wined3d: Optimize the projected bump map handling.

dlls/wined3d/arb_program_shader.c

@@ -2790,25 +2790,22 @@ static GLuint gen_arbfp_ffp_shader(struct ffp_settings *settings, IWineD3DStateB
             shader_addline(&buffer, "DP3 ret.g, arg1, tex%u;\n", stage - 1);
 
             /* with projective textures, texbem only divides the static texture coord, not the displacement,
-             * so we can't let the GL handle this.
+             * so multiply the displacement with the dividing parameter before passing it to TXP
              */
             if (settings->op[stage].projected != proj_none) {
-                /* Note: Currently always divide by .a because the vertex pipeline moves the correct value
-                 * into the 4th component
-                 */
                 if(settings->op[stage].projected == proj_count4) {
-                    shader_addline(&buffer, "RCP arg1.a, fragment.texcoord[%u].a;\n", stage);
+                    shader_addline(&buffer, "MOV ret.a, fragment.texcoord[%u].a;\n", stage);
+                    shader_addline(&buffer, "MUL ret.rgb, ret, fragment.texcoord[%u].a, fragment.texcoord[%u];\n", stage, stage);
                 } else {
-                    shader_addline(&buffer, "RCP arg1.a, fragment.texcoord[%u].b;\n", stage);
+                    shader_addline(&buffer, "MOV ret.a, fragment.texcoord[%u].b;\n", stage);
+                    shader_addline(&buffer, "MAD ret.rgb, ret, fragment.texcoord[%u].b, fragment.texcoord[%u];\n", stage, stage);
                 }
-                shader_addline(&buffer, "MUL arg1.rg, fragment.texcoord[%u], arg1.a;\n", stage);
-                shader_addline(&buffer, "ADD ret, ret, arg1;\n");
             } else {
                 shader_addline(&buffer, "ADD ret, ret, fragment.texcoord[%u];\n", stage);
             }
 
-            shader_addline(&buffer, "TEX%s tex%u, ret, texture[%u], %s;\n",
-                            sat, stage, stage, textype);
+            shader_addline(&buffer, "%s%s tex%u, ret, texture[%u], %s;\n",
+                           instr, sat, stage, stage, textype);
             if(settings->op[stage - 1].cop == WINED3DTOP_BUMPENVMAPLUMINANCE) {
                 shader_addline(&buffer, "MAD_SAT ret.r, tex%u.b, luminance%u.r, luminance%u.g;\n",
                                stage - 1, stage - 1, stage - 1);