mesa: Implement ARB_shader_viewport_layer_array for i965

This extension is a combination of AMD_vertex_shader_viewport_index and
AMD_vertex_shader_layer, making it rather trivial to implement.

For gallium I *think* this needs a new cap because of the addition of
support in tessellation evaluation shaders, and since I don't have any
hardware to test it on, I've left that for someone else to wire up.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

3 files changed, 15 insertions, 2 deletions

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index f47daab..b66ad00 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -1000,11 +1000,13 @@ builtin_variable_generator::generate_vs_special_vars()
       add_system_value(SYSTEM_VALUE_BASE_INSTANCE, int_t, "gl_BaseInstanceARB");
       add_system_value(SYSTEM_VALUE_DRAW_ID, int_t, "gl_DrawIDARB");
    }
-   if (state->AMD_vertex_shader_layer_enable) {
+   if (state->AMD_vertex_shader_layer_enable ||
+       state->ARB_shader_viewport_layer_array_enable) {
       var = add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
       var->data.interpolation = INTERP_MODE_FLAT;
    }
-   if (state->AMD_vertex_shader_viewport_index_enable) {
+   if (state->AMD_vertex_shader_viewport_index_enable ||
+       state->ARB_shader_viewport_layer_array_enable) {
       var = add_output(VARYING_SLOT_VIEWPORT, int_t, "gl_ViewportIndex");
       var->data.interpolation = INTERP_MODE_FLAT;
    }
@@ -1066,6 +1068,8 @@ builtin_variable_generator::generate_tcs_special_vars()
 void
 builtin_variable_generator::generate_tes_special_vars()
 {
+   ir_variable *var;
+
    add_system_value(SYSTEM_VALUE_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
    add_system_value(SYSTEM_VALUE_VERTICES_IN, int_t, "gl_PatchVerticesIn");
    add_system_value(SYSTEM_VALUE_TESS_COORD, vec3_t, "gl_TessCoord");
@@ -1073,6 +1077,12 @@ builtin_variable_generator::generate_tes_special_vars()
                     "gl_TessLevelOuter");
    add_system_value(SYSTEM_VALUE_TESS_LEVEL_INNER, array(float_t, 2),
                     "gl_TessLevelInner");
+   if (state->ARB_shader_viewport_layer_array_enable) {
+      var = add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
+      var->data.interpolation = INTERP_MODE_FLAT;
+      var = add_output(VARYING_SLOT_VIEWPORT, int_t, "gl_ViewportIndex");
+      var->data.interpolation = INTERP_MODE_FLAT;
+   }
 }
 
 
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 0e9bfa7..84d923f 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -618,6 +618,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    EXT(ARB_shader_subroutine),
    EXT(ARB_shader_texture_image_samples),
    EXT(ARB_shader_texture_lod),
+   EXT(ARB_shader_viewport_layer_array),
    EXT(ARB_shading_language_420pack),
    EXT(ARB_shading_language_packing),
    EXT(ARB_tessellation_shader),
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 027b97e..e19f6ad 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -632,6 +632,8 @@ struct _mesa_glsl_parse_state {
    bool ARB_shader_texture_image_samples_warn;
    bool ARB_shader_texture_lod_enable;
    bool ARB_shader_texture_lod_warn;
+   bool ARB_shader_viewport_layer_array_enable;
+   bool ARB_shader_viewport_layer_array_warn;
    bool ARB_shading_language_420pack_enable;
    bool ARB_shading_language_420pack_warn;
    bool ARB_shading_language_packing_enable;