mesa/main: fix version/extension checks in _mesa_ClampColor

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" <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>

1 files changed, 10 insertions, 6 deletions

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 0322799af54..955fda1158c 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -861,6 +861,14 @@ _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;
@@ -868,19 +876,15 @@ _mesa_ClampColor(GLenum target, GLenum clamp)
 
    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);