[Mesa-dev] [PATCH 29/34] glsl: Export the compiler's GS layout qualifiers to the gl_shader.

[Paul Berry]

From: Eric Anholt <eric at anholt.net>

Next step is to validate them at link time.

v2 (Paul Berry <stereotype441 at gmail.com>): Don't attempt to export the
layout qualifiers in the event of a compile error, since some of them
are set up by ast_to_hir(), and ast_to_hir() isn't guaranteed to have
run in the event of a compile error.
---
 src/glsl/glsl_parser_extras.cpp | 31 +++++++++++++++++++++++++++++++
 src/mesa/main/mtypes.h          | 18 ++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 6b8fb45..2311447 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -1446,6 +1446,34 @@ ast_struct_specifier::ast_struct_specifier(const char *identifier,
    is_declaration = true;
 }
 
+static void
+set_shader_inout_layout(struct gl_shader *shader,
+		     struct _mesa_glsl_parse_state *state)
+{
+   if (shader->Type != GL_GEOMETRY_SHADER) {
+      /* Should have been prevented by the parser. */
+      assert(!state->gs_input_prim_type_specified);
+      assert(!state->out_qualifier->flags.i);
+      return;
+   }
+
+   shader->Geom.VerticesOut = 0;
+   if (state->out_qualifier->flags.q.max_vertices)
+      shader->Geom.VerticesOut = state->out_qualifier->max_vertices;
+
+   if (state->gs_input_prim_type_specified) {
+      shader->Geom.InputType = state->gs_input_prim_type;
+   } else {
+      shader->Geom.InputType = ~0;
+   }
+
+   if (state->out_qualifier->flags.q.prim_type) {
+      shader->Geom.OutputType = state->out_qualifier->prim_type;
+   } else {
+      shader->Geom.OutputType = ~0;
+   }
+}
+
 extern "C" {
 
 void
@@ -1521,6 +1549,9 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
    shader->UniformBlocks = state->uniform_blocks;
    ralloc_steal(shader, shader->UniformBlocks);
 
+   if (!state->error)
+      set_shader_inout_layout(shader, state);
+
    /* Retain any live IR, but trash the rest. */
    reparent_ir(shader->ir, shader->ir);
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 33075bd..bc90d09 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2170,6 +2170,24 @@ struct gl_shader
    /** Shaders containing built-in functions that are used for linking. */
    struct gl_shader *builtins_to_link[16];
    unsigned num_builtins_to_link;
+
+   /**
+    * Geometry shader state from GLSL 1.50 layout qualifiers.
+    */
+   struct {
+      GLint VerticesOut;
+      /**
+       * GL_POINTS, GL_LINES, GL_LINES_ADJACENCY_ARB, GL_TRIANGLES, or
+       * GL_TRIANGLES_ADJACENCY_ARB, or ~0 if it's not set in this shader
+       * (since GL_POINTS is 0).
+       */
+      GLenum InputType;
+       /**
+        * GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP, or ~0 if it's not set
+        * in this shader (since GL_POINTS is 0).
+        */
+      GLenum OutputType;
+   } Geom;
 };
 
 
-- 
1.8.3.4