svn merge ^/branches/released . --username marha

1 files changed, 300 insertions, 0 deletions

diff --git a/mesalib/src/mesa/main/api_validate.c b/mesalib/src/mesa/main/api_validate.c
new file mode 100644
index 000000000..507e21fe8
--- /dev/null
+++ b/mesalib/src/mesa/main/api_validate.c
@@ -0,0 +1,300 @@
+/*
+ * 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 "glheader.h"
+#include "api_validate.h"
+#include "bufferobj.h"
+#include "context.h"
+#include "imports.h"
+#include "mtypes.h"
+#include "state.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(GLcontext *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.MapBuffer(ctx, GL_ELEMENT_ARRAY_BUFFER,
+                                  GL_READ_ONLY, 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, GL_ELEMENT_ARRAY_BUFFER_ARB, elementBuf);
+   }
+
+   return max;
+}
+
+
+/**
+ * Check if OK to draw arrays/elements.
+ */
+static GLboolean
+check_valid_to_render(GLcontext *ctx, const char *function)
+{
+   if (!_mesa_valid_to_render(ctx, function)) {
+      return GL_FALSE;
+   }
+
+#if FEATURE_es2_glsl
+   /* For ES2, we can draw if any vertex array is enabled (and we should
+    * always have a vertex program/shader).
+    */
+   if (ctx->Array.ArrayObj->_Enabled == 0x0 || !ctx->VertexProgram._Current)
+      return GL_FALSE;
+#else
+   /* For regular OpenGL, only draw if we have vertex positions (regardless
+    * of whether or not we have a vertex program/shader).
+    */
+   if (!ctx->Array.ArrayObj->Vertex.Enabled &&
+       !ctx->Array.ArrayObj->VertexAttrib[0].Enabled)
+      return GL_FALSE;
+#endif
+
+   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(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);
+
+   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 (ctx->Const.CheckArrayBounds) {
+      /* find max array index */
+      GLuint max = _mesa_max_buffer_index(ctx, count, type, indices,
+                                          ctx->Array.ElementArrayBufferObj);
+      if (max >= ctx->Array.ArrayObj->_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.ArrayObj->_MaxElement);
+         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(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);
+
+   if (!check_valid_to_render(ctx, "glDrawRangeElements"))
+      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, "glDrawRangeElements index out of buffer bounds");
+         return GL_FALSE;
+      }
+   }
+   else {
+      /* not using a VBO */
+      if (!indices)
+         return GL_FALSE;
+   }
+
+   if (ctx->Const.CheckArrayBounds) {
+      GLuint max = _mesa_max_buffer_index(ctx, count, type, indices,
+                                          ctx->Array.ElementArrayBufferObj);
+      if (max >= ctx->Array.ArrayObj->_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.
+ * \return GL_TRUE if OK to render, GL_FALSE if error found
+ */
+GLboolean
+_mesa_validate_DrawArrays(GLcontext *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 (mode > GL_POLYGON) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glDrawArrays(mode)" );
+      return GL_FALSE;
+   }
+
+   if (ctx->NewState)
+      _mesa_update_state(ctx);
+
+   if (!check_valid_to_render(ctx, "glDrawArrays"))
+      return GL_FALSE;
+
+   if (ctx->Const.CheckArrayBounds) {
+      if (start + count > (GLint) ctx->Array.ArrayObj->_MaxElement)
+         return GL_FALSE;
+   }
+
+   return GL_TRUE;
+}