/*
* 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"
/**
* 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;
}
/** 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;
obj->EverBound = GL_FALSE;
}
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);
}
}
/** 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.CurrentVertexProgram == NULL) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBeginTransformFeedback(no program active)");
return;
}
info = &ctx->Shader.CurrentVertexProgram->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;
}
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);
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;
}
FLUSH_VERTICES(ctx, 0);
ctx->NewDriverState |= ctx->DriverFlags.NewTransformFeedback;
obj->Paused = GL_FALSE;
assert(ctx
->Driver.
ResumeTransformFeedback);
ctx->Driver.ResumeTransformFeedback(ctx, obj);
}