mirror of
https://github.com/reactos/reactos.git
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253 lines
6.9 KiB
C
253 lines
6.9 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 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 <precomp.h>
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/**
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* \return number of bytes in array [count] of type.
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*/
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static GLsizei
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index_bytes(GLenum type, GLsizei count)
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{
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if (type == GL_UNSIGNED_INT) {
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return count * sizeof(GLuint);
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}
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else if (type == GL_UNSIGNED_BYTE) {
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return 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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return count * sizeof(GLushort);
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}
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}
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/**
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* Find the max index in the given element/index buffer
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*/
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GLuint
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_mesa_max_buffer_index(struct gl_context *ctx, GLuint count, GLenum type,
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const void *indices,
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struct gl_buffer_object *elementBuf)
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{
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const GLubyte *map = NULL;
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GLuint max = 0;
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GLuint i;
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if (_mesa_is_bufferobj(elementBuf)) {
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/* elements are in a user-defined buffer object. need to map it */
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map = ctx->Driver.MapBufferRange(ctx, 0, elementBuf->Size,
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GL_MAP_READ_BIT, elementBuf);
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/* Actual address is the sum of pointers */
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indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
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}
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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 (map) {
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ctx->Driver.UnmapBuffer(ctx, elementBuf);
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}
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return max;
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}
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/**
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* Check if OK to draw arrays/elements.
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*/
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static GLboolean
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check_valid_to_render(struct gl_context *ctx, const char *function)
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{
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if (!_mesa_valid_to_render(ctx, function)) {
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return GL_FALSE;
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}
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/* Draw if we have vertex positions (GL_VERTEX_ARRAY or generic
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* array [0]).
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*/
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return ctx->Array.VertexAttrib[VERT_ATTRIB_POS].Enabled;
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}
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/**
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* Do bounds checking on array element indexes. Check that the vertices
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* pointed to by the indices don't lie outside buffer object bounds.
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* \return GL_TRUE if OK, GL_FALSE if any indexed vertex goes is out of bounds
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*/
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static GLboolean
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check_index_bounds(struct gl_context *ctx, GLsizei count, GLenum type,
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const GLvoid *indices)
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{
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struct _mesa_prim prim;
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struct _mesa_index_buffer ib;
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GLuint min, max;
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/* Only the X Server needs to do this -- otherwise, accessing outside
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* array/BO bounds allows application termination.
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*/
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if (!ctx->Const.CheckArrayBounds)
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return GL_TRUE;
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memset(&prim, 0, sizeof(prim));
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prim.count = count;
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memset(&ib, 0, sizeof(ib));
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ib.type = type;
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ib.ptr = indices;
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ib.obj = ctx->Array.ElementArrayBufferObj;
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vbo_get_minmax_index(ctx, &prim, &ib, &min, &max);
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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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_mesa_warning(ctx, "glDrawElements() index=%u is out of bounds (max=%u)",
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max, 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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/**
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* Is 'mode' a valid value for glBegin(), glDrawArrays(), glDrawElements(),
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* etc? The set of legal values depends on whether geometry shaders/programs
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* are supported.
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*/
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GLboolean
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_mesa_valid_prim_mode(const struct gl_context *ctx, GLenum mode)
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{
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if (mode > GL_POLYGON) {
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return GL_FALSE;
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}
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else {
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return GL_TRUE;
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}
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}
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/**
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* Error checking for glDrawElements(). Includes parameter checking
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* and VBO bounds checking.
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* \return GL_TRUE if OK to render, GL_FALSE if error found
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*/
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GLboolean
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_mesa_validate_DrawElements(struct gl_context *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 (!_mesa_valid_prim_mode(ctx, mode)) {
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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 (!check_valid_to_render(ctx, "glDrawElements"))
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return GL_FALSE;
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/* Vertex buffer object tests */
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if (_mesa_is_bufferobj(ctx->Array.ElementArrayBufferObj)) {
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/* use indices in the buffer object */
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/* make sure count doesn't go outside buffer bounds */
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if (index_bytes(type, count) > 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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}
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else {
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/* not using a VBO */
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if (!indices)
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return GL_FALSE;
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}
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if (!check_index_bounds(ctx, count, type, indices))
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return GL_FALSE;
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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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* \return GL_TRUE if OK to render, GL_FALSE if error found
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*/
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GLboolean
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_mesa_validate_DrawArrays(struct gl_context *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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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 (!_mesa_valid_prim_mode(ctx, mode)) {
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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 (!check_valid_to_render(ctx, "glDrawArrays"))
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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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