#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;
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;
}
}
+/**
+ * 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