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swrast: remove unused compute_coveragei() function

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Brian Paul 2010-03-17 08:41:47 -06:00
parent a29c7948d9
commit 3828910d0e
1 changed files with 0 additions and 82 deletions
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82
src/mesa/swrast/s_aatriangle.c
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@ -268,88 +268,6 @@ compute_coveragef(const GLfloat v0[3], const GLfloat v1[3],
/*
* Compute how much (area) of the given pixel is inside the triangle.
* Vertices MUST be specified in counter-clockwise order.
* Return: coverage in [0, 15].
*/
static GLint
compute_coveragei(const GLfloat v0[3], const GLfloat v1[3],
const GLfloat v2[3], GLint winx, GLint winy)
{
/* NOTE: 15 samples instead of 16. */
static const GLfloat samples[15][2] = {
/* start with the four corners */
{ POS(0, 2), POS(0, 0) },
{ POS(3, 3), POS(0, 2) },
{ POS(0, 0), POS(3, 1) },
{ POS(3, 1), POS(3, 3) },
/* continue with interior samples */
{ POS(1, 1), POS(0, 1) },
{ POS(2, 0), POS(0, 3) },
{ POS(0, 3), POS(1, 3) },
{ POS(1, 2), POS(1, 0) },
{ POS(2, 3), POS(1, 2) },
{ POS(3, 2), POS(1, 1) },
{ POS(0, 1), POS(2, 2) },
{ POS(1, 0), POS(2, 1) },
{ POS(2, 1), POS(2, 3) },
{ POS(3, 0), POS(2, 0) },
{ POS(1, 3), POS(3, 0) }
};
const GLfloat x = (GLfloat) winx;
const GLfloat y = (GLfloat) winy;
const GLfloat dx0 = v1[0] - v0[0];
const GLfloat dy0 = v1[1] - v0[1];
const GLfloat dx1 = v2[0] - v1[0];
const GLfloat dy1 = v2[1] - v1[1];
const GLfloat dx2 = v0[0] - v2[0];
const GLfloat dy2 = v0[1] - v2[1];
GLint stop = 4, i;
GLint insideCount = 15;
#ifdef DEBUG
{
const GLfloat area = dx0 * dy1 - dx1 * dy0;
ASSERT(area >= 0.0);
}
#endif
for (i = 0; i < stop; i++) {
const GLfloat sx = x + samples[i][0];
const GLfloat sy = y + samples[i][1];
const GLfloat fx0 = sx - v0[0];
const GLfloat fy0 = sy - v0[1];
const GLfloat fx1 = sx - v1[0];
const GLfloat fy1 = sy - v1[1];
const GLfloat fx2 = sx - v2[0];
const GLfloat fy2 = sy - v2[1];
/* cross product determines if sample is inside or outside each edge */
GLfloat cross0 = (dx0 * fy0 - dy0 * fx0);
GLfloat cross1 = (dx1 * fy1 - dy1 * fx1);
GLfloat cross2 = (dx2 * fy2 - dy2 * fx2);
/* Check if the sample is exactly on an edge. If so, let cross be a
* positive or negative value depending on the direction of the edge.
*/
if (cross0 == 0.0F)
cross0 = dx0 + dy0;
if (cross1 == 0.0F)
cross1 = dx1 + dy1;
if (cross2 == 0.0F)
cross2 = dx2 + dy2;
if (cross0 < 0.0F || cross1 < 0.0F || cross2 < 0.0F) {
/* point is outside triangle */
insideCount--;
stop = 15;
}
}
if (stop == 4)
return 15;
else
return insideCount;
}
static void
rgba_aa_tri(GLcontext *ctx,
const SWvertex *v0,