[Mesa-dev] [PATCH 05/13] nouveau: Enable EXT_texture_env_dot3 on NV10 and NV20

[Ian Romanick]

From: Ian Romanick <ian.d.romanick at intel.com>

GL_DOT3_RGB_EXT and GL_DOT3_RGBA_EXT. are nearly identical to
GL_DOT3_RGB and GL_DOT3_RGBA.  The only difference is the _EXT
versions do not apply the post-scale.  Just smash logscale to 0 so
that RC_OUT_SCALE_1 is always used.

NOTE: I have not actually tested this.

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
---
 src/mesa/drivers/dri/nouveau/nv10_context.c    |  1 +
 src/mesa/drivers/dri/nouveau/nv10_state_frag.c | 16 +++++++++++++++-
 src/mesa/drivers/dri/nouveau/nv20_context.c    |  1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/nouveau/nv10_context.c b/src/mesa/drivers/dri/nouveau/nv10_context.c
index 00a9358..7a86ba2 100644
--- a/src/mesa/drivers/dri/nouveau/nv10_context.c
+++ b/src/mesa/drivers/dri/nouveau/nv10_context.c
@@ -448,6 +448,7 @@ nv10_context_create(struct nouveau_screen *screen, gl_api api,
 	ctx->Extensions.ARB_texture_env_crossbar = true;
 	ctx->Extensions.ARB_texture_env_combine = true;
 	ctx->Extensions.ARB_texture_env_dot3 = true;
+	ctx->Extensions.EXT_texture_env_dot3 = true;
 	ctx->Extensions.NV_fog_distance = true;
 	ctx->Extensions.NV_texture_rectangle = true;
 	if (ctx->Mesa_DXTn) {
diff --git a/src/mesa/drivers/dri/nouveau/nv10_state_frag.c b/src/mesa/drivers/dri/nouveau/nv10_state_frag.c
index e78eac3..c6e4bb0 100644
--- a/src/mesa/drivers/dri/nouveau/nv10_state_frag.c
+++ b/src/mesa/drivers/dri/nouveau/nv10_state_frag.c
@@ -276,6 +276,20 @@ setup_combiner(struct combiner_state *rc)
 		rc->out = RC_OUT_DOT_AB;
 		break;
 
+	case GL_DOT3_RGB_EXT:
+	case GL_DOT3_RGBA_EXT:
+		INPUT_ARG(rc, A, 0, NORMALIZE);
+		INPUT_ARG(rc, B, 1, NORMALIZE);
+
+		rc->out = RC_OUT_DOT_AB;
+
+		/* The EXT version of the DOT3 extension does not support the
+		 * scale factor, but the ARB version (and the version in
+		 * OpenGL 1.3) does.
+		 */
+		rc->logscale = 0;
+		break;
+
 	default:
 		assert(0);
 	}
@@ -305,7 +319,7 @@ nv10_get_general_combiner(struct gl_context *ctx, int i,
 	if (ctx->Texture.Unit[i]._Current) {
 		INIT_COMBINER(RGB, ctx, &rc_c, i);
 
-		if (rc_c.mode == GL_DOT3_RGBA)
+		if (rc_c.mode == GL_DOT3_RGBA || rc_c.mode == GL_DOT3_RGBA_EXT)
 			rc_a = rc_c;
 		else
 			INIT_COMBINER(A, ctx, &rc_a, i);
diff --git a/src/mesa/drivers/dri/nouveau/nv20_context.c b/src/mesa/drivers/dri/nouveau/nv20_context.c
index 14329a2..ec638c0 100644
--- a/src/mesa/drivers/dri/nouveau/nv20_context.c
+++ b/src/mesa/drivers/dri/nouveau/nv20_context.c
@@ -459,6 +459,7 @@ nv20_context_create(struct nouveau_screen *screen, gl_api api,
 	ctx->Extensions.ARB_texture_env_crossbar = true;
 	ctx->Extensions.ARB_texture_env_combine = true;
 	ctx->Extensions.ARB_texture_env_dot3 = true;
+	ctx->Extensions.EXT_texture_env_dot3 = true;
 	ctx->Extensions.NV_fog_distance = true;
 	ctx->Extensions.NV_texture_rectangle = true;
 	if (ctx->Mesa_DXTn) {
-- 
2.5.5