mesa: add support for GL_INTEL_conservative_rasterization

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>

src/compiler/glsl/ast.h

@@ -610,6 +610,11 @@ struct ast_type_qualifier {
           * Flag set if GL_ARB_post_depth_coverage layout qualifier is used.
           */
          unsigned post_depth_coverage:1;
+         /**
+          * Flag set if GL_INTEL_conservartive_rasterization layout qualifier
+          * is used.
+          */
+         unsigned inner_coverage:1;
       }
       /** \brief Set of flags, accessed by name. */
       q;

src/compiler/glsl/ast_to_hir.cpp

@@ -3633,6 +3633,11 @@ apply_layout_qualifier_to_variable(const struct ast_type_qualifier *qual,
                        "valid in fragment shader input layout declaration.");
    }
 
+   if (qual->flags.q.inner_coverage) {
+      _mesa_glsl_error(loc, state, "inner_coverage layout qualifier only "
+                       "valid in fragment shader input layout declaration.");
+   }
+
    if (qual->flags.q.post_depth_coverage) {
       _mesa_glsl_error(loc, state, "post_depth_coverage layout qualifier only "
                        "valid in fragment shader input layout declaration.");

src/compiler/glsl/ast_type.cpp

@@ -579,6 +579,7 @@ ast_type_qualifier::validate_in_qualifier(YYLTYPE *loc,
       break;
    case MESA_SHADER_FRAGMENT:
       valid_in_mask.flags.q.early_fragment_tests = 1;
+      valid_in_mask.flags.q.inner_coverage = 1;
       valid_in_mask.flags.q.post_depth_coverage = 1;
       break;
    case MESA_SHADER_COMPUTE:
@@ -634,11 +635,23 @@ ast_type_qualifier::merge_into_in_qualifier(YYLTYPE *loc,
       state->in_qualifier->flags.q.early_fragment_tests = false;
    }
 
+   if (state->in_qualifier->flags.q.inner_coverage) {
+      state->fs_inner_coverage = true;
+      state->in_qualifier->flags.q.inner_coverage = false;
+   }
+
    if (state->in_qualifier->flags.q.post_depth_coverage) {
       state->fs_post_depth_coverage = true;
       state->in_qualifier->flags.q.post_depth_coverage = false;
    }
 
+   if (state->fs_inner_coverage && state->fs_post_depth_coverage) {
+      _mesa_glsl_error(loc, state,
+                       "inner_coverage & post_depth_coverage layout qualifiers "
+                       "are mutally exclusives");
+      r = false;
+   }
+
    /* We allow the creation of multiple cs_input_layout nodes. Coherence among
     * all existing nodes is checked later, when the AST node is transformed
     * into HIR.
@@ -707,7 +720,7 @@ ast_type_qualifier::validate_flags(YYLTYPE *loc,
                     "%s '%s':"
                     "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s"
                     "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s"
-                    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
+                    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
                     message, name,
                     bad.flags.q.invariant ? " invariant" : "",
                     bad.flags.q.precise ? " precise" : "",
@@ -768,6 +781,7 @@ ast_type_qualifier::validate_flags(YYLTYPE *loc,
                     bad.flags.q.vertices ? " vertices" : "",
                     bad.flags.q.subroutine ? " subroutine" : "",
                     bad.flags.q.subroutine_def ? " subroutine_def" : "",
+                    bad.flags.q.inner_coverage ? " inner_coverage" : "",
                     bad.flags.q.post_depth_coverage ? " post_depth_coverage" : "");
    return false;
 }

src/compiler/glsl/glsl_parser.yy

@@ -1372,9 +1372,10 @@ layout_qualifier_id:
                }
             }
          }
+      }
 
-         if (!$$.flags.i &&
-             match_layout_qualifier($1, "early_fragment_tests", state) == 0) {
+      if (!$$.flags.i) {
+         if (match_layout_qualifier($1, "early_fragment_tests", state) == 0) {
             /* From section 4.4.1.3 of the GLSL 4.50 specification
              * (Fragment Shader Inputs):
              *
@@ -1393,15 +1394,32 @@ layout_qualifier_id:
             $$.flags.q.early_fragment_tests = 1;
          }
 
-         if (!$$.flags.i &&
-             match_layout_qualifier($1, "post_depth_coverage", state) == 0) {
+         if (match_layout_qualifier($1, "inner_coverage", state) == 0) {
+            if (state->stage != MESA_SHADER_FRAGMENT) {
+               _mesa_glsl_error(& @1, state,
+                                "inner_coverage layout qualifier only "
+                                "valid in fragment shaders");
+            }
+
+	    if (state->INTEL_conservative_rasterization_enable) {
+	       $$.flags.q.inner_coverage = 1;
+	    } else {
+	       _mesa_glsl_error(& @1, state,
+                                "inner_coverage layout qualifier present, "
+                                "but the INTEL_conservative_rasterization extension "
+                                "is not enabled.");
+            }
+         }
+
+         if (match_layout_qualifier($1, "post_depth_coverage", state) == 0) {
             if (state->stage != MESA_SHADER_FRAGMENT) {
                _mesa_glsl_error(& @1, state,
                                 "post_depth_coverage layout qualifier only "
                                 "valid in fragment shaders");
             }
 
-            if (state->ARB_post_depth_coverage_enable) {
+            if (state->ARB_post_depth_coverage_enable ||
+		state->INTEL_conservative_rasterization_enable) {
                $$.flags.q.post_depth_coverage = 1;
             } else {
                _mesa_glsl_error(& @1, state,
@@ -1410,6 +1428,12 @@ layout_qualifier_id:
                                 "is not enabled.");
             }
          }
+
+         if ($$.flags.q.post_depth_coverage && $$.flags.q.inner_coverage) {
+            _mesa_glsl_error(& @1, state,
+                             "post_depth_coverage & inner_coverage layout qualifiers "
+                             "are mutually exclusive");
+         }
       }
 
       /* Layout qualifiers for tessellation evaluation shaders. */

src/compiler/glsl/glsl_parser_extras.cpp

@@ -293,6 +293,7 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->in_qualifier = new(this) ast_type_qualifier();
    this->out_qualifier = new(this) ast_type_qualifier();
    this->fs_early_fragment_tests = false;
+   this->fs_inner_coverage = false;
    this->fs_post_depth_coverage = false;
    this->fs_blend_support = 0;
    memset(this->atomic_counter_offsets, 0,
@@ -687,6 +688,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(EXT_texture_array),
    EXT_AEP(EXT_texture_buffer),
    EXT_AEP(EXT_texture_cube_map_array),
+   EXT(INTEL_conservative_rasterization),
    EXT(MESA_shader_integer_functions),
    EXT(NV_image_formats),
 };
@@ -1692,6 +1694,7 @@ set_shader_inout_layout(struct gl_shader *shader,
       assert(!state->fs_pixel_center_integer);
       assert(!state->fs_origin_upper_left);
       assert(!state->fs_early_fragment_tests);
+      assert(!state->fs_inner_coverage);
       assert(!state->fs_post_depth_coverage);
    }
 
@@ -1813,6 +1816,7 @@ set_shader_inout_layout(struct gl_shader *shader,
       shader->info.ARB_fragment_coord_conventions_enable =
          state->ARB_fragment_coord_conventions_enable;
       shader->info.EarlyFragmentTests = state->fs_early_fragment_tests;
+      shader->info.InnerCoverage = state->fs_inner_coverage;
       shader->info.PostDepthCoverage = state->fs_post_depth_coverage;
       shader->info.BlendSupport = state->fs_blend_support;
       break;

src/compiler/glsl/glsl_parser_extras.h

@@ -761,6 +761,8 @@ struct _mesa_glsl_parse_state {
    bool EXT_texture_buffer_warn;
    bool EXT_texture_cube_map_array_enable;
    bool EXT_texture_cube_map_array_warn;
+   bool INTEL_conservative_rasterization_enable;
+   bool INTEL_conservative_rasterization_warn;
    bool MESA_shader_framebuffer_fetch_enable;
    bool MESA_shader_framebuffer_fetch_warn;
    bool MESA_shader_framebuffer_fetch_non_coherent_enable;
@@ -788,6 +790,8 @@ struct _mesa_glsl_parse_state {
 
    bool fs_early_fragment_tests;
 
+   bool fs_inner_coverage;
+
    bool fs_post_depth_coverage;
 
    unsigned fs_blend_support;

src/compiler/glsl/linker.cpp

@@ -1889,7 +1889,8 @@ link_fs_inout_layout_qualifiers(struct gl_shader_program *prog,
 
       linked_shader->info.EarlyFragmentTests |=
          shader->info.EarlyFragmentTests;
-
+      linked_shader->info.InnerCoverage |=
+         shader->info.InnerCoverage;
       linked_shader->Program->info.fs.post_depth_coverage |=
          shader->info.PostDepthCoverage;
 

src/compiler/shader_info.h

@@ -116,6 +116,12 @@ typedef struct shader_info {
           * ARB_shader_image_load_store.
           */
          bool early_fragment_tests;
+
+         /**
+          * Defined by INTEL_conservative_rasterization.
+          */
+         bool inner_coverage;
+
          bool post_depth_coverage;
 
          /** gl_FragDepth layout for ARB_conservative_depth. */

src/mesa/main/api_validate.c

@@ -555,6 +555,48 @@ _mesa_valid_prim_mode(struct gl_context *ctx, GLenum mode, const char *name)
       }
    }
 
+   /* From GL_INTEL_conservative_rasterization spec:
+    *
+    * The conservative rasterization option applies only to polygons with
+    * PolygonMode state set to FILL. Draw requests for polygons with different
+    * PolygonMode setting or for other primitive types (points/lines) generate
+    * INVALID_OPERATION error.
+    */
+   if (ctx->IntelConservativeRasterization) {
+      GLboolean pass = GL_TRUE;
+
+      switch (mode) {
+      case GL_POINTS:
+      case GL_LINES:
+      case GL_LINE_LOOP:
+      case GL_LINE_STRIP:
+      case GL_LINES_ADJACENCY:
+      case GL_LINE_STRIP_ADJACENCY:
+         pass = GL_FALSE;
+         break;
+      case GL_TRIANGLES:
+      case GL_TRIANGLE_STRIP:
+      case GL_TRIANGLE_FAN:
+      case GL_QUADS:
+      case GL_QUAD_STRIP:
+      case GL_POLYGON:
+      case GL_TRIANGLES_ADJACENCY:
+      case GL_TRIANGLE_STRIP_ADJACENCY:
+         if (ctx->Polygon.FrontMode != GL_FILL ||
+             ctx->Polygon.BackMode != GL_FILL)
+            pass = GL_FALSE;
+         break;
+      default:
+         pass = GL_FALSE;
+      }
+      if (!pass) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "mode=%s invalid with GL_INTEL_conservative_rasterization",
+                     _mesa_lookup_prim_by_nr(mode));
+         return GL_FALSE;
+      }
+   }
+
    return GL_TRUE;
 }
 

src/mesa/main/enable.c

@@ -439,6 +439,14 @@ _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
          FLUSH_VERTICES(ctx, _NEW_COLOR);
          ctx->Color.IndexLogicOpEnabled = state;
          break;
+      case GL_CONSERVATIVE_RASTERIZATION_INTEL:
+         if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
+            goto invalid_enum_error;
+         if (ctx->IntelConservativeRasterization == state)
+            return;
+         FLUSH_VERTICES(ctx, _NEW_POLYGON);
+         ctx->IntelConservativeRasterization = state;
+         break;
       case GL_COLOR_LOGIC_OP:
          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
             goto invalid_enum_error;
@@ -1631,6 +1639,10 @@ _mesa_IsEnabled( GLenum cap )
          CHECK_EXTENSION(KHR_blend_equation_advanced_coherent);
          return ctx->Color.BlendCoherent;
 
+      case GL_CONSERVATIVE_RASTERIZATION_INTEL:
+         CHECK_EXTENSION(INTEL_conservative_rasterization);
+         return ctx->IntelConservativeRasterization;
+
       default:
          goto invalid_enum_error;
    }

src/mesa/main/extensions_table.h

@@ -290,6 +290,7 @@ EXT(IBM_texture_mirrored_repeat             , dummy_true
 
 EXT(INGR_blend_func_separate                , EXT_blend_func_separate                , GLL,  x ,  x ,  x , 1999)
 
+EXT(INTEL_conservative_rasterization        , INTEL_conservative_rasterization       ,  x ,  42,  x ,  32, 2013)
 EXT(INTEL_performance_query                 , INTEL_performance_query                , GLL, GLC,  x , ES2, 2013)
 
 EXT(KHR_blend_equation_advanced             , KHR_blend_equation_advanced            , GLL, GLC,  x , ES2, 2014)

src/mesa/main/mtypes.h

@@ -2175,6 +2175,7 @@ struct gl_shader_info
    bool uses_gl_fragcoord;
    bool redeclares_gl_fragcoord;
    bool PostDepthCoverage;
+   bool InnerCoverage;
    bool ARB_fragment_coord_conventions_enable;
 
    /**
@@ -3936,6 +3937,7 @@ struct gl_extensions
    GLboolean ATI_fragment_shader;
    GLboolean ATI_separate_stencil;
    GLboolean GREMEDY_string_marker;
+   GLboolean INTEL_conservative_rasterization;
    GLboolean INTEL_performance_query;
    GLboolean KHR_blend_equation_advanced;
    GLboolean KHR_blend_equation_advanced_coherent;
@@ -4619,6 +4621,7 @@ struct gl_context
    GLboolean TextureFormatSupported[MESA_FORMAT_COUNT];
 
    GLboolean RasterDiscard;  /**< GL_RASTERIZER_DISCARD */
+   GLboolean IntelConservativeRasterization; /**< GL_INTEL_CONSERVATIVE_RASTERIZATION */
 
    /**
     * \name Hooks for module contexts.  

src/mesa/main/shaderapi.c

@@ -2194,6 +2194,7 @@ _mesa_copy_linked_program_data(const struct gl_shader_program *src,
    case MESA_SHADER_FRAGMENT: {
       dst->info.fs.depth_layout = src->FragDepthLayout;
       dst->info.fs.early_fragment_tests = dst_sh->info.EarlyFragmentTests;
+      dst->info.fs.inner_coverage = dst_sh->info.InnerCoverage;
       dst->info.fs.post_depth_coverage = dst_sh->info.PostDepthCoverage;
       break;
    }