From cf3193ad1cd75b847c5d626def701a4bb012d080 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Sun, 4 Apr 2010 18:18:28 -0600
Subject: [PATCH] mesa: new validation functions for GL_ARB_draw_instanced

---
 src/mesa/main/api_validate.c | 107 ++++++++++++++++++++++++++++++++++-
 src/mesa/main/api_validate.h |  10 ++++
 2 files changed, 116 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index 4fb7b5ad61f..f6da86d2961 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -175,7 +175,7 @@ _mesa_validate_DrawElements(GLcontext *ctx,
 			    GLenum mode, GLsizei count, GLenum type,
 			    const GLvoid *indices, GLint basevertex)
 {
-   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx,  GL_FALSE);
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 
    if (count <= 0) {
       if (count < 0)
@@ -314,3 +314,108 @@ _mesa_validate_DrawArrays(GLcontext *ctx,
 
    return GL_TRUE;
 }
+
+
+GLboolean
+_mesa_validate_DrawArraysInstanced(GLcontext *ctx, GLenum mode, GLint first,
+                                   GLsizei count, GLsizei primcount)
+{
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+   if (count <= 0) {
+      if (count < 0)
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glDrawArraysInstanced(count=%d)", count);
+      return GL_FALSE;
+   }
+
+   if (mode > GL_POLYGON) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glDrawArraysInstanced(mode=0x%x)", mode);
+      return GL_FALSE;
+   }
+
+   if (primcount <= 0) {
+      if (primcount < 0)
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glDrawArraysInstanced(primcount=%d)", primcount);
+      return GL_FALSE;
+   }
+
+   if (!check_valid_to_render(ctx, "glDrawArraysInstanced(invalid to render)"))
+      return GL_FALSE;
+
+   if (ctx->CompileFlag) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glDrawArraysInstanced(display list");
+      return GL_FALSE;
+   }
+
+   if (ctx->Const.CheckArrayBounds) {
+      if (first + count > (GLint) ctx->Array.ArrayObj->_MaxElement)
+         return GL_FALSE;
+   }
+
+   return GL_TRUE;
+}
+
+
+GLboolean
+_mesa_validate_DrawElementsInstanced(GLcontext *ctx,
+                                     GLenum mode, GLsizei count, GLenum type,
+                                     const GLvoid *indices, GLsizei primcount)
+{
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+   if (count <= 0) {
+      if (count < 0)
+	 _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glDrawElementsInstanced(count=%d)", count);
+      return GL_FALSE;
+   }
+
+   if (mode > GL_POLYGON) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glDrawElementsInstanced(mode = 0x%x)", mode);
+      return GL_FALSE;
+   }
+
+   if (type != GL_UNSIGNED_INT &&
+       type != GL_UNSIGNED_BYTE &&
+       type != GL_UNSIGNED_SHORT) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glDrawElementsInstanced(type=0x%x)", type);
+      return GL_FALSE;
+   }
+
+   if (primcount <= 0) {
+      if (primcount < 0)
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glDrawElementsInstanced(primcount=%d)", primcount);
+      return GL_FALSE;
+   }
+
+   if (!check_valid_to_render(ctx, "glDrawElementsInstanced"))
+      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,
+                       "glDrawElementsInstanced 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, 0))
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
diff --git a/src/mesa/main/api_validate.h b/src/mesa/main/api_validate.h
index 6064d15fe6c..cd27d58aa7d 100644
--- a/src/mesa/main/api_validate.h
+++ b/src/mesa/main/api_validate.h
@@ -52,4 +52,14 @@ _mesa_validate_DrawRangeElements(GLcontext *ctx, GLenum mode,
 				 const GLvoid *indices, GLint basevertex);
 
 
+extern GLboolean
+_mesa_validate_DrawArraysInstanced(GLcontext *ctx, GLenum mode, GLint first,
+                                   GLsizei count, GLsizei primcount);
+
+extern GLboolean
+_mesa_validate_DrawElementsInstanced(GLcontext *ctx,
+                                     GLenum mode, GLsizei count, GLenum type,
+                                     const GLvoid *indices, GLsizei primcount);
+
+
 #endif
-- 
2.30.2