/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2007 Brian Paul 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.
*/
#include <stdbool.h>
#include "glheader.h"
#include "api_validate.h"
#include "bufferobj.h"
#include "context.h"
#include "imports.h"
#include "mtypes.h"
#include "enums.h"
#include "vbo/vbo.h"
#include "transformfeedback.h"
#include <stdbool.h>
/**
* Check if OK to draw arrays/elements.
*/
static bool
check_valid_to_render(struct gl_context *ctx, const char *function)
{
if (!_mesa_valid_to_render(ctx, function)) {
return false;
}
switch (ctx->API) {
case API_OPENGLES2:
/* For ES2, we can draw if we have a vertex program/shader). */
return ctx->VertexProgram._Current != NULL;
case API_OPENGLES:
/* For OpenGL ES, only draw if we have vertex positions
*/
if (!ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_POS].Enabled)
return false;
break;
case API_OPENGL_CORE:
/* Section 10.4 (Drawing Commands Using Vertex Arrays) of the OpenGL 4.5
* Core Profile spec says:
*
* "An INVALID_OPERATION error is generated if no vertex array
* object is bound (see section 10.3.1)."
*/
if (ctx->Array.VAO == ctx->Array.DefaultVAO) {
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(no VAO bound)", function);
return false;
}
/* Section 7.3 (Program Objects) of the OpenGL 4.5 Core Profile spec
* says:
*
* "If there is no active program for the vertex or fragment shader
* stages, the results of vertex and/or fragment processing will be
* undefined. However, this is not an error."
*
* The fragment shader is not tested here because other state (e.g.,
* GL_RASTERIZER_DISCARD) affects whether or not we actually care.
*/
return ctx->VertexProgram._Current != NULL;
case API_OPENGL_COMPAT:
if (ctx->VertexProgram._Current != NULL) {
/* Draw regardless of whether or not we have any vertex arrays.
* (Ex: could draw a point using a constant vertex pos)
*/
return true;
} else {
/* Draw if we have vertex positions (GL_VERTEX_ARRAY or generic
* array [0]).
*/
return (ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_POS].Enabled ||
ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_GENERIC0].Enabled);
}
break;
default:
unreachable("Invalid API value in check_valid_to_render()");
}
return true;
}
/**
* Is 'mode' a valid value for glBegin(), glDrawArrays(), glDrawElements(),
* etc? The set of legal values depends on whether geometry shaders/programs
* are supported.
* Note: This may be called during display list compilation.
*/
bool
_mesa_is_valid_prim_mode(struct gl_context *ctx, GLenum mode)
{
/* The overwhelmingly common case is (mode <= GL_TRIANGLE_FAN). Test that
* first and exit. You would think that a switch-statement would be the
* right approach, but at least GCC 4.7.2 generates some pretty dire code
* for the common case.
*/
if (likely(mode <= GL_TRIANGLE_FAN))
return true;
if (mode <= GL_POLYGON)
return (ctx->API == API_OPENGL_COMPAT);
if (mode <= GL_TRIANGLE_STRIP_ADJACENCY)
return _mesa_has_geometry_shaders(ctx);
return false;
}
/**
* Is 'mode' a valid value for glBegin(), glDrawArrays(), glDrawElements(),
* etc? Also, do additional checking related to transformation feedback.
* Note: this function cannot be called during glNewList(GL_COMPILE) because
* this code depends on current transform feedback state.
*/
GLboolean
_mesa_valid_prim_mode(struct gl_context *ctx, GLenum mode, const char *name)
{
bool valid_enum = _mesa_is_valid_prim_mode(ctx, mode);
if (!valid_enum) {
_mesa_error(ctx, GL_INVALID_ENUM, "%s(mode=%x)", name, mode);
return GL_FALSE;
}
/* From the ARB_geometry_shader4 spec:
*
* The error INVALID_OPERATION is generated if Begin, or any command that
* implicitly calls Begin, is called when a geometry shader is active and:
*
* * the input primitive type of the current geometry shader is
* POINTS and <mode> is not POINTS,
*
* * the input primitive type of the current geometry shader is
* LINES and <mode> is not LINES, LINE_STRIP, or LINE_LOOP,
*
* * the input primitive type of the current geometry shader is
* TRIANGLES and <mode> is not TRIANGLES, TRIANGLE_STRIP or
* TRIANGLE_FAN,
*
* * the input primitive type of the current geometry shader is
* LINES_ADJACENCY_ARB and <mode> is not LINES_ADJACENCY_ARB or
* LINE_STRIP_ADJACENCY_ARB, or
*
* * the input primitive type of the current geometry shader is
* TRIANGLES_ADJACENCY_ARB and <mode> is not
* TRIANGLES_ADJACENCY_ARB or TRIANGLE_STRIP_ADJACENCY_ARB.
*
*/
if (ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY]) {
const GLenum geom_mode =
ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY]->Geom.InputType;
switch (mode) {
case GL_POINTS:
valid_enum = (geom_mode == GL_POINTS);
break;
case GL_LINES:
case GL_LINE_LOOP:
case GL_LINE_STRIP:
valid_enum = (geom_mode == GL_LINES);
break;
case GL_TRIANGLES:
case GL_TRIANGLE_STRIP:
case GL_TRIANGLE_FAN:
valid_enum = (geom_mode == GL_TRIANGLES);
break;
case GL_QUADS:
case GL_QUAD_STRIP:
case GL_POLYGON:
valid_enum = false;
break;
case GL_LINES_ADJACENCY:
case GL_LINE_STRIP_ADJACENCY:
valid_enum = (geom_mode == GL_LINES_ADJACENCY);
break;
case GL_TRIANGLES_ADJACENCY:
case GL_TRIANGLE_STRIP_ADJACENCY:
valid_enum = (geom_mode == GL_TRIANGLES_ADJACENCY);
break;
default:
valid_enum = false;
break;
}
if (!valid_enum) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(mode=%s vs geometry shader input %s)",
name,
_mesa_lookup_prim_by_nr(mode),
_mesa_lookup_prim_by_nr(geom_mode));
return GL_FALSE;
}
}
/* From the GL_EXT_transform_feedback spec:
*
* "The error INVALID_OPERATION is generated if Begin, or any command
* that performs an explicit Begin, is called when:
*
* * a geometry shader is not active and <mode> does not match the
* allowed begin modes for the current transform feedback state as
* given by table X.1.
*
* * a geometry shader is active and the output primitive type of the
* geometry shader does not match the allowed begin modes for the
* current transform feedback state as given by table X.1.
*
*/
if (_mesa_is_xfb_active_and_unpaused(ctx)) {
GLboolean pass = GL_TRUE;
if(ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY]) {
switch (ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY]->Geom.OutputType) {
case GL_POINTS:
pass = ctx->TransformFeedback.Mode == GL_POINTS;
break;
case GL_LINE_STRIP:
pass = ctx->TransformFeedback.Mode == GL_LINES;
break;
case GL_TRIANGLE_STRIP:
pass = ctx->TransformFeedback.Mode == GL_TRIANGLES;
break;
default:
pass = GL_FALSE;
}
}
else {
switch (mode) {
case GL_POINTS:
pass = ctx->TransformFeedback.Mode == GL_POINTS;
break;
case GL_LINES:
case GL_LINE_STRIP:
case GL_LINE_LOOP:
pass = ctx->TransformFeedback.Mode == GL_LINES;
break;
default:
pass = ctx->TransformFeedback.Mode == GL_TRIANGLES;
break;
}
}
if (!pass) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(mode=%s vs transform feedback %s)",
name,
_mesa_lookup_prim_by_nr(mode),
_mesa_lookup_prim_by_nr(ctx->TransformFeedback.Mode));
return GL_FALSE;
}
}
return GL_TRUE;
}
/**
* Verify that the element type is valid.
*
* Generates \c GL_INVALID_ENUM and returns \c false if it is not.
*/
static bool
valid_elements_type(struct gl_context *ctx, GLenum type, const char *name)
{
switch (type) {
case GL_UNSIGNED_BYTE:
case GL_UNSIGNED_SHORT:
case GL_UNSIGNED_INT:
return true;
default:
_mesa_error(ctx, GL_INVALID_ENUM, "%s(type = %s)", name,
_mesa_lookup_enum_by_nr(type));
return false;
}
}
static bool
validate_DrawElements_common(struct gl_context *ctx,
GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices,
const char *caller)
{
/* From the GLES3 specification, section 2.14.2 (Transform Feedback
* Primitive Capture):
*
* The error INVALID_OPERATION is also generated by DrawElements,
* DrawElementsInstanced, and DrawRangeElements while transform feedback
* is active and not paused, regardless of mode.
*/
if (_mesa_is_gles3(ctx) && _mesa_is_xfb_active_and_unpaused(ctx)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(transform feedback active)", caller);
return false;
}
if (count < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(count)", caller);
return false;
}
if (!_mesa_valid_prim_mode(ctx, mode, caller)) {
return false;
}
if (!valid_elements_type(ctx, type, caller))
return false;
if (!check_valid_to_render(ctx, caller))
return false;
/* Not using a VBO for indices, so avoid NULL pointer derefs later.
*/
if (!_mesa_is_bufferobj(ctx->Array.VAO->IndexBufferObj) && indices == NULL)
return false;
if (count == 0)
return false;
return true;
}
/**
* Error checking for glDrawElements(). Includes parameter checking
* and VBO bounds checking.
* \return GL_TRUE if OK to render, GL_FALSE if error found
*/
GLboolean
_mesa_validate_DrawElements(struct gl_context *ctx,
GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices)
{
FLUSH_CURRENT(ctx, 0);
return validate_DrawElements_common(ctx, mode, count, type, indices,
"glDrawElements");
}
/**
* Error checking for glMultiDrawElements(). Includes parameter checking
* and VBO bounds checking.
* \return GL_TRUE if OK to render, GL_FALSE if error found
*/
GLboolean
_mesa_validate_MultiDrawElements(struct gl_context *ctx,
GLenum mode, const GLsizei *count,
GLenum type, const GLvoid * const *indices,
GLuint primcount)
{
unsigned i;
FLUSH_CURRENT(ctx, 0);
for (i = 0; i < primcount; i++) {
if (count[i] < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glMultiDrawElements(count)" );
return GL_FALSE;
}
}
if (!_mesa_valid_prim_mode(ctx, mode, "glMultiDrawElements")) {
return GL_FALSE;
}
if (!valid_elements_type(ctx, type, "glMultiDrawElements"))
return GL_FALSE;
if (!check_valid_to_render(ctx, "glMultiDrawElements"))
return GL_FALSE;
/* Not using a VBO for indices, so avoid NULL pointer derefs later.
*/
if (!_mesa_is_bufferobj(ctx->Array.VAO->IndexBufferObj)) {
for (i = 0; i < primcount; i++) {
if (!indices[i])
return GL_FALSE;
}
}
return GL_TRUE;
}
/**
* Error checking for glDrawRangeElements(). Includes parameter checking
* and VBO bounds checking.
* \return GL_TRUE if OK to render, GL_FALSE if error found
*/
GLboolean
_mesa_validate_DrawRangeElements(struct gl_context *ctx, GLenum mode,
GLuint start, GLuint end,
GLsizei count, GLenum type,
const GLvoid *indices)
{
FLUSH_CURRENT(ctx, 0);
if (end < start) {
_mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
return GL_FALSE;
}
return validate_DrawElements_common(ctx, mode, count, type, indices,
"glDrawRangeElements");
}
/**
* Called from the tnl module to error check the function parameters and
* verify that we really can draw something.
* \return GL_TRUE if OK to render, GL_FALSE if error found
*/
GLboolean
_mesa_validate_DrawArrays(struct gl_context *ctx, GLenum mode, GLsizei count)
{
struct gl_transform_feedback_object *xfb_obj
= ctx->TransformFeedback.CurrentObject;
FLUSH_CURRENT(ctx, 0);
if (count < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
return GL_FALSE;
}
if (!_mesa_valid_prim_mode(ctx, mode, "glDrawArrays")) {
return GL_FALSE;
}
if (!check_valid_to_render(ctx, "glDrawArrays"))
return GL_FALSE;
/* From the GLES3 specification, section 2.14.2 (Transform Feedback
* Primitive Capture):
*
* The error INVALID_OPERATION is generated by DrawArrays and
* DrawArraysInstanced if recording the vertices of a primitive to the
* buffer objects being used for transform feedback purposes would result
* in either exceeding the limits of any buffer object’s size, or in
* exceeding the end position offset + size − 1, as set by
* BindBufferRange.
*
* This is in contrast to the behaviour of desktop GL, where the extra
* primitives are silently dropped from the transform feedback buffer.
*/
if (_mesa_is_gles3(ctx) && _mesa_is_xfb_active_and_unpaused(ctx)) {
size_t prim_count = vbo_count_tessellated_primitives(mode, count, 1);
if (xfb_obj->GlesRemainingPrims < prim_count) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glDrawArrays(exceeds transform feedback size)");
return GL_FALSE;
}
xfb_obj->GlesRemainingPrims -= prim_count;
}
if (count == 0)
return GL_FALSE;
return GL_TRUE;
}
GLboolean
_mesa_validate_DrawArraysInstanced(struct gl_context *ctx, GLenum mode, GLint first,
GLsizei count, GLsizei numInstances)
{
struct gl_transform_feedback_object *xfb_obj
= ctx->TransformFeedback.CurrentObject;
FLUSH_CURRENT(ctx, 0);
if (count < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawArraysInstanced(count=%d)", count);
return GL_FALSE;
}
if (first < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawArraysInstanced(start=%d)", first);
return GL_FALSE;
}
if (!_mesa_valid_prim_mode(ctx, mode, "glDrawArraysInstanced")) {
return GL_FALSE;
}
if (numInstances <= 0) {
if (numInstances < 0)
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawArraysInstanced(numInstances=%d)", numInstances);
return GL_FALSE;
}
if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)"))
return GL_FALSE;
/* From the GLES3 specification, section 2.14.2 (Transform Feedback
* Primitive Capture):
*
* The error INVALID_OPERATION is generated by DrawArrays and
* DrawArraysInstanced if recording the vertices of a primitive to the
* buffer objects being used for transform feedback purposes would result
* in either exceeding the limits of any buffer object’s size, or in
* exceeding the end position offset + size − 1, as set by
* BindBufferRange.
*
* This is in contrast to the behaviour of desktop GL, where the extra
* primitives are silently dropped from the transform feedback buffer.
*/
if (_mesa_is_gles3(ctx) && _mesa_is_xfb_active_and_unpaused(ctx)) {
size_t prim_count
= vbo_count_tessellated_primitives(mode, count, numInstances);
if (xfb_obj->GlesRemainingPrims < prim_count) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glDrawArraysInstanced(exceeds transform feedback size)");
return GL_FALSE;
}
xfb_obj->GlesRemainingPrims -= prim_count;
}
if (count == 0)
return GL_FALSE;
return GL_TRUE;
}
GLboolean
_mesa_validate_DrawElementsInstanced(struct gl_context *ctx,
GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices, GLsizei numInstances)
{
FLUSH_CURRENT(ctx, 0);
if (numInstances < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawElementsInstanced(numInstances=%d)", numInstances);
return GL_FALSE;
}
return validate_DrawElements_common(ctx, mode, count, type, indices,
"glDrawElementsInstanced")
&& (numInstances > 0);
}
GLboolean
_mesa_validate_DrawTransformFeedback(struct gl_context *ctx,
GLenum mode,
struct gl_transform_feedback_object *obj,
GLuint stream,
GLsizei numInstances)
{
FLUSH_CURRENT(ctx, 0);
if (!_mesa_valid_prim_mode(ctx, mode, "glDrawTransformFeedback*(mode)")) {
return GL_FALSE;
}
if (!obj) {
_mesa_error(ctx, GL_INVALID_VALUE, "glDrawTransformFeedback*(name)");
return GL_FALSE;
}
if (stream >= ctx->Const.MaxVertexStreams) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawTransformFeedbackStream*(index>=MaxVertexStream)");
return GL_FALSE;
}
if (!obj->EndedAnytime) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glDrawTransformFeedback*");
return GL_FALSE;
}
if (numInstances <= 0) {
if (numInstances < 0)
_mesa_error(ctx, GL_INVALID_VALUE,
"glDrawTransformFeedback*Instanced(numInstances=%d)",
numInstances);
return GL_FALSE;
}
if (!check_valid_to_render(ctx, "glDrawTransformFeedback*")) {
return GL_FALSE;
}
return GL_TRUE;
}
static GLboolean
valid_draw_indirect(struct gl_context *ctx,
GLenum mode, const GLvoid *indirect,
GLsizei size, const char *name)
{
const GLsizeiptr end = (GLsizeiptr)indirect + size;
if (!_mesa_valid_prim_mode(ctx, mode, name))
return GL_FALSE;
/* From the ARB_draw_indirect specification:
* "An INVALID_OPERATION error is generated [...] if <indirect> is no
* word aligned."
*/
if ((GLsizeiptr)indirect & (sizeof(GLuint) - 1)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(indirect is not aligned)", name);
return GL_FALSE;
}
if (!_mesa_is_bufferobj(ctx->DrawIndirectBuffer)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s: no buffer bound to DRAW_INDIRECT_BUFFER", name);
return GL_FALSE;
}
if (_mesa_check_disallowed_mapping(ctx->DrawIndirectBuffer)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(DRAW_INDIRECT_BUFFER is mapped)", name);
return GL_FALSE;
}
/* From the ARB_draw_indirect specification:
* "An INVALID_OPERATION error is generated if the commands source data
* beyond the end of the buffer object [...]"
*/
if (ctx->DrawIndirectBuffer->Size < end) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(DRAW_INDIRECT_BUFFER too small)", name);
return GL_FALSE;
}
if (!check_valid_to_render(ctx, name))
return GL_FALSE;
return GL_TRUE;
}
static inline GLboolean
valid_draw_indirect_elements(struct gl_context *ctx,
GLenum mode, GLenum type, const GLvoid *indirect,
GLsizeiptr size, const char *name)
{
if (!valid_elements_type(ctx, type, name))
return GL_FALSE;
/*
* Unlike regular DrawElementsInstancedBaseVertex commands, the indices
* may not come from a client array and must come from an index buffer.
* If no element array buffer is bound, an INVALID_OPERATION error is
* generated.
*/
if (!_mesa_is_bufferobj(ctx->Array.VAO->IndexBufferObj)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(no buffer bound to GL_ELEMENT_ARRAY_BUFFER)", name);
return GL_FALSE;
}
return valid_draw_indirect(ctx, mode, indirect, size, name);
}
static inline GLboolean
valid_draw_indirect_multi(struct gl_context *ctx,
GLsizei primcount, GLsizei stride,
const char *name)
{
/* From the ARB_multi_draw_indirect specification:
* "INVALID_VALUE is generated by MultiDrawArraysIndirect or
* MultiDrawElementsIndirect if <primcount> is negative."
*
* "<primcount> must be positive, otherwise an INVALID_VALUE error will
* be generated."
*/
if (primcount < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(primcount < 0)", name);
return GL_FALSE;
}
/* From the ARB_multi_draw_indirect specification:
* "<stride> must be a multiple of four, otherwise an INVALID_VALUE
* error is generated."
*/
if (stride % 4) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(stride %% 4)", name);
return GL_FALSE;
}
return GL_TRUE;
}
GLboolean
_mesa_validate_DrawArraysIndirect(struct gl_context *ctx,
GLenum mode,
const GLvoid *indirect)
{
const unsigned drawArraysNumParams = 4;
FLUSH_CURRENT(ctx, 0);
return valid_draw_indirect(ctx, mode,
indirect, drawArraysNumParams * sizeof(GLuint),
"glDrawArraysIndirect");
}
GLboolean
_mesa_validate_DrawElementsIndirect(struct gl_context *ctx,
GLenum mode, GLenum type,
const GLvoid *indirect)
{
const unsigned drawElementsNumParams = 5;
FLUSH_CURRENT(ctx, 0);
return valid_draw_indirect_elements(ctx, mode, type,
indirect, drawElementsNumParams * sizeof(GLuint),
"glDrawElementsIndirect");
}
GLboolean
_mesa_validate_MultiDrawArraysIndirect(struct gl_context *ctx,
GLenum mode,
const GLvoid *indirect,
GLsizei primcount, GLsizei stride)
{
GLsizeiptr size = 0;
const unsigned drawArraysNumParams = 4;
FLUSH_CURRENT(ctx, 0);
/* caller has converted stride==0 to drawArraysNumParams * sizeof(GLuint) */
assert(stride != 0);
if (!valid_draw_indirect_multi(ctx, primcount, stride,
"glMultiDrawArraysIndirect"))
return GL_FALSE;
/* number of bytes of the indirect buffer which will be read */
size = primcount
? (primcount - 1) * stride + drawArraysNumParams * sizeof(GLuint)
: 0;
if (!valid_draw_indirect(ctx, mode, indirect, size,
"glMultiDrawArraysIndirect"))
return GL_FALSE;
return GL_TRUE;
}
GLboolean
_mesa_validate_MultiDrawElementsIndirect(struct gl_context *ctx,
GLenum mode, GLenum type,
const GLvoid *indirect,
GLsizei primcount, GLsizei stride)
{
GLsizeiptr size = 0;
const unsigned drawElementsNumParams = 5;
FLUSH_CURRENT(ctx, 0);
/* caller has converted stride==0 to drawElementsNumParams * sizeof(GLuint) */
assert(stride != 0);
if (!valid_draw_indirect_multi(ctx, primcount, stride,
"glMultiDrawElementsIndirect"))
return GL_FALSE;
/* number of bytes of the indirect buffer which will be read */
size = primcount
? (primcount - 1) * stride + drawElementsNumParams * sizeof(GLuint)
: 0;
if (!valid_draw_indirect_elements(ctx, mode, type,
indirect, size,
"glMultiDrawElementsIndirect"))
return GL_FALSE;
return GL_TRUE;
}