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fixed AA sampling problem, misc clean-up

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This commit is contained in:
Brian Paul 2000-07-15 03:13:43 +00:00
parent 3284b5ddba
commit 6fae9eb4b4
1 changed files with 57 additions and 36 deletions
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69
src/mesa/main/points.c
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@ -1,4 +1,4 @@
/* $Id: points.c,v 1.10 2000/06/28 23:11:10 brianp Exp $ */
/* $Id: points.c,v 1.11 2000/07/15 03:13:43 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -521,6 +521,17 @@ multitextured_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
}
/*
* NOTES on aa point rasterization:
*
* Let d = distance of fragment center from vertex.
* if d < rmin2 then
* fragment has 100% coverage
* else if d > rmax2 then
* fragment has 0% coverage
* else
* fragement has % coverage = (d - rmin2) / (rmax2 - rmin2)
*/
/*
@ -534,7 +545,7 @@ antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
const GLfloat radius = ctx->Point.Size * 0.5F;
const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */
const GLfloat rmax = radius + 0.7071F;
const GLfloat rmin2 = rmin * rmin;
const GLfloat rmin2 = MAX2(0.0, rmin * rmin);
const GLfloat rmax2 = rmax * rmax;
const GLfloat cscale = 256.0F / (rmax2 - rmin2);
GLuint i;
@ -546,11 +557,13 @@ antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
GLint red, green, blue, alpha;
GLfloat s, t, u;
GLfloat s1, t1, u1;
GLfloat vx = VB->Win.data[i][0];
GLfloat vy = VB->Win.data[i][1];
GLint xmin = (GLint) (VB->Win.data[i][0] - radius);
GLint xmax = (GLint) (VB->Win.data[i][0] + radius);
GLint ymin = (GLint) (VB->Win.data[i][1] - radius);
GLint ymax = (GLint) (VB->Win.data[i][1] + radius);
GLint xmin = (GLint) (vx - radius);
GLint xmax = (GLint) (vx + radius);
GLint ymin = (GLint) (vy - radius);
GLint ymax = (GLint) (vy + radius);
GLint z = (GLint) (VB->Win.data[i][2] + ctx->PointZoffset);
red = VB->ColorPtr->data[i][0];
@ -621,11 +634,15 @@ antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
}
}
/* translate by a half pixel to simplify math below */
vx -= 0.5F;
vx -= 0.5F;
for (y = ymin; y <= ymax; y++) {
for (x = xmin; x <= xmax; x++) {
GLfloat dx = x/*+0.5F*/ - VB->Win.data[i][0];
GLfloat dy = y/*+0.5F*/ - VB->Win.data[i][1];
GLfloat dist2 = dx*dx + dy*dy;
const GLfloat dx = x - vx;
const GLfloat dy = y - vy;
const GLfloat dist2 = dx*dx + dy*dy;
if (dist2 < rmax2) {
alpha = VB->ColorPtr->data[i][3];
if (dist2 >= rmin2) {
@ -656,21 +673,25 @@ antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
GLint x, y, z;
GLint red, green, blue, alpha;
xmin = (GLint) (VB->Win.data[i][0] - radius);
xmax = (GLint) (VB->Win.data[i][0] + radius);
ymin = (GLint) (VB->Win.data[i][1] - radius);
ymax = (GLint) (VB->Win.data[i][1] + radius);
xmin = (GLint) (VB->Win.data[i][0] - 0.0 - radius);
xmax = (GLint) (VB->Win.data[i][0] - 0.0 + radius);
ymin = (GLint) (VB->Win.data[i][1] - 0.0 - radius);
ymax = (GLint) (VB->Win.data[i][1] - 0.0 + radius);
z = (GLint) (VB->Win.data[i][2] + ctx->PointZoffset);
red = VB->ColorPtr->data[i][0];
green = VB->ColorPtr->data[i][1];
blue = VB->ColorPtr->data[i][2];
/*
printf("point %g, %g\n", VB->Win.data[i][0], VB->Win.data[i][1]);
printf("%d..%d X %d..%d\n", xmin, xmax, ymin, ymax);
*/
for (y = ymin; y <= ymax; y++) {
for (x = xmin; x <= xmax; x++) {
GLfloat dx = x/*+0.5F*/ - VB->Win.data[i][0];
GLfloat dy = y/*+0.5F*/ - VB->Win.data[i][1];
GLfloat dist2 = dx*dx + dy*dy;
const GLfloat dx = x + 0.5F - VB->Win.data[i][0];
const GLfloat dy = y + 0.5F - VB->Win.data[i][1];
const GLfloat dist2 = dx*dx + dy*dy;
if (dist2 < rmax2) {
alpha = VB->ColorPtr->data[i][3];
if (dist2 >= rmin2) {
@ -1104,7 +1125,7 @@ dist_atten_antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
}
rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */
rmax = radius + 0.7071F;
rmin2 = rmin*rmin;
rmin2 = MAX2(0.0, rmin * rmin);
rmax2 = rmax * rmax;
cscale = 256.0F / (rmax2 - rmin2);
@ -1184,9 +1205,9 @@ dist_atten_antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
for (y = ymin; y <= ymax; y++) {
for (x = xmin; x <= xmax; x++) {
GLfloat dx = x/*+0.5F*/ - VB->Win.data[i][0];
GLfloat dy = y/*+0.5F*/ - VB->Win.data[i][1];
GLfloat dist2 = dx*dx + dy*dy;
const GLfloat dx = x + 0.5F - VB->Win.data[i][0];
const GLfloat dy = y + 0.5F - VB->Win.data[i][1];
const GLfloat dist2 = dx*dx + dy*dy;
if (dist2 < rmax2) {
alpha = VB->ColorPtr->data[i][3];
if (dist2 >= rmin2) {
@ -1230,7 +1251,7 @@ dist_atten_antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
}
rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */
rmax = radius + 0.7071F;
rmin2 = rmin * rmin;
rmin2 = MAX2(0.0, rmin * rmin);
rmax2 = rmax * rmax;
cscale = 256.0F / (rmax2 - rmin2);
@ -1246,9 +1267,9 @@ dist_atten_antialiased_rgba_points( GLcontext *ctx, GLuint first, GLuint last )
for (y = ymin; y <= ymax; y++) {
for (x = xmin; x <= xmax; x++) {
GLfloat dx = x/*+0.5F*/ - VB->Win.data[i][0];
GLfloat dy = y/*+0.5F*/ - VB->Win.data[i][1];
GLfloat dist2 = dx * dx + dy * dy;
const GLfloat dx = x + 0.5F - VB->Win.data[i][0];
const GLfloat dy = y + 0.5F - VB->Win.data[i][1];
const GLfloat dist2 = dx * dx + dy * dy;
if (dist2 < rmax2) {
alpha = VB->ColorPtr->data[i][3];
if (dist2 >= rmin2) {