r600g: fix linear and flat interpolation

[mesa.git] / src / gallium / auxiliary / util / u_prim.h

diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
index a9b533eea700458bf512607aa8b5fd9f29c4ce7f..070df643d2c18edf8c3b2e9d5786f765b16d4379 100644 (file)
--- a/src/gallium/auxiliary/util/u_prim.h
+++ b/src/gallium/auxiliary/util/u_prim.h
@@ -30,12 +30,13 @@
 #define U_BLIT_H
 
 
+#include "pipe/p_defines.h"
+#include "util/u_debug.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "pipe/p_defines.h"
-
 static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
 {
    boolean ok = TRUE;
@@ -77,41 +78,32 @@ static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
 static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
 {
    boolean ok = TRUE;
-
-   switch (pipe_prim) {
-   case PIPE_PRIM_POINTS:
-      ok = (*nr >= 1);
-      break;
-   case PIPE_PRIM_LINES:
-      ok = (*nr >= 2);
-      *nr -= (*nr % 2);
-      break;
-   case PIPE_PRIM_LINE_STRIP:
-   case PIPE_PRIM_LINE_LOOP:
-      ok = (*nr >= 2);
-      break;
-   case PIPE_PRIM_TRIANGLES:
-      ok = (*nr >= 3);
-      *nr -= (*nr % 3);
-      break;
-   case PIPE_PRIM_TRIANGLE_STRIP:
-   case PIPE_PRIM_TRIANGLE_FAN:
-   case PIPE_PRIM_POLYGON:
-      ok = (*nr >= 3);
-      break;
-   case PIPE_PRIM_QUADS:
-      ok = (*nr >= 4);
-      *nr -= (*nr % 4);
-      break;
-   case PIPE_PRIM_QUAD_STRIP:
-      ok = (*nr >= 4);
-      *nr -= (*nr % 2);
-      break;
-   default:
-      ok = 0;
-      break;
+   const static unsigned values[][2] = {
+      { 1, 0 }, /* PIPE_PRIM_POINTS */
+      { 2, 2 }, /* PIPE_PRIM_LINES */
+      { 2, 0 }, /* PIPE_PRIM_LINE_LOOP */
+      { 2, 0 }, /* PIPE_PRIM_LINE_STRIP */
+      { 3, 3 }, /* PIPE_PRIM_TRIANGLES */
+      { 3, 0 }, /* PIPE_PRIM_TRIANGLE_STRIP */
+      { 3, 0 }, /* PIPE_PRIM_TRIANGLE_FAN */
+      { 4, 4 }, /* PIPE_PRIM_TRIANGLE_QUADS */
+      { 4, 2 }, /* PIPE_PRIM_TRIANGLE_QUAD_STRIP */
+      { 3, 0 }, /* PIPE_PRIM_TRIANGLE_POLYGON */
+      { 4, 4 }, /* PIPE_PRIM_LINES_ADJACENCY */
+      { 4, 0 }, /* PIPE_PRIM_LINE_STRIP_ADJACENCY */
+      { 6, 5 }, /* PIPE_PRIM_TRIANGLES_ADJACENCY */
+      { 4, 0 }, /* PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY */
+   };
+
+   if (unlikely(pipe_prim >= PIPE_PRIM_MAX)) {
+       *nr = 0;
+       return FALSE;
    }
 
+   ok = (*nr >= values[pipe_prim][0]);
+   if (values[pipe_prim][1])
+       *nr -= (*nr % values[pipe_prim][1]);
+
    if (!ok)
       *nr = 0;
 
@@ -135,4 +127,85 @@ static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
    }
 }
 
+static INLINE unsigned
+u_vertices_per_prim(int primitive)
+{
+   switch(primitive) {
+   case PIPE_PRIM_POINTS:
+      return 1;
+   case PIPE_PRIM_LINES:
+   case PIPE_PRIM_LINE_LOOP:
+   case PIPE_PRIM_LINE_STRIP:
+      return 2;
+   case PIPE_PRIM_TRIANGLES:
+   case PIPE_PRIM_TRIANGLE_STRIP:
+   case PIPE_PRIM_TRIANGLE_FAN:
+      return 3;
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return 4;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return 6;
+
+   /* following primitives should never be used
+    * with geometry shaders abd their size is
+    * undefined */
+   case PIPE_PRIM_POLYGON:
+   case PIPE_PRIM_QUADS:
+   case PIPE_PRIM_QUAD_STRIP:
+   default:
+      debug_printf("Unrecognized geometry shader primitive");
+      return 3;
+   }
+}
+
+/**
+ * Returns the number of decomposed primitives for the given
+ * vertex count.
+ * Geometry shader is invoked once for each triangle in
+ * triangle strip, triangle fans and triangles and once
+ * for each line in line strip, line loop, lines.
+ */
+static INLINE unsigned
+u_gs_prims_for_vertices(int primitive, int vertices)
+{
+   switch(primitive) {
+   case PIPE_PRIM_POINTS:
+      return vertices;
+   case PIPE_PRIM_LINES:
+      return vertices / 2;
+   case PIPE_PRIM_LINE_LOOP:
+      return vertices;
+   case PIPE_PRIM_LINE_STRIP:
+      return vertices - 1;
+   case PIPE_PRIM_TRIANGLES:
+      return vertices /  3;
+   case PIPE_PRIM_TRIANGLE_STRIP:
+      return vertices - 2;
+   case PIPE_PRIM_TRIANGLE_FAN:
+      return vertices - 2;
+   case PIPE_PRIM_LINES_ADJACENCY:
+      return vertices / 2;
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return vertices - 1;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+      return vertices / 3;
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return vertices - 2;
+
+   /* following primitives should never be used
+    * with geometry shaders abd their size is
+    * undefined */
+   case PIPE_PRIM_POLYGON:
+   case PIPE_PRIM_QUADS:
+   case PIPE_PRIM_QUAD_STRIP:
+   default:
+      debug_printf("Unrecognized geometry shader primitive");
+      return 3;
+   }
+}
+
+const char *u_prim_name( unsigned pipe_prim );
+
 #endif