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Diffstat (limited to 'src/mesa/main/api_validate.c')
-rw-r--r--src/mesa/main/api_validate.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
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+++ b/src/mesa/main/api_validate.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.1
+ *
+ * Copyright (C) 1999-2003 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 "glheader.h"
+#include "api_validate.h"
+#include "context.h"
+#include "imports.h"
+#include "mtypes.h"
+#include "state.h"
+
+
+GLboolean
+_mesa_validate_DrawElements(GLcontext *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 (mode > GL_POLYGON) {
+ _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 (ctx->NewState)
+ _mesa_update_state(ctx);
+
+ /* Always need vertex positions */
+ if (!ctx->Array.ArrayObj->Vertex.Enabled
+ && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
+ return GL_FALSE;
+
+ /* Vertex buffer object tests */
+ if (ctx->Array.ElementArrayBufferObj->Name) {
+ GLuint indexBytes;
+
+ /* use indices in the buffer object */
+ if (!ctx->Array.ElementArrayBufferObj->Data) {
+ _mesa_warning(ctx, "DrawElements with empty vertex elements buffer!");
+ return GL_FALSE;
+ }
+
+ /* make sure count doesn't go outside buffer bounds */
+ if (type == GL_UNSIGNED_INT) {
+ indexBytes = count * sizeof(GLuint);
+ }
+ else if (type == GL_UNSIGNED_BYTE) {
+ indexBytes = count * sizeof(GLubyte);
+ }
+ else {
+ ASSERT(type == GL_UNSIGNED_SHORT);
+ indexBytes = count * sizeof(GLushort);
+ }
+
+ if ((GLubyte *) indices + indexBytes >
+ ctx->Array.ElementArrayBufferObj->Data +
+ ctx->Array.ElementArrayBufferObj->Size) {
+ _mesa_warning(ctx, "glDrawElements index out of buffer bounds");
+ return GL_FALSE;
+ }
+
+ /* Actual address is the sum of pointers. Indices may be used below. */
+ if (ctx->Const.CheckArrayBounds) {
+ indices = (const GLvoid *)
+ ADD_POINTERS(ctx->Array.ElementArrayBufferObj->Data,
+ (const GLubyte *) indices);
+ }
+ }
+
+ if (ctx->Const.CheckArrayBounds) {
+ /* find max array index */
+ GLuint max = 0;
+ GLint i;
+ 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 (max >= ctx->Array._MaxElement) {
+ /* the max element is out of bounds of one or more enabled arrays */
+ return GL_FALSE;
+ }
+ }
+
+ return GL_TRUE;
+}
+
+
+GLboolean
+_mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
+ GLuint start, GLuint end,
+ 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, "glDrawRangeElements(count)" );
+ return GL_FALSE;
+ }
+
+ if (mode > GL_POLYGON) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(mode)" );
+ return GL_FALSE;
+ }
+
+ if (end < start) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glDrawRangeElements(end<start)");
+ return GL_FALSE;
+ }
+
+ if (type != GL_UNSIGNED_INT &&
+ type != GL_UNSIGNED_BYTE &&
+ type != GL_UNSIGNED_SHORT) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glDrawRangeElements(type)" );
+ return GL_FALSE;
+ }
+
+ if (ctx->NewState)
+ _mesa_update_state(ctx);
+
+ /* Always need vertex positions */
+ if (!ctx->Array.ArrayObj->Vertex.Enabled
+ && !(ctx->VertexProgram._Enabled && ctx->Array.ArrayObj->VertexAttrib[0].Enabled))
+ return GL_FALSE;
+
+ if (ctx->Const.CheckArrayBounds) {
+ /* Find max array index.
+ * We don't trust the user's start and end values.
+ */
+ GLuint max = 0;
+ GLint i;
+ 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 (max >= ctx->Array._MaxElement) {
+ /* the max element is out of bounds of one or more enabled arrays */
+ 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.
+ */
+GLboolean
+_mesa_validate_DrawArrays(GLcontext *ctx,
+ GLenum mode, GLint start, GLsizei count)
+{
+ ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+ if (count < 0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glDrawArrays(count)" );
+ return GL_FALSE;
+ }
+
+ if (mode > GL_POLYGON) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
+ return GL_FALSE;
+ }
+
+ if (ctx->NewState)
+ _mesa_update_state(ctx);
+
+ /* Always need vertex positions */
+ if (!ctx->Array.ArrayObj->Vertex.Enabled && !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
+ return GL_FALSE;
+
+ if (ctx->Const.CheckArrayBounds) {
+ if (start + count > (GLint) ctx->Array._MaxElement)
+ return GL_FALSE;
+ }
+
+ return GL_TRUE;
+}