");
+ return;
+ }
+
+ obj->Paused = GL_FALSE;
+
+ assert(ctx->Driver.ResumeTransformFeedback);
+ ctx->Driver.ResumeTransformFeedback(ctx, obj);
+}
+
+
+/**
+ * Draw the vertex data in a transform feedback object.
+ * \param mode GL_POINTS, GL_LINES, GL_TRIANGLE_STRIP, etc.
+ * \param name the transform feedback object
+ * The number of vertices comes from the transform feedback object.
+ * User still has to setup of the vertex attribute info with
+ * glVertexPointer, glColorPointer, etc.
+ * Part of GL_ARB_transform_feedback2.
+ */
+void GLAPIENTRY
+_mesa_DrawTransformFeedback(GLenum mode, GLuint name)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_transform_feedback_object *obj =
+ lookup_transform_feedback_object(ctx, name);
+
+ if (mode > GL_POLYGON) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glDrawTransformFeedback(mode=0x%x)", mode);
+ return;
+ }
+ if (!obj) {
+ _mesa_error(ctx, GL_INVALID_VALUE,
+ "glDrawTransformFeedback(name = %u)", name);
+ return;
+ }
+
+ /* XXX check if EndTransformFeedback has never been called while
+ * the object was bound
+ */
+
+ assert(ctx->Driver.DrawTransformFeedback);
+ ctx->Driver.DrawTransformFeedback(ctx, mode, obj);
+}
+
+
+/*
+XXX misc to do:
+
+glGet*() for
+
+GL_TRANSFORM_FEEDBACK_BUFFER_PAUSED
+GL_TRANSFORM_FEEDBACK_BUFFER_ACTIVE
+GL_TRANSFORM_FEEDBACK_BINDING
+*/
+
+
+#endif /* FEATURE_EXT_transform_feedback */