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This commit is contained in:
Simon Schneegans
2022-01-01 21:18:49 +01:00
parent 5d845e09c1
commit 37cd1fb7cc
1 changed files with 60 additions and 48 deletions
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src/extension/TRexShader.js
+60 -48
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@@ -27,8 +27,9 @@ var TRexShader = GObject.registerClass({Properties: {}, Signals: {}},
_init(settings) {
super._init({shader_type: Clutter.ShaderType.FRAGMENT_SHADER});
// Load the font texture. As the shader is re-created for each window animation, this
// Load the claw texture. As the shader is re-created for each window animation, this
// texture is also re-created each time. This could be improved in the future!
// See assets/README.md for how this texture was created.
const clawData = GdkPixbuf.Pixbuf.new_from_resource('/img/claws.png');
this._clawTexture = new Clutter.Image();
this._clawTexture.set_data(
@@ -37,94 +38,105 @@ var TRexShader = GObject.registerClass({Properties: {}, Signals: {}},
const color = Clutter.Color.from_string(settings.get_string('claw-scratch-color'))[1];
// This is partially based on https://www.shadertoy.com/view/ldccW4 (CC-BY-NC-SA).
this.set_shader_source(`
// Inject some common shader snippets.
${shaderSnippets.standardUniforms()}
${shaderSnippets.noise()}
// See assets/README.md for how this texture was created.
uniform sampler2D uClawTexture;
const vec2 SEED = vec2(${Math.random()}, ${Math.random()});
const vec2 SEED = vec2(${Math.random()}, ${Math.random()});
const float CLAW_SIZE = ${settings.get_double('claw-scratch-scale')};
const float NUM_CLAWS = ${settings.get_int('claw-scratch-count')};
const float WARP_INTENSITY = 1.0 + ${settings.get_double('claw-scratch-warp')};
const float FLASH_INTENSITY = 0.1;
const float MAX_SPAWN_TIME = 0.5; // Scratches will only start in the first half of the animation.
const float FF_TIME = 0.5; // Relative time for the final fade to transparency.
vec2 getClawUV(vec2 texCoords, float globalScale, vec2 seed) {
// This method generates a grid of randomly rotated, slightly shifted and scaled
// UV squares. It returns the texture coords of the UV square at the given actor
// coordinates. If these do not fall into one of the UV grids, the coordinates of
// the closest UV grid will be clamped and returned.
vec2 getClawUV(vec2 texCoords, float gridScale, vec2 seed) {
// Shift coordinates by a random offset and make sure the have a 1:1 aspect ratio.
vec2 coords = texCoords + rand2(seed);
coords *= uSizeX < uSizeY ? vec2(1.0, 1.0 * uSizeY / uSizeX) : vec2(1.0 * uSizeX / uSizeY, 1.0);
coords *= globalScale;
// Apply global scale.
coords *= gridScale;
vec2 uv = mod(coords, vec2(1));
vec2 block = coords-uv + vec2(362.456);
// Get grid cell coordinates in [0..1].
vec2 cellUV = mod(coords, vec2(1));
float scale = mix(0.8, 1.0, rand(block*seed*134.451));
float offsetX = mix(0.0, 1.0 - scale, rand(block*seed*54.4129));
float offsetY = mix(0.0, 1.0 - scale, rand(block*seed*25.3089));
float rotation = mix(0.0, 2.0 * 3.141, rand(block*seed*2.99837));
// This is unique for each cell.
vec2 cellID = coords-cellUV + vec2(362.456);
// Add random rotation, scale and offset to each grid cell.
float scale = mix(0.8, 1.0, rand(cellID*seed*134.451));
float offsetX = mix(0.0, 1.0 - scale, rand(cellID*seed*54.4129));
float offsetY = mix(0.0, 1.0 - scale, rand(cellID*seed*25.3089));
float rotation = mix(0.0, 2.0 * 3.141, rand(cellID*seed*2.99837));
uv -= vec2(offsetX, offsetY);
uv /= scale;
cellUV -= vec2(offsetX, offsetY);
cellUV /= scale;
uv -= 0.5;
uv = vec2(uv.x * cos(rotation) - uv.y * sin(rotation),
uv.x * sin(rotation) + uv.y * cos(rotation));
uv += 0.5;
cellUV -= 0.5;
cellUV = vec2(cellUV.x * cos(rotation) - cellUV.y * sin(rotation),
cellUV.x * sin(rotation) + cellUV.y * cos(rotation));
cellUV += 0.5;
return clamp(uv, vec2(0), vec2(1));
// Clamp resulting coordinates.
return clamp(cellUV, vec2(0), vec2(1));
}
void main() {
const float CLAW_SIZE = ${settings.get_double('claw-scratch-scale')};
const float NUM_CLAWS = ${settings.get_int('claw-scratch-count')};
const float WARP_INTENSITY = 1.0 + ${settings.get_double('claw-scratch-warp')};
const float FLASH_INTENSITY = 0.1;
const float MAX_SPAWN_TIME = 0.5;
const float FF_TIME = 0.5; // Relative time for the final fade to transparency.
float fade = smoothstep(0, 1, 1 - clamp((uProgress - 1.0 + FF_TIME)/FF_TIME, 0, 1));
float mask = 1.0;
// Warp the texture coordinates to create a blow-up effect.
vec2 coords = cogl_tex_coord_in[0].st * 2.0 - 1.0;
float dist = length(coords);
coords = (coords/dist * pow(dist, WARP_INTENSITY)) * 0.5 + 0.5;
coords = mix(cogl_tex_coord_in[0].st, coords, uProgress);
// Accumulate several random scratches. The color in the scratch map refers to the
// relative time when the respective part will become invisible. Therefore we can
// add a value to make the scratch appear later.
float scratchMap = 1.0;
for (int i=0; i<NUM_CLAWS; ++i) {
vec2 uv = getClawUV(coords, 1.0/CLAW_SIZE, SEED*(i+1));
float delay = i/NUM_CLAWS * MAX_SPAWN_TIME;
mask = min(mask, clamp(texture2D(uClawTexture, uv).r + delay, 0, 1));
scratchMap = min(scratchMap, clamp(texture2D(uClawTexture, uv).r + delay, 0, 1));
}
// Get the window texture. We shift the texture lookup by the local derivative of
// the claw texture in order to mimic some folding distortion.
vec2 offset = vec2(dFdx(scratchMap), dFdy(scratchMap)) * uProgress * 0.5;
cogl_color_out = texture2D(uTexture, coords + offset);
// Hide scratched out parts.
cogl_color_out *= (scratchMap > uProgress ? 1 : 0);
// Get the window texture.
vec2 dir = vec2(dFdx(mask), dFdy(mask))*uProgress*mask*0.5;
cogl_color_out = texture2D(uTexture, coords + dir);
float flash = 1.0 / FLASH_INTENSITY * (mask - uProgress) + 1;
if (flash < 0 || flash >= 1) {
flash = 0;
// Add colorful flashes.
float flashIntensity = 1.0 / FLASH_INTENSITY * (scratchMap - uProgress) + 1;
if (flashIntensity < 0 || flashIntensity >= 1) {
flashIntensity = 0;
}
vec3 flashColor = vec3(${color.red / 255},
${color.green / 255},
vec3 flashColor = vec3(${color.red / 255},
${color.green / 255},
${color.blue / 255}) * ${color.alpha / 255};
cogl_color_out *= (mask > uProgress ? 1 : 0);
cogl_color_out.rgb += flash * mix(flashColor, vec3(0), uProgress);
cogl_color_out.rgb += flashIntensity * mix(flashColor, vec3(0), uProgress);
// Fade out the remaining shards.
float fade = smoothstep(0, 1, 1 - clamp((uProgress - 1.0 + FF_TIME)/FF_TIME, 0, 1));
cogl_color_out *= fade;
// cogl_color_out = vec4(vec3(flash), 1);
// cogl_color_out = vec4(vec3(mask), 1);
// These are pretty useful for understanding how this works.
// cogl_color_out = vec4(vec3(flashIntensity), 1);
// cogl_color_out = vec4(vec3(scratchMap), 1);
}
`);
};