diff options
Diffstat (limited to 'mesalib/src/mesa/main/transformfeedback.c')
| -rw-r--r-- | mesalib/src/mesa/main/transformfeedback.c | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/transformfeedback.c b/mesalib/src/mesa/main/transformfeedback.c new file mode 100644 index 000000000..5c8c1fd22 --- /dev/null +++ b/mesalib/src/mesa/main/transformfeedback.c @@ -0,0 +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 */ |