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optimize earlyz_quad(), add comments, remove unneeded #includes

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This commit is contained in:
Brian 2007-11-19 18:16:07 -07:00
parent 0204cbb4f1
commit c4f9fbb57f
1 changed files with 13 additions and 21 deletions
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34
src/mesa/pipe/softpipe/sp_quad_earlyz.c
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@ -31,38 +31,30 @@
#include "pipe/p_defines.h"
#include "pipe/p_util.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "sp_tile_cache.h"
/**
* All this stage does is compute the quad's Z values (which is normally
* done by the shading stage).
* The next stage will do the actual depth test.
*/
static void
earlyz_quad(
struct quad_stage *qs,
struct quad_header *quad )
{
uint i;
const float fx = (float) quad->x0;
const float fy = (float) quad->y0;
float xy[4][2];
const float dzdx = quad->coef[0].dadx[2];
const float dzdy = quad->coef[0].dady[2];
const float z0 = quad->coef[0].a0[2] + dzdx * fx + dzdy * fy;
xy[0][0] = fx;
xy[1][0] = fx + 1.0f;
xy[2][0] = fx;
xy[3][0] = fx + 1.0f;
xy[0][1] = fy;
xy[1][1] = fy;
xy[2][1] = fy + 1.0f;
xy[3][1] = fy + 1.0f;
for (i = 0; i < QUAD_SIZE; i++) {
quad->outputs.depth[i] =
quad->coef[0].a0[2] +
quad->coef[0].dadx[2] * xy[i][0] +
quad->coef[0].dady[2] * xy[i][1];
}
quad->outputs.depth[0] = z0;
quad->outputs.depth[1] = z0 + dzdx;
quad->outputs.depth[2] = z0 + dzdy;
quad->outputs.depth[3] = z0 + dzdx + dzdy;
if (qs->next) {
qs->next->run( qs->next, quad );