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