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/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef U_BLIT_H
#define U_BLIT_H
#include "pipe/p_defines.h"
#include "util/u_debug.h"
#ifdef __cplusplus
extern "C" {
#endif
static INLINE boolean u_validate_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);
break;
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_LINE_LOOP:
ok = (nr >= 2);
break;
case PIPE_PRIM_TRIANGLES:
ok = (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);
break;
case PIPE_PRIM_QUAD_STRIP:
ok = (nr >= 4);
break;
default:
ok = 0;
break;
}
return ok;
}
static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
{
boolean ok = TRUE;
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;
return ok;
}
static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
{
switch (pipe_prim) {
case PIPE_PRIM_POINTS:
return PIPE_PRIM_POINTS;
case PIPE_PRIM_LINES:
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_LINE_LOOP:
return PIPE_PRIM_LINES;
default:
return PIPE_PRIM_TRIANGLES;
}
}
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
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