Mesa (master): r300/compiler: generalize depth texture mode to support arbitrary swizzles

[Marek Olšák]

Module: Mesa
Branch: master
Commit: eb9dc2595f33f43e99c70dd69588f5573459fbca
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=eb9dc2595f33f43e99c70dd69588f5573459fbca

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sat May  8 01:19:59 2010 +0200

r300/compiler: generalize depth texture mode to support arbitrary swizzles

---

 src/gallium/drivers/r300/r300_fs.c                 |    4 ++--
 src/mesa/drivers/dri/r300/compiler/radeon_code.h   |    2 +-
 .../drivers/dri/r300/compiler/radeon_program_tex.c |    6 +-----
 src/mesa/drivers/dri/r300/r300_fragprog_common.c   |   10 +++++-----
 4 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_fs.c b/src/gallium/drivers/r300/r300_fs.c
index 88303f0..5173e2c 100644
--- a/src/gallium/drivers/r300/r300_fs.c
+++ b/src/gallium/drivers/r300/r300_fs.c
@@ -147,8 +147,8 @@ static void get_external_state(
 
         if (s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
             /* XXX Gallium doesn't provide us with any information regarding
-             * this mode, so we are screwed. I'm setting 0 = LUMINANCE. */
-            state->unit[i].depth_texture_mode = 0;
+             * this mode, so we are screwed. Let's set INTENSITY for now. */
+            state->unit[i].depth_texture_swizzle = RC_SWIZZLE_XYZW;
 
             /* Fortunately, no need to translate this. */
             state->unit[i].texture_compare_func = s->state.compare_func;
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_code.h b/src/mesa/drivers/dri/r300/compiler/radeon_code.h
index 27274f0..17703a9 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_code.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_code.h
@@ -132,7 +132,7 @@ struct r300_fragment_program_external_state {
 		 *  2 - GL_ALPHA
 		 * depending on the depth texture mode.
 		 */
-		unsigned depth_texture_mode : 2;
+		unsigned depth_texture_swizzle:12;
 
 		/**
 		 * If the sampler is used as a shadow sampler,
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c b/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
index b4ba0b3..98e391a 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_tex.c
@@ -113,7 +113,6 @@ int radeonTransformTEX(
 			return 1;
 		} else {
 			rc_compare_func comparefunc = compiler->state.unit[inst->U.I.TexSrcUnit].texture_compare_func;
-			unsigned int depthmode = compiler->state.unit[inst->U.I.TexSrcUnit].depth_texture_mode;
 			struct rc_instruction * inst_rcp = rc_insert_new_instruction(c, inst);
 			struct rc_instruction * inst_mad = rc_insert_new_instruction(c, inst_rcp);
 			struct rc_instruction * inst_cmp = rc_insert_new_instruction(c, inst_mad);
@@ -141,10 +140,7 @@ int radeonTransformTEX(
 			inst_mad->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
 			inst_mad->U.I.SrcReg[2].File = RC_FILE_TEMPORARY;
 			inst_mad->U.I.SrcReg[2].Index = inst->U.I.DstReg.Index;
-			if (depthmode == 0) /* GL_LUMINANCE */
-				inst_mad->U.I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
-			else if (depthmode == 2) /* GL_ALPHA */
-				inst_mad->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_WWWW;
+			inst_mad->U.I.SrcReg[2].Swizzle = compiler->state.unit[inst->U.I.TexSrcUnit].depth_texture_swizzle;
 
 			/* Recall that SrcReg[0] is tex, SrcReg[2] is r and:
 			 *   r  < tex  <=>      -tex+r < 0
diff --git a/src/mesa/drivers/dri/r300/r300_fragprog_common.c b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
index 2b7c93a..6b1457c 100644
--- a/src/mesa/drivers/dri/r300/r300_fragprog_common.c
+++ b/src/mesa/drivers/dri/r300/r300_fragprog_common.c
@@ -46,13 +46,13 @@
 #include "radeon_mesa_to_rc.h"
 
 
-static GLuint build_dtm(GLuint depthmode)
+static GLuint build_dts(GLuint depthmode)
 {
 	switch(depthmode) {
 	default:
-	case GL_LUMINANCE: return 0;
-	case GL_INTENSITY: return 1;
-	case GL_ALPHA: return 2;
+	case GL_LUMINANCE: return RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
+	case GL_INTENSITY: return RC_SWIZZLE_XYZW;
+	case GL_ALPHA: return RC_SWIZZLE_WWWW;
 	}
 }
 
@@ -78,7 +78,7 @@ static void build_state(
 		if (fp->Base.ShadowSamplers & (1 << unit)) {
 			struct gl_texture_object* tex = r300->radeon.glCtx->Texture.Unit[unit]._Current;
 
-			state->unit[unit].depth_texture_mode = build_dtm(tex->DepthMode);
+			state->unit[unit].depth_texture_swizzle = build_dts(tex->DepthMode);
 			state->unit[unit].texture_compare_func = build_func(tex->CompareFunc);
 		}
 	}