Stefan Dösinger : wined3d: A small atifs bump map improvement.
Alexandre Julliard
julliard at winehq.org
Wed Jun 10 10:16:58 CDT 2009
Module: wine
Branch: master
Commit: 8e259d9fcdaaa75a9086d0d2e58d71375c61b38c
URL: http://source.winehq.org/git/wine.git/?a=commit;h=8e259d9fcdaaa75a9086d0d2e58d71375c61b38c
Author: Stefan Dösinger <stefan at codeweavers.com>
Date: Fri May 29 23:01:07 2009 +0200
wined3d: A small atifs bump map improvement.
Thanks to Roland Scheidegger from Tungsten Graphics for the suggestion to
replace the 2 movs + dp2add with two MADs, where one can conveniently be
coissued with the other dp2add.
---
dlls/wined3d/ati_fragment_shader.c | 35 +++++++++++++++--------------------
1 files changed, 15 insertions(+), 20 deletions(-)
diff --git a/dlls/wined3d/ati_fragment_shader.c b/dlls/wined3d/ati_fragment_shader.c
index 1baf9ba..1f6f203 100644
--- a/dlls/wined3d/ati_fragment_shader.c
+++ b/dlls/wined3d/ati_fragment_shader.c
@@ -423,13 +423,6 @@ static GLuint gen_ati_shader(const struct texture_stage_op op[MAX_TEXTURES], con
GL_EXTCALL(glPassTexCoordATI(GL_REG_0_ATI + stage + 1,
GL_TEXTURE0_ARB + stage + 1,
swizzle));
-
- /* We need GL_REG_5_ATI as a temporary register to swizzle the bump matrix. So we run into
- * issues if we're bump mapping on stage 4 or 5
- */
- if(stage >= 4) {
- FIXME("Bump mapping in stage %d\n", stage);
- }
}
/* Pass 2: Generate perturbation calculations */
@@ -460,22 +453,24 @@ static GLuint gen_ati_shader(const struct texture_stage_op op[MAX_TEXTURES], con
ATI_FFP_CONST_BUMPMAT(stage), GL_NONE, GL_2X_BIT_ATI | GL_BIAS_BIT_ATI,
GL_REG_0_ATI + stage + 1, GL_RED, GL_NONE);
- /* FIXME: How can I make GL_DOT2_ADD_ATI read the factors from blue and alpha? It defaults to red and green,
- * and it is fairly easy to make it read GL_BLUE or BL_ALPHA, but I can't get an R * B + G * A. So we're wasting
- * one register and two instructions in this pass for a simple swizzling operation.
- * For starters it might be good enough to merge the two movs into one, but even that isn't possible :-(
+ /* Don't use GL_DOT2_ADD_ATI here because we cannot configure it to read the blue and alpha
+ * component of the bump matrix. Instead do this with two MADs:
+ *
+ * coord.a = tex.r * bump.b + coord.g
+ * coord.g = tex.g * bump.a + coord.a
*
- * NOTE: GL_BLUE | GL_ALPHA is not possible. It doesn't throw a compilation error, but an OR operation on the
- * constants doesn't make sense, considering their values.
+ * The first instruction writes to alpha so it can be coissued with the above DOT2_ADD.
+ * coord.a is unused. If the perturbed texture is projected, this was already handled
+ * in the glPassTexCoordATI above.
*/
- wrap_op1(gl_info, GL_MOV_ATI, GL_REG_5_ATI, GL_RED_BIT_ATI, GL_NONE,
- ATI_FFP_CONST_BUMPMAT(stage), GL_BLUE, GL_NONE);
- wrap_op1(gl_info, GL_MOV_ATI, GL_REG_5_ATI, GL_GREEN_BIT_ATI, GL_NONE,
- ATI_FFP_CONST_BUMPMAT(stage), GL_ALPHA, GL_NONE);
- wrap_op3(gl_info, GL_DOT2_ADD_ATI, GL_REG_0_ATI + stage + 1, GL_GREEN_BIT_ATI, GL_NONE,
- GL_REG_0_ATI + stage, GL_NONE, argmodextra_y,
- GL_REG_5_ATI, GL_NONE, GL_2X_BIT_ATI | GL_BIAS_BIT_ATI,
+ wrap_op3(gl_info, GL_MAD_ATI, GL_REG_0_ATI + stage + 1, GL_ALPHA, GL_NONE,
+ GL_REG_0_ATI + stage, GL_RED, argmodextra_y,
+ ATI_FFP_CONST_BUMPMAT(stage), GL_BLUE, GL_NONE,
GL_REG_0_ATI + stage + 1, GL_GREEN, GL_NONE);
+ wrap_op3(gl_info, GL_MAD_ATI, GL_REG_0_ATI + stage + 1, GL_GREEN_BIT_ATI, GL_NONE,
+ GL_REG_0_ATI + stage, GL_GREEN, argmodextra_y,
+ ATI_FFP_CONST_BUMPMAT(stage), GL_ALPHA, GL_NONE,
+ GL_REG_0_ATI + stage + 1, GL_ALPHA, GL_NONE);
}
/* Pass 3: Generate sampling instructions for regular textures */
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