itsmattkc
1d61f89920
- Abstracts all OpenGL functionality including UI objects - Cleans up several rendering codepaths - Improves threading functionality - Removes old code and problematic functions
36 lines
955 B
GLSL
36 lines
955 B
GLSL
#version 150
|
|
|
|
uniform sampler2D ove_maintex;
|
|
uniform vec2 viewport;
|
|
uniform float histogram_scale;
|
|
|
|
in vec2 ove_texcoord;
|
|
|
|
out vec4 fragColor;
|
|
|
|
void main(void) {
|
|
float histogram_width = ceil(histogram_scale * viewport.y);
|
|
float quantisation = 1.0 / (histogram_width - 1.0);
|
|
vec3 cur_col = vec3(0.0);
|
|
vec3 sum = vec3(0.0);
|
|
float ratio = 0.0;
|
|
|
|
for (int i = 0; i < histogram_width; i++) {
|
|
ratio = float(i) / float(histogram_width - 1);
|
|
cur_col = texture(
|
|
ove_maintex,
|
|
vec2(ove_texcoord.y, ratio)
|
|
).rgb;
|
|
|
|
sum += step(vec3(ove_texcoord.x - quantisation), cur_col) *
|
|
step(cur_col, vec3(ove_texcoord.x + quantisation)) +
|
|
(
|
|
// Account for values beyond the upper x limit.
|
|
step(1.0 - quantisation, ove_texcoord.x) *
|
|
step(vec3(1.0 - quantisation), cur_col)
|
|
);
|
|
}
|
|
|
|
fragColor = vec4(sum, 1.0);
|
|
}
|