glsl: support compilation of geometry shaders

This commit adds all of the parsing and semantics for GLSL 150 style
geometry shaders.

v2 (Paul Berry <[email protected]>): Add a few missing calls to
get_pipeline_stage().  Fix some signed/unsigned comparison warnings.
Fix handling of NULL consumer in assign_varying_locations().

v3 (Bryan Cain <[email protected]>): fix indexing order of 2D
arrays.  Also, allow interpolation qualifiers in geometry shaders.

v4 (Paul Berry <[email protected]>): Eliminate
get_pipeline_stage()--it is no longer needed thanks to 030ca23 (mesa:
renumber shader indices according to their placement in pipeline).
Remove 2D stuff.  Move vertices_per_prim() to ir.h, so that it will be
accessible from outside the linker.  Remove
inject_num_vertices_visitor.  Rework for GLSL 1.50.

Reviewed-by: Ian Romanick <[email protected]>

v5 (Paul Berry <[email protected]>): Split out
do_set_program_inouts() argument refactoring to a separate patch.
Move geom_array_resizing_visitor to later in the series.

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index dad58deeb97..99dceacf85f 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1778,3 +1778,24 @@ ir_rvalue::as_rvalue_to_saturate()
 
    return NULL;
 }
+
+
+unsigned
+vertices_per_prim(GLenum prim)
+{
+   switch (prim) {
+   case GL_POINTS:
+      return 1;
+   case GL_LINES:
+      return 2;
+   case GL_TRIANGLES:
+      return 3;
+   case GL_LINES_ADJACENCY:
+      return 4;
+   case GL_TRIANGLES_ADJACENCY:
+      return 6;
+   default:
+      assert(!"Bad primitive");
+      return 3;
+   }
+}