1 files changed, 62 insertions, 46 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_rast_tri.c b/src/gallium/drivers/llvmpipe/lp_rast_tri.c
index ebe9a8e92b..980c18c024 100644
--- a/src/gallium/drivers/llvmpipe/lp_rast_tri.c
+++ b/src/gallium/drivers/llvmpipe/lp_rast_tri.c
@@ -37,52 +37,6 @@
 #include "lp_tile_soa.h"
 
 
-/**
- * Map an index in [0,15] to an x,y position, multiplied by 4.
- * This is used to get the position of each subtile in a 4x4
- * grid of edge step values.
- * Note: we can use some bit twiddling to compute these values instead
- * of using a look-up table, but there's no measurable performance
- * difference.
- */
-static const int pos_table4[16][2] = {
-   { 0, 0 },
-   { 4, 0 },
-   { 0, 4 },
-   { 4, 4 },
-   { 8, 0 },
-   { 12, 0 },
-   { 8, 4 },
-   { 12, 4 },
-   { 0, 8 },
-   { 4, 8 },
-   { 0, 12 },
-   { 4, 12 },
-   { 8, 8 },
-   { 12, 8 },
-   { 8, 12 },
-   { 12, 12 }
-};
-
-
-static const int pos_table16[16][2] = {
-   { 0, 0 },
-   { 16, 0 },
-   { 0, 16 },
-   { 16, 16 },
-   { 32, 0 },
-   { 48, 0 },
-   { 32, 16 },
-   { 48, 16 },
-   { 0, 32 },
-   { 16, 32 },
-   { 0, 48 },
-   { 16, 48 },
-   { 32, 32 },
-   { 48, 32 },
-   { 32, 48 },
-   { 48, 48 }
-};
 
 
 /**
@@ -113,6 +67,68 @@ block_full_16(struct lp_rasterizer_task *task,
 	 block_full_4(task, tri, x + ix, y + iy);
 }
 
+
+static INLINE unsigned
+build_mask(int c, int dcdx, int dcdy)
+{
+   int mask = 0;
+
+   int c0 = c;
+   int c1 = c0 + dcdx;
+   int c2 = c1 + dcdx;
+   int c3 = c2 + dcdx;
+
+   mask |= ((c0 + 0 * dcdy) >> 31) & (1 << 0);
+   mask |= ((c0 + 1 * dcdy) >> 31) & (1 << 2);
+   mask |= ((c0 + 2 * dcdy) >> 31) & (1 << 8);
+   mask |= ((c0 + 3 * dcdy) >> 31) & (1 << 10);
+   mask |= ((c1 + 0 * dcdy) >> 31) & (1 << 1);
+   mask |= ((c1 + 1 * dcdy) >> 31) & (1 << 3);
+   mask |= ((c1 + 2 * dcdy) >> 31) & (1 << 9);
+   mask |= ((c1 + 3 * dcdy) >> 31) & (1 << 11); 
+   mask |= ((c2 + 0 * dcdy) >> 31) & (1 << 4);
+   mask |= ((c2 + 1 * dcdy) >> 31) & (1 << 6);
+   mask |= ((c2 + 2 * dcdy) >> 31) & (1 << 12);
+   mask |= ((c2 + 3 * dcdy) >> 31) & (1 << 14);
+   mask |= ((c3 + 0 * dcdy) >> 31) & (1 << 5);
+   mask |= ((c3 + 1 * dcdy) >> 31) & (1 << 7);
+   mask |= ((c3 + 2 * dcdy) >> 31) & (1 << 13);
+   mask |= ((c3 + 3 * dcdy) >> 31) & (1 << 15);
+  
+   return mask;
+}
+
+static INLINE unsigned
+build_mask_linear(int c, int dcdx, int dcdy)
+{
+   int mask = 0;
+
+   int c0 = c;
+   int c1 = c0 + dcdy;
+   int c2 = c1 + dcdy;
+   int c3 = c2 + dcdy;
+
+   mask |= ((c0 + 0 * dcdx) >> 31) & (1 << 0);
+   mask |= ((c0 + 1 * dcdx) >> 31) & (1 << 1);
+   mask |= ((c0 + 2 * dcdx) >> 31) & (1 << 2);
+   mask |= ((c0 + 3 * dcdx) >> 31) & (1 << 3);
+   mask |= ((c1 + 0 * dcdx) >> 31) & (1 << 4);
+   mask |= ((c1 + 1 * dcdx) >> 31) & (1 << 5);
+   mask |= ((c1 + 2 * dcdx) >> 31) & (1 << 6);
+   mask |= ((c1 + 3 * dcdx) >> 31) & (1 << 7); 
+   mask |= ((c2 + 0 * dcdx) >> 31) & (1 << 8);
+   mask |= ((c2 + 1 * dcdx) >> 31) & (1 << 9);
+   mask |= ((c2 + 2 * dcdx) >> 31) & (1 << 10);
+   mask |= ((c2 + 3 * dcdx) >> 31) & (1 << 11);
+   mask |= ((c3 + 0 * dcdx) >> 31) & (1 << 12);
+   mask |= ((c3 + 1 * dcdx) >> 31) & (1 << 13);
+   mask |= ((c3 + 2 * dcdx) >> 31) & (1 << 14);
+   mask |= ((c3 + 3 * dcdx) >> 31) & (1 << 15);
+  
+   return mask;
+}
+
+
 #define TAG(x) x##_1
 #define NR_PLANES 1
 #include "lp_rast_tri_tmp.h"