mesa: Add support for ARB_draw_elements_base_vertex.

1 files changed, 41 insertions, 67 deletions

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 2df4f173893..4a1448deee6 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -29,7 +29,7 @@
 #include "imports.h"
 #include "mtypes.h"
 #include "state.h"
-
+#include "vbo/vbo.h"
 
 
 /**
@@ -52,51 +52,6 @@ index_bytes(GLenum type, GLsizei count)
 
 
 /**
- * Find the max index in the given element/index buffer
- */
-static GLuint
-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
@@ -124,6 +79,40 @@ check_valid_to_render(GLcontext *ctx, const char *function)
    return GL_TRUE;
 }
 
+static GLboolean
+check_index_bounds(GLcontext *ctx, GLsizei count, GLenum type,
+		   const GLvoid *indices, GLint basevertex)
+{
+   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 (min + basevertex < 0 ||
+       max + basevertex > 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 glDrawElements().  Includes parameter checking
@@ -133,7 +122,7 @@ check_valid_to_render(GLcontext *ctx, const char *function)
 GLboolean
 _mesa_validate_DrawElements(GLcontext *ctx,
 			    GLenum mode, GLsizei count, GLenum type,
-			    const GLvoid *indices)
+			    const GLvoid *indices, GLint basevertex)
 {
    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
 
@@ -177,17 +166,8 @@ _mesa_validate_DrawElements(GLcontext *ctx,
          return GL_FALSE;
    }
 
-   if (ctx->Const.CheckArrayBounds) {
-      /* find max array index */
-      GLuint max = 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;
-      }
-   }
+   if (!check_index_bounds(ctx, count, type, indices, basevertex))
+      return GL_FALSE;
 
    return GL_TRUE;
 }
@@ -202,7 +182,7 @@ GLboolean
 _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 				 GLuint start, GLuint end,
 				 GLsizei count, GLenum type,
-				 const GLvoid *indices)
+				 const GLvoid *indices, GLint basevertex)
 {
    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 
@@ -250,14 +230,8 @@ _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
          return GL_FALSE;
    }
 
-   if (ctx->Const.CheckArrayBounds) {
-      GLuint max = 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;
-      }
-   }
+   if (!check_index_bounds(ctx, count, type, indices, basevertex))
+      return GL_FALSE;
 
    return GL_TRUE;
 }