diff options
Diffstat (limited to 'mesalib/src/mesa/main/transformfeedback.c')
| -rw-r--r-- | mesalib/src/mesa/main/transformfeedback.c | 1888 |
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 */
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