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RhythmGame
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line shader cleanup

This commit is contained in:
Luke Hubmayer-Werner 2020-12-20 00:10:00 +10:30
parent 867d0be356
commit 5b44ad125c
1 changed files with 20 additions and 41 deletions
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61
shaders/notelines.shader
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@ -3,6 +3,7 @@ render_mode blend_premul_alpha;
const float TAU = 6.283185307;
const float PI = 3.1415926536;
const float EPS = 0.00001;
uniform vec4 line_color : hint_color = vec4(0.8, 0.8, 1.0, 0.8);
uniform vec4 line_color_double : hint_color = vec4(1.0, 1.0, 0.6, 0.9);
@ -12,12 +13,11 @@ uniform float line_thickness = 0.012;
uniform float line_thickness_min = 0.0;
uniform float dot_thickness = 0.033;
uniform float dot_fullbright_thickness = 0.013;
uniform float max_angle = 1.0708; //3.14159*0.5; //radians(90.0);
uniform float max_angle = 1.5708; //1.0708; //3.14159*0.5; //radians(90.0);
uniform float max_dist = 1.25;
// GLES2 clamps our color values that we send as makeshift arrays, so we need to divide them in code and multiply them in our shader
uniform vec3 array_postmul = vec3(2.0, 8.0, 6.283185307);
uniform float cols_div2 = 3.999; // Used to determine opposed notes
//void vertex() {
//}
@ -56,6 +56,10 @@ vec3 array_get(sampler2D tex, int index) {
return texture(tex, vec2(x, y), -100.0).xyz * array_postmul;
}
float get_fringe_alpha(float radial_dist, float angular_dist) { // Branchless edition :)
float thickness = mix(line_thickness, line_thickness_min, angular_dist/max_angle) * float(angular_dist < max_angle);
return max(thickness-radial_dist, 0.0)/line_thickness;
}
void fragment() {
float dist = distance(UV, vec2(0.0));
@ -66,15 +70,15 @@ void fragment() {
// Iterate over all the notes and check distance to them
bool last_double = false;
for (int i=0; i<238; i++){
// x, y, z = distance, column, column_radians
int i_end = array_size - array_sidelen - 2;
for (int i=0; i<i_end; i++){
// x, y, z = radial distance, column, column_radians
vec3 sample = array_get(TEXTURE, i).xyz;
if (sample == vec3(0.0)) break;
float diff = abs(dist - sample.x);
// Short-circuit out if our radial difference is too high to matter in any case.
// We need the diff value calculated anyway so shouldn't add any overhead
// Assume dot_thickness is thickest uniform
if (diff > dot_thickness) continue;
float radial_dist = abs(dist - sample.x);
if (radial_dist > dot_thickness) continue;
// Check for dot distance
vec2 uv = sample.x * vec2(cos(sample.z), -sin(sample.z));
@ -96,49 +100,24 @@ void fragment() {
if (sample.x == sample2.x){
// This note is a double!
last_double = true;
// Check for special case: directly opposite columns - full-thickness line 360°
// if (sample.y == mod(sample2.y+4.0, 8.0)){
if (abs(sample.y-sample2.y) >= cols_div2){
if (diff < line_thickness){
line_double_alpha += (line_thickness-diff)/line_thickness;
}
} else {
// Find the smallest arc between them, make it fully thick
float diff_a2 = angle_diff(angle, sample2.z);
if ((diff_a+diff_a2-0.0001) <= angle_diff(sample.z, sample2.z)){
if (diff < line_thickness){
line_double_alpha += (line_thickness-diff)/line_thickness;
}
} else {
// Fringe
float diff_amin = min(diff_a, diff_a2);
if (diff_amin < max_angle){
float thickness = mix(line_thickness, line_thickness_min, diff_amin/max_angle);
if (diff < thickness){
line_double_alpha += (thickness-diff)/line_thickness;
}
}
}
}
} else {
if (diff_a < max_angle){
float thickness = mix(line_thickness, line_thickness_min, diff_a/max_angle);
if (diff < thickness){
line_alpha += (thickness-diff)/line_thickness;
}
}
float double_diff = angle_diff(sample.z, sample2.z);
// Find the smallest arc between them, make it fully thick. If they are directly opposite, this will go 360°
float diff_a2 = angle_diff(angle, sample2.z);
bool fullthick = (diff_a+diff_a2-EPS) <= min(double_diff, PI-EPS); // Branchless logic
line_double_alpha += ((line_thickness-radial_dist)/line_thickness) * float(radial_dist < line_thickness) * float(fullthick);
line_double_alpha += get_fringe_alpha(radial_dist, min(diff_a, diff_a2)) * float(!fullthick);
} else { // Just a regular single, fringing line only
line_alpha += get_fringe_alpha(radial_dist, diff_a);
}
}
// Draw release dots
int i_start = array_size - array_sidelen;
for (int i=i_start; i<array_size; i++){
for (int i=array_size - array_sidelen; i<array_size; i++){
vec3 sample = array_get(TEXTURE, i).xyz;
if (sample == vec3(0.0)) break;
vec2 uv = sample.x * vec2(cos(sample.z), -sin(sample.z));
float dist2 = distance(UV, uv);
if (dist2 < dot_thickness){
//dot_alpha += (dot_thickness-dist2)/dot_thickness;
float w = dot_thickness - dot_fullbright_thickness;
dot_alpha += (w-max(dist2-dot_fullbright_thickness, 0.0))/w;
}