andras/decla-red
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Add basic tiled rendering

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schmelczerandras 2020-07-27 22:53:17 +02:00
commit edffd22c2e
1 changed files with 353 additions and 170 deletions
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48
frontend/src/shaders/cave-distance-fs.glsl
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@ -2,36 +2,46 @@
precision mediump float;
#define INFINITY 200.0
#define LINES_ENABLED {linesEnabled}
#define LINE_COUNT {lineCount}
#define CAVE_COLOR vec3(0.36, 0.38, 0.76)
#define AIR_COLOR vec3(0.7)
#define DISTANCE_SCALE {distanceScale}
// start, end - start
uniform vec2[LINE_COUNT * 2] lines;
// startRadius, endRadois
uniform float[LINE_COUNT * 2] radii;
uniform float maxMinDistance;
#if LINES_ENABLED
// start, end - start
uniform vec2[LINE_COUNT * 2] lines;
// startRadius, endRadois
uniform float[LINE_COUNT * 2] radii;
#endif
in vec2 worldCoordinates;
out vec4 fragmentColor;
void main() {
float minDistance = INFINITY;
#if LINES_ENABLED
float minDistance = maxMinDistance;
for (int i = 0; i < LINE_COUNT; i++) {
vec2 pa = worldCoordinates - lines[2 * i];
vec2 ba = lines[2 * i + 1];
float baLength = length(ba);
float h = clamp(dot(pa / baLength, ba / baLength), 0.0, 1.0);
float lineDistance = distance(pa, ba * h) - mix(radii[2 * i], radii[2 * i + 1], h);
for (int i = 0; i < LINE_COUNT; i++) {
vec2 pa = worldCoordinates - lines[2 * i];
vec2 ba = lines[2 * i + 1];
float baLength = length(ba);
// todo: do we really want this dot(pa / baLength, ba / baLength)
float h = clamp(dot(pa / baLength, ba / baLength), 0.0, 1.0);
float lineDistance = distance(pa, ba * h) - mix(radii[2 * i], radii[2 * i + 1], h);
minDistance = min(minDistance, lineDistance);
}
minDistance = min(minDistance, lineDistance);
}
float distance = -minDistance;
fragmentColor = vec4(
mix(CAVE_COLOR, AIR_COLOR, clamp(distance, -10.0, 0.0) / 10.0 + 1.0),
distance / DISTANCE_SCALE
);
float distance = -minDistance;
fragmentColor = vec4(
mix(CAVE_COLOR, AIR_COLOR, clamp(distance, -10.0, 0.0) / 10.0 + 1.0),
distance / DISTANCE_SCALE
);
#else
fragmentColor = vec4(AIR_COLOR, maxMinDistance / DISTANCE_SCALE);
#endif
}