/* * 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 OR COPYRIGHT HOLDERS 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 "macros.h" #include "mtypes.h" #include "transformfeedback.h" #include "shaderapi.h" #include "shaderobj.h" #include "main/dispatch.h" #include "program/prog_parameter.h" struct using_program_tuple { struct gl_shader_program *shProg; bool found; }; static void active_xfb_object_references_program(GLuint key, void *data, void *user_data) { struct using_program_tuple *callback_data = user_data; struct gl_transform_feedback_object *obj = data; if (obj->Active && obj->shader_program == callback_data->shProg) callback_data->found = true; } /** * Return true if any active transform feedback object is using a program. */ bool _mesa_transform_feedback_is_using_program(struct gl_context *ctx, struct gl_shader_program *shProg) { struct using_program_tuple callback_data; callback_data.shProg = shProg; callback_data.found = false; _mesa_HashWalk(ctx->TransformFeedback.Objects, active_xfb_object_references_program, &callback_data); /* Also check DefaultObject, as it's not in the Objects hash table. */ active_xfb_object_references_program(0, ctx->TransformFeedback.DefaultObject, &callback_data); return callback_data.found; } /** * 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++; obj->EverBound = GL_TRUE; *ptr = obj; } } } /** * 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; } /** Initialize the fields of a gl_transform_feedback_object. */ void _mesa_init_transform_feedback_object(struct gl_transform_feedback_object *obj, GLuint name) { if (!obj) return; obj->Name = name; obj->RefCount = 1; obj->EverBound = GL_FALSE; } /** 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); _mesa_init_transform_feedback_object(obj, name); 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->Label); free(obj); } /** 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 */ } /** * 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; } /** * Fill in the correct Size value for each buffer in \c obj. * * From the GL 4.3 spec, section 6.1.1 ("Binding Buffer Objects to Indexed * Targets"): * * BindBufferBase binds the entire buffer, even when the size of the buffer * is changed after the binding is established. It is equivalent to calling * BindBufferRange with offset zero, while size is determined by the size of * the bound buffer at the time the binding is used. * * Regardless of the size specified with BindBufferRange, or indirectly with * BindBufferBase, the GL will never read or write beyond the end of a bound * buffer. In some cases this constraint may result in visibly different * behavior when a buffer overflow would otherwise result, such as described * for transform feedback operations in section 13.2.2. */ static void compute_transform_feedback_buffer_sizes( struct gl_transform_feedback_object *obj) { unsigned i = 0; for (i = 0; i < MAX_FEEDBACK_BUFFERS; ++i) { GLintptr offset = obj->Offset[i]; GLsizeiptr buffer_size = obj->Buffers[i] == NULL ? 0 : obj->Buffers[i]->Size; GLsizeiptr available_space = buffer_size <= offset ? 0 : buffer_size - offset; GLsizeiptr computed_size; if (obj->RequestedSize[i] == 0) { /* No size was specified at the time the buffer was bound, so allow * writing to all available space in the buffer. */ computed_size = available_space; } else { /* A size was specified at the time the buffer was bound, however * it's possible that the buffer has shrunk since then. So only * allow writing to the minimum of the specified size and the space * available. */ computed_size = MIN2(available_space, obj->RequestedSize[i]); } /* Legal sizes must be multiples of four, so round down if necessary. */ obj->Size[i] = computed_size & ~0x3; } } /** * Compute the maximum number of vertices that can be written to the currently * enabled transform feedback buffers without overflowing any of them. */ unsigned _mesa_compute_max_transform_feedback_vertices( const struct gl_transform_feedback_object *obj, const struct gl_transform_feedback_info *info) { unsigned max_index = 0xffffffff; unsigned i; for (i = 0; i < info->NumBuffers; ++i) { unsigned stride = info->BufferStride[i]; unsigned max_for_this_buffer; /* Skip any inactive buffers, which have a stride of 0. */ if (stride == 0) continue; max_for_this_buffer = obj->Size[i] / (4 * stride); max_index = MIN2(max_index, max_for_this_buffer); } return max_index; } /** ** Begin API functions **/ void GLAPIENTRY _mesa_BeginTransformFeedback(GLenum mode) { struct gl_transform_feedback_object *obj; struct gl_transform_feedback_info *info; GLuint i; unsigned vertices_per_prim; GET_CURRENT_CONTEXT(ctx); obj = ctx->TransformFeedback.CurrentObject; if (ctx->Shader.CurrentProgram[MESA_SHADER_VERTEX] == NULL) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginTransformFeedback(no program active)"); return; } info = &ctx->Shader.CurrentProgram[MESA_SHADER_VERTEX]->LinkedTransformFeedback; if (info->NumOutputs == 0) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginTransformFeedback(no varyings to record)"); return; } switch (mode) { case GL_POINTS: vertices_per_prim = 1; break; case GL_LINES: vertices_per_prim = 2; break; case GL_TRIANGLES: vertices_per_prim = 3; break; default: _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)"); return; } if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginTransformFeedback(already active)"); return; } for (i = 0; i < info->NumBuffers; ++i) { if (obj->BufferNames[i] == 0) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginTransformFeedback(binding point %d does not have " "a buffer object bound)", i); return; } } FLUSH_VERTICES(ctx, 0); ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback; obj->Active = GL_TRUE; ctx->TransformFeedback.Mode = mode; compute_transform_feedback_buffer_sizes(obj); if (_mesa_is_gles3(ctx)) { /* In GLES3, we are required to track the usage of the transform * feedback buffer and report INVALID_OPERATION if a draw call tries to * exceed it. So compute the maximum number of vertices that we can * write without overflowing any of the buffers currently being used for * feedback. */ unsigned max_vertices = _mesa_compute_max_transform_feedback_vertices(obj, info); obj->GlesRemainingPrims = max_vertices / vertices_per_prim; } obj->shader_program = ctx->Shader.CurrentProgram[MESA_SHADER_VERTEX]; 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; } FLUSH_VERTICES(ctx, 0); ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback; ctx->TransformFeedback.CurrentObject->Active = GL_FALSE; ctx->TransformFeedback.CurrentObject->Paused = GL_FALSE; ctx->TransformFeedback.CurrentObject->EndedAnytime = GL_TRUE; 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; /* Note: no need to FLUSH_VERTICES or flag NewTransformFeedback, because * transform feedback buffers can't be changed while transform feedback is * active. */ /* 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->RequestedSize[index] = size; } /** * Specify a buffer object to receive vertex shader results. Plus, * specify the starting offset to place the results, and max size. * Called from the glBindBufferRange() function. */ void _mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx, GLuint index, struct gl_buffer_object *bufObj, GLintptr offset, GLsizeiptr size) { struct gl_transform_feedback_object *obj; obj = ctx->TransformFeedback.CurrentObject; if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferRange(transform feedback active)"); return; } if (index >= ctx->Const.MaxTransformFeedbackBuffers) { _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferRange(index=%d)", index); return; } if (size & 0x3) { /* must a 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; } bind_buffer_range(ctx, index, bufObj, offset, size); } /** * Specify a buffer object to receive vertex shader results. * As above, but start at offset = 0. * Called from the glBindBufferBase() function. */ void _mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx, GLuint index, struct gl_buffer_object *bufObj) { struct gl_transform_feedback_object *obj; obj = ctx->TransformFeedback.CurrentObject; if (obj->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferBase(transform feedback active)"); return; } if (index >= ctx->Const.MaxTransformFeedbackBuffers) { _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferBase(index=%d)", index); return; } bind_buffer_range(ctx, index, bufObj, 0, 0); } /** * 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); 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, "glBindBufferOffsetEXT(transform feedback active)"); return; } if (index >= ctx->Const.MaxTransformFeedbackBuffers) { _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferOffsetEXT(index=%d)", index); return; } if (offset & 0x3) { /* must be multiple of four */ _mesa_error(ctx, GL_INVALID_VALUE, "glBindBufferOffsetEXT(offset=%d)", (int) offset); return; } if (buffer == 0) { bufObj = ctx->Shared->NullBufferObj; } else { bufObj = _mesa_lookup_bufferobj(ctx, buffer); } if (!bufObj) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindBufferOffsetEXT(invalid buffer=%u)", buffer); return; } bind_buffer_range(ctx, index, bufObj, offset, 0); } /** * 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 * const *varyings, GLenum bufferMode) { struct gl_shader_program *shProg; GLint i; GET_CURRENT_CONTEXT(ctx); /* From the ARB_transform_feedback2 specification: * "The error INVALID_OPERATION is generated by TransformFeedbackVaryings * if the current transform feedback object is active, even if paused." */ if (ctx->TransformFeedback.CurrentObject->Active) { _mesa_error(ctx, GL_INVALID_OPERATION, "glTransformFeedbackVaryings(current object is active)"); return; } 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 || (bufferMode == GL_SEPARATE_ATTRIBS && (GLuint) count > ctx->Const.MaxTransformFeedbackBuffers)) { _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; } if (ctx->Extensions.ARB_transform_feedback3) { if (bufferMode == GL_INTERLEAVED_ATTRIBS) { unsigned buffers = 1; for (i = 0; i < count; i++) { if (strcmp(varyings[i], "gl_NextBuffer") == 0) buffers++; } if (buffers > ctx->Const.MaxTransformFeedbackBuffers) { _mesa_error(ctx, GL_INVALID_OPERATION, "glTransformFeedbackVaryings(too many gl_NextBuffer " "occurences)"); return; } } else { for (i = 0; i < count; i++) { if (strcmp(varyings[i], "gl_NextBuffer") == 0 || strcmp(varyings[i], "gl_SkipComponents1") == 0 || strcmp(varyings[i], "gl_SkipComponents2") == 0 || strcmp(varyings[i], "gl_SkipComponents3") == 0 || strcmp(varyings[i], "gl_SkipComponents4") == 0) { _mesa_error(ctx, GL_INVALID_OPERATION, "glTransformFeedbackVaryings(SEPARATE_ATTRIBS," "varying=%s)", varyings[i]); return; } } } } /* free existing varyings, if any */ for (i = 0; i < (GLint) shProg->TransformFeedback.NumVarying; i++) { free(shProg->TransformFeedback.VaryingNames[i]); } free(shProg->TransformFeedback.VaryingNames); /* allocate new memory for varying names */ shProg->TransformFeedback.VaryingNames = 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 < count; i++) { shProg->TransformFeedback.VaryingNames[i] = _mesa_strdup(varyings[i]); } shProg->TransformFeedback.NumVarying = count; shProg->TransformFeedback.BufferMode = bufferMode; /* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since * 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 struct gl_transform_feedback_info *linked_xfb_info; GET_CURRENT_CONTEXT(ctx); shProg = _mesa_lookup_shader_program(ctx, program); if (!shProg) { _mesa_error(ctx, GL_INVALID_VALUE, "glGetTransformFeedbackVarying(program=%u)", program); return; } linked_xfb_info = &shProg->LinkedTransformFeedback; if (index >= (GLuint) linked_xfb_info->NumVarying) { _mesa_error(ctx, GL_INVALID_VALUE, "glGetTransformFeedbackVarying(index=%u)", index); return; } /* return the varying's name and length */ _mesa_copy_string(name, bufSize, length, linked_xfb_info->Varyings[index].Name); /* return the datatype and value's size (in datatype units) */ if (type) *type = linked_xfb_info->Varyings[index].Type; if (size) *size = linked_xfb_info->Varyings[index].Size; } struct gl_transform_feedback_object * _mesa_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); 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) { struct gl_transform_feedback_object *obj; GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE); if (name == 0) return GL_FALSE; obj = _mesa_lookup_transform_feedback_object(ctx, name); if (obj == NULL) return GL_FALSE; return obj->EverBound; } /** * 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 (_mesa_is_xfb_active_and_unpaused(ctx)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glBindTransformFeedback(transform is active, or not paused)"); return; } obj = _mesa_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); 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 = _mesa_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 (!_mesa_is_xfb_active_and_unpaused(ctx)) { _mesa_error(ctx, GL_INVALID_OPERATION, "glPauseTransformFeedback(feedback not active or already paused)"); return; } FLUSH_VERTICES(ctx, 0); ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback; 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, "glResumeTransformFeedback(feedback not active or not paused)"); return; } /* From the ARB_transform_feedback2 specification: * "The error INVALID_OPERATION is generated by ResumeTransformFeedback if * the program object being used by the current transform feedback object * is not active." */ if (obj->shader_program != ctx->Shader.CurrentProgram[MESA_SHADER_VERTEX]) { _mesa_error(ctx, GL_INVALID_OPERATION, "glResumeTransformFeedback(wrong vertex program bound)"); return; } FLUSH_VERTICES(ctx, 0); ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback; obj->Paused = GL_FALSE; assert(ctx->Driver.ResumeTransformFeedback); ctx->Driver.ResumeTransformFeedback(ctx, obj); }