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Ray-caster: only draw the top few fragments

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This seems to increase graphics pipe use from 50--60% to 55--65%.
This commit is contained in:
Aaron Fenyes 2024-08-29 15:01:38 -07:00
parent 6db9f5be6c
commit f148552964
1 changed files with 17 additions and 14 deletions
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31
app-proto/inversive-display/src/inversive.frag
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@ -25,10 +25,10 @@ vecInv sphere(vec3 center, float radius) {
// construction. the SPHERE_MAX array size seems to affect frame rate a lot,
// even though we should only be using the first few elements of each array
const int SPHERE_MAX_UNIFORM = 200;
const int SPHERE_MAX = 200;
uniform int sphere_cnt;
uniform vecInv sphere_list[SPHERE_MAX_UNIFORM];
uniform vec3 color_list[SPHERE_MAX_UNIFORM];
uniform vecInv sphere_list[SPHERE_MAX];
uniform vec3 color_list[SPHERE_MAX];
// view
uniform vec2 resolution;
@ -135,8 +135,8 @@ void main() {
vec3 dir = vec3(focal_slope * scr, -1.);
// cast rays through the spheres
const int SPHERE_MAX_INTERNAL = 6;
taggedFrag frags [2*SPHERE_MAX_INTERNAL];
const int LAYER_MAX = 12;
taggedFrag frags [LAYER_MAX];
int layer_cnt = 0;
for (int id = 0; id < sphere_cnt; ++id) {
// find out where the ray hits the sphere
@ -144,17 +144,20 @@ void main() {
// insertion-sort the fragments we hit into the fragment list
for (int side = 0; side < 2; ++side) {
if (hit_depths[side] > 0.) {
float hit_z = -hit_depths[side];
if (0. > hit_z) {
for (int layer = layer_cnt; layer >= 0; --layer) {
if (layer < 1 || frags[layer-1].pt.z >= -hit_depths[side]) {
if (layer < 1 || frags[layer-1].pt.z >= hit_z) {
// we're not as close to the screen as the fragment
// before the empty slot, so insert here
frags[layer] = sphere_shading(
sphere_list[id],
hit_depths[side] * dir,
color_list[id],
id
);
if (layer < LAYER_MAX) {
frags[layer] = sphere_shading(
sphere_list[id],
hit_depths[side] * dir,
color_list[id],
id
);
}
break;
} else {
// we're closer to the screen than the fragment before
@ -163,7 +166,7 @@ void main() {
frags[layer] = frags[layer-1];
}
}
++layer_cnt;
layer_cnt = min(layer_cnt + 1, LAYER_MAX);
}
}
}