[Mesa-stable] [PATCH] mesa/main: fix version/extension checks in _mesa_ClampColor

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

Add a proper check for feature support, and raise an invalid enum for
GL_CLAMP_VERTEX/FRAGMENT_COLOR unconditionally in core profiles, since
those enums were explicitly removed after the extension was promoted
to core functionality (not in the profile sense) with OpenGL 3.0.

This matches the behavior of the AMD closed source driver and fixes
GL45-CTS.gtf30.GL3Tests.half_float.half_float_textures.

Cc: "12.0 13.0" <mesa-stable at lists.freedesktop.org>
---
 src/mesa/main/blend.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 0322799..955fda1 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -854,40 +854,44 @@ _mesa_ColorMaski( GLuint buf, GLboolean red, GLboolean green,
    FLUSH_VERTICES(ctx, _NEW_COLOR);
    COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
 }
 
 
 void GLAPIENTRY
 _mesa_ClampColor(GLenum target, GLenum clamp)
 {
    GET_CURRENT_CONTEXT(ctx);
 
+   /* Check for both the extension and the GL version, since the Intel driver
+    * does not advertise the extension in core profiles.
+    */
+   if (ctx->Version <= 30 && !ctx->Extensions.ARB_color_buffer_float) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glClampColor()");
+      return;
+   }
+
    if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
       return;
    }
 
    switch (target) {
    case GL_CLAMP_VERTEX_COLOR_ARB:
-      if (ctx->API == API_OPENGL_CORE &&
-          !ctx->Extensions.ARB_color_buffer_float) {
+      if (ctx->API == API_OPENGL_CORE)
          goto invalid_enum;
-      }
       FLUSH_VERTICES(ctx, _NEW_LIGHT);
       ctx->Light.ClampVertexColor = clamp;
       _mesa_update_clamp_vertex_color(ctx, ctx->DrawBuffer);
       break;
    case GL_CLAMP_FRAGMENT_COLOR_ARB:
-      if (ctx->API == API_OPENGL_CORE &&
-          !ctx->Extensions.ARB_color_buffer_float) {
+      if (ctx->API == API_OPENGL_CORE)
          goto invalid_enum;
-      }
       FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
       ctx->Color.ClampFragmentColor = clamp;
       _mesa_update_clamp_fragment_color(ctx, ctx->DrawBuffer);
       break;
    case GL_CLAMP_READ_COLOR_ARB:
       ctx->Color.ClampReadColor = clamp;
       break;
    default:
       goto invalid_enum;
    }
-- 
2.7.4