87 lines
2.4 KiB
GLSL
87 lines
2.4 KiB
GLSL
/* clang-format off */
|
|
[vertex]
|
|
|
|
layout(location = 0) in highp vec4 vertex_attrib;
|
|
/* clang-format on */
|
|
|
|
void main() {
|
|
gl_Position = vertex_attrib;
|
|
}
|
|
|
|
/* clang-format off */
|
|
[fragment]
|
|
|
|
uniform highp sampler2D source_exposure; //texunit:0
|
|
/* clang-format on */
|
|
|
|
#ifdef EXPOSURE_BEGIN
|
|
|
|
uniform highp ivec2 source_render_size;
|
|
uniform highp ivec2 target_size;
|
|
|
|
#endif
|
|
|
|
#ifdef EXPOSURE_END
|
|
|
|
uniform highp sampler2D prev_exposure; //texunit:1
|
|
uniform highp float exposure_adjust;
|
|
uniform highp float min_luminance;
|
|
uniform highp float max_luminance;
|
|
|
|
#endif
|
|
|
|
layout(location = 0) out highp float exposure;
|
|
|
|
void main() {
|
|
#ifdef EXPOSURE_BEGIN
|
|
|
|
ivec2 src_pos = ivec2(gl_FragCoord.xy) * source_render_size / target_size;
|
|
|
|
#if 1
|
|
//more precise and expensive, but less jittery
|
|
ivec2 next_pos = (ivec2(gl_FragCoord.xy) + ivec2(1)) * source_render_size / target_size;
|
|
next_pos = max(next_pos, src_pos + ivec2(1)); //so it at least reads one pixel
|
|
highp vec3 source_color = vec3(0.0);
|
|
for (int i = src_pos.x; i < next_pos.x; i++) {
|
|
for (int j = src_pos.y; j < next_pos.y; j++) {
|
|
source_color += texelFetch(source_exposure, ivec2(i, j), 0).rgb;
|
|
}
|
|
}
|
|
|
|
source_color /= float((next_pos.x - src_pos.x) * (next_pos.y - src_pos.y));
|
|
#else
|
|
highp vec3 source_color = texelFetch(source_exposure, src_pos, 0).rgb;
|
|
|
|
#endif
|
|
|
|
exposure = max(source_color.r, max(source_color.g, source_color.b));
|
|
|
|
#else
|
|
|
|
ivec2 coord = ivec2(gl_FragCoord.xy);
|
|
exposure = texelFetch(source_exposure, coord * 3 + ivec2(0, 0), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(1, 0), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(2, 0), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(0, 1), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(1, 1), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(2, 1), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(0, 2), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(1, 2), 0).r;
|
|
exposure += texelFetch(source_exposure, coord * 3 + ivec2(2, 2), 0).r;
|
|
exposure *= (1.0 / 9.0);
|
|
|
|
#ifdef EXPOSURE_END
|
|
|
|
#ifdef EXPOSURE_FORCE_SET
|
|
//will stay as is
|
|
#else
|
|
highp float prev_lum = texelFetch(prev_exposure, ivec2(0, 0), 0).r; //1 pixel previous exposure
|
|
exposure = clamp(prev_lum + (exposure - prev_lum) * exposure_adjust, min_luminance, max_luminance);
|
|
|
|
#endif //EXPOSURE_FORCE_SET
|
|
|
|
#endif //EXPOSURE_END
|
|
|
|
#endif //EXPOSURE_BEGIN
|
|
}
|