Mesa (master): nvfx: Add support for two sided color

[Luca Barbieri]

Module: Mesa
Branch: master
Commit: 7fc7b759950e8c7482a3dbbf25d6604960c25092
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7fc7b759950e8c7482a3dbbf25d6604960c25092

Author: Luca Barbieri <luca at luca-barbieri.com>
Date:   Mon Jan 11 01:09:44 2010 +0100

nvfx: Add support for two sided color

This patch adds support for two-sided vertex color to nv30/nv40.

When set, the COLOR0/1 fs inputs on back faces will be wired to vs outputs BCOLOR0/1.
This makes OpenGL two sided lighting work, which can be tested with progs/demos/projtex.

---

 src/gallium/drivers/nvfx/nvfx_context.h |    2 +-
 src/gallium/drivers/nvfx/nvfx_state.c   |    4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/nvfx/nvfx_context.h b/src/gallium/drivers/nvfx/nvfx_context.h
index fea05ac..e2c6d09 100644
--- a/src/gallium/drivers/nvfx/nvfx_context.h
+++ b/src/gallium/drivers/nvfx/nvfx_context.h
@@ -46,7 +46,7 @@
 struct nvfx_rasterizer_state {
 	struct pipe_rasterizer_state pipe;
 	unsigned sb_len;
-	uint32_t sb[30];
+	uint32_t sb[32];
 };
 
 struct nvfx_zsa_state {
diff --git a/src/gallium/drivers/nvfx/nvfx_state.c b/src/gallium/drivers/nvfx/nvfx_state.c
index 0f03c2e..315de49 100644
--- a/src/gallium/drivers/nvfx/nvfx_state.c
+++ b/src/gallium/drivers/nvfx/nvfx_state.c
@@ -193,7 +193,6 @@ nvfx_rasterizer_state_create(struct pipe_context *pipe,
 	struct nouveau_statebuf_builder sb = sb_init(rsso->sb);
 
 	/*XXX: ignored:
-	 * 	light_twoside
 	 * 	point_smooth -nohw
 	 * 	multisample
 	 */
@@ -202,6 +201,9 @@ nvfx_rasterizer_state_create(struct pipe_context *pipe,
 	sb_data(sb, cso->flatshade ? NV34TCL_SHADE_MODEL_FLAT :
 				       NV34TCL_SHADE_MODEL_SMOOTH);
 
+	sb_method(sb, NV34TCL_VERTEX_TWO_SIDE_ENABLE, 1);
+	sb_data(sb, cso->light_twoside);
+
 	sb_method(sb, NV34TCL_LINE_WIDTH, 2);
 	sb_data(sb, (unsigned char)(cso->line_width * 8.0) & 0xff);
 	sb_data(sb, cso->line_smooth ? 1 : 0);