gallium: rework handling of sprite_coord_enable state

Implement the pipe_rasterizer_state::sprite_coord_enable field
in the draw module (and softpipe) according to what's specified
in the documentation.

The draw module can now add any number of extra vertex attributes
to a post-transformed vertex and generate texcoords for those
attributes per sprite_coord_enable.  Auto-generated texcoords
for sprites only worked for one texcoord unit before.

The frag shader gl_PointCoord input is now implemented like any
other generic/texcoord attribute.

The draw module now needs to be informed about fragment shaders
since we need to look at the fragment shader's inputs to know
which ones need auto-generated texcoords.

Only softpipe has been updated so far.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/draw/draw_context.h b/src/gallium/auxiliary/draw/draw_context.h
index 4f0d30123a..1f27cbf488 100644
--- a/src/gallium/auxiliary/draw/draw_context.h
+++ b/src/gallium/auxiliary/draw/draw_context.h
@@ -46,6 +46,7 @@ struct draw_context;
 struct draw_stage;
 struct draw_vertex_shader;
 struct draw_geometry_shader;
+struct draw_fragment_shader;
 struct tgsi_sampler;
 
 #define DRAW_MAX_TEXTURE_LEVELS 13  /* 4K x 4K for now */
@@ -138,6 +139,17 @@ void draw_delete_vertex_shader(struct draw_context *draw,
 
 
 /*
+ * Fragment shader functions
+ */
+struct draw_fragment_shader *
+draw_create_fragment_shader(struct draw_context *draw,
+                            const struct pipe_shader_state *shader);
+void draw_bind_fragment_shader(struct draw_context *draw,
+                               struct draw_fragment_shader *dvs);
+void draw_delete_fragment_shader(struct draw_context *draw,
+                                 struct draw_fragment_shader *dvs);
+
+/*
  * Geometry shader functions
  */
 struct draw_geometry_shader *