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238 lines
6.9 KiB
C
238 lines
6.9 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.1
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*
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* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "glheader.h"
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#include "api_validate.h"
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#include "context.h"
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#include "imports.h"
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#include "mtypes.h"
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#include "state.h"
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GLboolean
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_mesa_validate_DrawElements(GLcontext *ctx,
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GLenum mode, GLsizei count, GLenum type,
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const GLvoid *indices)
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{
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ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
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if (count <= 0) {
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if (count < 0)
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_mesa_error(ctx, GL_INVALID_VALUE, "glDrawElements(count)" );
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return GL_FALSE;
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}
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if (mode > GL_POLYGON) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(mode)" );
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return GL_FALSE;
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}
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if (type != GL_UNSIGNED_INT &&
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type != GL_UNSIGNED_BYTE &&
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type != GL_UNSIGNED_SHORT)
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{
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_mesa_error(ctx, GL_INVALID_ENUM, "glDrawElements(type)" );
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return GL_FALSE;
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}
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if (ctx->NewState)
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_mesa_update_state(ctx);
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/* Always need vertex positions */
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if (!ctx->Array.Vertex.Enabled
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&& !(ctx->VertexProgram._Enabled && ctx->Array.VertexAttrib[0].Enabled))
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return GL_FALSE;
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/* Vertex buffer object tests */
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if (ctx->Array.ElementArrayBufferObj->Name) {
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GLuint indexBytes;
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/* use indices in the buffer object */
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if (!ctx->Array.ElementArrayBufferObj->Data) {
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_mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
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return GL_FALSE;
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}
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/* make sure count doesn't go outside buffer bounds */
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if (type == GL_UNSIGNED_INT) {
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indexBytes = count * sizeof(GLuint);
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}
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else if (type == GL_UNSIGNED_BYTE) {
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indexBytes = count * sizeof(GLubyte);
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}
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else {
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ASSERT(type == GL_UNSIGNED_SHORT);
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indexBytes = count * sizeof(GLushort);
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}
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if ((GLubyte *) indices + indexBytes >
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ctx->Array.ElementArrayBufferObj->Data +
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ctx->Array.ElementArrayBufferObj->Size) {
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_mesa_warning(ctx, "glDrawElements index out of buffer bounds");
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return GL_FALSE;
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}
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/* Actual address is the sum of pointers. Indices may be used below. */
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if (ctx->Const.CheckArrayBounds) {
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indices = (const GLvoid *)
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ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
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(const GLubyte *) indices);
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}
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}
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if (ctx->Const.CheckArrayBounds) {
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/* find max array index */
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GLuint max = 0;
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GLint i;
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if (type == GL_UNSIGNED_INT) {
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for (i = 0; i < count; i++)
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if (((GLuint *) indices)[i] > max)
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max = ((GLuint *) indices)[i];
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}
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else if (type == GL_UNSIGNED_SHORT) {
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for (i = 0; i < count; i++)
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if (((GLushort *) indices)[i] > max)
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max = ((GLushort *) indices)[i];
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}
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else {
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ASSERT(type == GL_UNSIGNED_BYTE);
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for (i = 0; i < count; i++)
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if (((GLubyte *) indices)[i] > max)
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max = ((GLubyte *) indices)[i];
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}
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if (max >= ctx->Array._MaxElement) {
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/* the max element is out of bounds of one or more enabled arrays */
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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GLboolean
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_mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
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GLuint start, GLuint end,
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GLsizei count, GLenum type,
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const GLvoid *indices)
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{
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ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
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if (count <= 0) {
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if (count < 0)
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_mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(count)" );
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return GL_FALSE;
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}
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if (mode > GL_POLYGON) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
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return GL_FALSE;
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}
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if (end < start) {
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_mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
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return GL_FALSE;
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}
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if (type != GL_UNSIGNED_INT &&
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type != GL_UNSIGNED_BYTE &&
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type != GL_UNSIGNED_SHORT) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
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return GL_FALSE;
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}
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if (ctx->NewState)
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_mesa_update_state(ctx);
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/* Always need vertex positions */
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if (!ctx->Array.Vertex.Enabled
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&& !(ctx->VertexProgram._Enabled && ctx->Array.VertexAttrib[0].Enabled))
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return GL_FALSE;
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if (ctx->Const.CheckArrayBounds) {
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/* Find max array index.
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* We don't trust the user's start and end values.
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*/
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GLuint max = 0;
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GLint i;
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if (type == GL_UNSIGNED_INT) {
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for (i = 0; i < count; i++)
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if (((GLuint *) indices)[i] > max)
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max = ((GLuint *) indices)[i];
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}
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else if (type == GL_UNSIGNED_SHORT) {
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for (i = 0; i < count; i++)
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if (((GLushort *) indices)[i] > max)
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max = ((GLushort *) indices)[i];
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}
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else {
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ASSERT(type == GL_UNSIGNED_BYTE);
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for (i = 0; i < count; i++)
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if (((GLubyte *) indices)[i] > max)
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max = ((GLubyte *) indices)[i];
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}
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if (max >= ctx->Array._MaxElement) {
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/* the max element is out of bounds of one or more enabled arrays */
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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/**
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* Called from the tnl module to error check the function parameters and
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* verify that we really can draw something.
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*/
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GLboolean
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_mesa_validate_DrawArrays(GLcontext *ctx,
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GLenum mode, GLint start, GLsizei count)
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{
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ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
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if (count < 0) {
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_mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
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return GL_FALSE;
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}
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if (mode > GL_POLYGON) {
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_mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
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return GL_FALSE;
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}
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if (ctx->NewState)
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_mesa_update_state(ctx);
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/* Always need vertex positions */
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if (!ctx->Array.Vertex.Enabled && !ctx->Array.VertexAttrib[0].Enabled)
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return GL_FALSE;
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if (ctx->Const.CheckArrayBounds) {
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if (start + count > (GLint) ctx->Array._MaxElement)
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return GL_FALSE;
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}
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return GL_TRUE;
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}
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