mesa: allow drivers not to expose ARB_color_buffer_float in GL core profile

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/drivers/common/meta.c

@@ -757,7 +757,8 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
        * it's for the pixel path (ClampFragmentColor is GL_TRUE),
        * regardless of the internal implementation of the metaops.
        */
-      if (ctx->Color.ClampFragmentColor != GL_TRUE)
+      if (ctx->Color.ClampFragmentColor != GL_TRUE &&
+          ctx->Extensions.ARB_color_buffer_float)
 	 _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
    }
 
@@ -767,7 +768,8 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
       /* Generally in here we never want vertex color clamping --
        * result clamping is only dependent on fragment clamping.
        */
-      _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR, GL_FALSE);
+      if (ctx->Extensions.ARB_color_buffer_float)
+         _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR, GL_FALSE);
    }
 
    if (state & MESA_META_CONDITIONAL_RENDER) {
@@ -1091,11 +1093,13 @@ _mesa_meta_end(struct gl_context *ctx)
       _mesa_DepthRange(save->DepthNear, save->DepthFar);
    }
 
-   if (state & MESA_META_CLAMP_FRAGMENT_COLOR) {
+   if (state & MESA_META_CLAMP_FRAGMENT_COLOR &&
+       ctx->Extensions.ARB_color_buffer_float) {
       _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, save->ClampFragmentColor);
    }
 
-   if (state & MESA_META_CLAMP_VERTEX_COLOR) {
+   if (state & MESA_META_CLAMP_VERTEX_COLOR &&
+       ctx->Extensions.ARB_color_buffer_float) {
       _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR, save->ClampVertexColor);
    }
 
@@ -2044,7 +2048,8 @@ _mesa_meta_Clear(struct gl_context *ctx, GLbitfield buffers)
       /* leave colormask, glDrawBuffer state as-is */
 
       /* Clears never have the color clamped. */
-      _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
+      if (ctx->Extensions.ARB_color_buffer_float)
+         _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
    }
    else {
       ASSERT(metaSave & MESA_META_COLOR_MASK);
@@ -2295,7 +2300,8 @@ _mesa_meta_glsl_Clear(struct gl_context *ctx, GLbitfield buffers)
       /* leave colormask, glDrawBuffer state as-is */
 
       /* Clears never have the color clamped. */
-      _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
+      if (ctx->Extensions.ARB_color_buffer_float)
+         _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE);
    }
    else {
       ASSERT(metaSave & MESA_META_COLOR_MASK);

src/mesa/main/attrib.c

@@ -986,7 +986,9 @@ _mesa_PopAttrib(void)
                _mesa_set_enable(ctx, GL_INDEX_LOGIC_OP,
                                 color->IndexLogicOpEnabled);
                _mesa_set_enable(ctx, GL_DITHER, color->DitherFlag);
-               _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB, color->ClampFragmentColor);
+               if (ctx->Extensions.ARB_color_buffer_float)
+                  _mesa_ClampColor(GL_CLAMP_FRAGMENT_COLOR_ARB,
+                                   color->ClampFragmentColor);
                _mesa_ClampColor(GL_CLAMP_READ_COLOR_ARB, color->ClampReadColor);
 
                /* GL_ARB_framebuffer_sRGB / GL_EXT_framebuffer_sRGB */
@@ -1114,7 +1116,10 @@ _mesa_PopAttrib(void)
                /* materials */
                memcpy(&ctx->Light.Material, &light->Material,
                       sizeof(struct gl_material));
-               _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR_ARB, light->ClampVertexColor);
+               if (ctx->Extensions.ARB_color_buffer_float) {
+                  _mesa_ClampColor(GL_CLAMP_VERTEX_COLOR_ARB,
+                                   light->ClampVertexColor);
+               }
             }
             break;
          case GL_LINE_BIT:

src/mesa/main/blend.c

@@ -765,11 +765,19 @@ _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) {
+         goto invalid_enum;
+      }
       FLUSH_VERTICES(ctx, _NEW_LIGHT);
       ctx->Light.ClampVertexColor = clamp;
       _mesa_update_clamp_vertex_color(ctx);
       break;
    case GL_CLAMP_FRAGMENT_COLOR_ARB:
+      if (ctx->API == API_OPENGL_CORE &&
+          !ctx->Extensions.ARB_color_buffer_float) {
+         goto invalid_enum;
+      }
       FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
       ctx->Color.ClampFragmentColor = clamp;
       _mesa_update_clamp_fragment_color(ctx);
@@ -779,9 +787,13 @@ _mesa_ClampColor(GLenum target, GLenum clamp)
       ctx->Color.ClampReadColor = clamp;
       break;
    default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
-      return;
+      goto invalid_enum;
    }
+   return;
+
+invalid_enum:
+   _mesa_error(ctx, GL_INVALID_ENUM, "glClampColor(%s)",
+               _mesa_lookup_enum_by_nr(target));
 }
 
 static GLboolean
@@ -892,7 +904,8 @@ void _mesa_init_color( struct gl_context * ctx )
       ctx->Color.DrawBuffer[0] = GL_FRONT;
    }
 
-   ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
+   ctx->Color.ClampFragmentColor = ctx->API == API_OPENGL_COMPAT ?
+                                   GL_FIXED_ONLY_ARB : GL_FALSE;
    ctx->Color._ClampFragmentColor = GL_FALSE;
    ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
 

src/mesa/main/get.c

@@ -358,6 +358,13 @@ EXTRA_EXT(ARB_texture_cube_map_array);
 EXTRA_EXT(ARB_texture_buffer_range);
 EXTRA_EXT(ARB_texture_multisample);
 
+static const int
+extra_ARB_color_buffer_float_or_glcore[] = {
+   EXT(ARB_color_buffer_float),
+   EXTRA_API_GL_CORE,
+   EXTRA_END
+};
+
 static const int
 extra_NV_primitive_restart[] = {
    EXT(NV_primitive_restart),
@@ -869,7 +876,7 @@ find_custom_value(struct gl_context *ctx, const struct value_desc *d, union valu
  * \param func name of calling glGet*v() function for error reporting
  * \param d the struct value_desc that has the extra constraints
  *
- * \return GL_FALSE if one of the constraints was not satisfied,
+ * \return GL_FALSE if all of the constraints were not satisfied,
  *     otherwise GL_TRUE.
  */
 static GLboolean

src/mesa/main/get_hash_params.py

@@ -96,7 +96,7 @@ descriptor=[
 # GL_ARB_color_buffer_float
   [ "CLAMP_VERTEX_COLOR", "CONTEXT_ENUM(Light.ClampVertexColor), extra_ARB_color_buffer_float" ],
   [ "CLAMP_FRAGMENT_COLOR", "CONTEXT_ENUM(Color.ClampFragmentColor), extra_ARB_color_buffer_float" ],
-  [ "CLAMP_READ_COLOR", "CONTEXT_ENUM(Color.ClampReadColor), extra_ARB_color_buffer_float" ],
+  [ "CLAMP_READ_COLOR", "CONTEXT_ENUM(Color.ClampReadColor), extra_ARB_color_buffer_float_or_glcore" ],
 
 # GL_ARB_copy_buffer
   [ "COPY_READ_BUFFER", "LOC_CUSTOM, TYPE_INT, 0, NO_EXTRA" ],

src/mesa/main/light.c

@@ -1202,7 +1202,8 @@ _mesa_init_lighting( struct gl_context *ctx )
                                                NULL );
 
    ctx->Light.ColorMaterialEnabled = GL_FALSE;
-   ctx->Light.ClampVertexColor = GL_TRUE;
+   ctx->Light.ClampVertexColor = ctx->API == API_OPENGL_COMPAT;
+   ctx->Light._ClampVertexColor = ctx->API == API_OPENGL_COMPAT;
 
    /* Miscellaneous */
    ctx->Light._NeedEyeCoords = GL_FALSE;

src/mesa/main/version.c

@@ -233,7 +233,8 @@ compute_version(struct gl_context *ctx)
    const GLboolean ver_3_0 = (ver_2_1 &&
                               ctx->Const.GLSLVersion >= 130 &&
                               ctx->Const.MaxSamples >= 4 &&
-                              ctx->Extensions.ARB_color_buffer_float &&
+                              (ctx->API == API_OPENGL_CORE ||
+                               ctx->Extensions.ARB_color_buffer_float) &&
                               ctx->Extensions.ARB_depth_buffer_float &&
                               ctx->Extensions.ARB_half_float_pixel &&
                               ctx->Extensions.ARB_half_float_vertex &&