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according to the opengl wiki this should be more optimised

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minjaesong
2021-08-15 22:25:27 +09:00
parent b2805ba09f
commit 16376b229a
1 changed files with 11 additions and 6 deletions
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17
assets/tiling.frag
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@@ -4,7 +4,7 @@
#version 120
#ifdef GL_ES
precision mediump float;
precision mediump float;
#endif
#extension GL_EXT_gpu_shader4 : enable
@@ -27,7 +27,10 @@ uniform float tilesBlend = 0.0; // percentage of blending [0f..1f]. 0: draws til
uniform vec2 tilesInAtlas = vec2(256.0, 256.0);
uniform vec2 atlasTexSize = vec2(4096.0, 4096.0);
vec2 tileSizeInPx = atlasTexSize / tilesInAtlas; // should be like ivec2(16.0, 16.0)
vec2 _tilesInAtlas = vec2(1.0, 1.0) / tilesInAtlas;
vec2 tileSizeInPx = atlasTexSize * _tilesInAtlas; // should be like ivec2(16.0, 16.0)
vec2 _tileSizeInPx = vec2(1.0, 1.0) / tileSizeInPx; // should be like ivec2(0.06125, 0.06125)
uniform vec4 colourFilter = vec4(1, 1, 1, 1); // used by WALL to darken it
@@ -37,6 +40,8 @@ uniform float drawBreakage = 1.0; // set it to 0f to not draw breakage, 1f to dr
uniform float mulBlendIntensity = 1.0; // used my MUL-blending drawings; works about the same way as the Layer Opacity slider of Photoshop/Krita/etc.
const vec2 bc = vec2(1.0, 0.0); //binary constant
ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tilesInAtlas.x), tileNumber / int(tilesInAtlas.x));
}
@@ -82,9 +87,9 @@ void main() {
// calculate the UV coord value for texture sampling //
// don't really need highp here; read the GLES spec
vec2 uvCoordForTile = (mod(flippedFragCoord, tileSizeInPx) / tileSizeInPx) / tilesInAtlas; // 0..0.00390625 regardless of tile position in atlas
vec2 uvCoordOffsetTile = tileXY / tilesInAtlas; // where the tile starts in the atlas, using uv coord (0..1)
vec2 uvCoordOffsetBreakage = breakageXY / tilesInAtlas;
vec2 uvCoordForTile = (mod(flippedFragCoord, tileSizeInPx) * _tileSizeInPx) * _tilesInAtlas; // 0..0.00390625 regardless of tile position in atlas
vec2 uvCoordOffsetTile = tileXY * _tilesInAtlas; // where the tile starts in the atlas, using uv coord (0..1)
vec2 uvCoordOffsetBreakage = breakageXY * _tilesInAtlas;
// get final UV coord for the actual sampling //
@@ -100,7 +105,7 @@ void main() {
vec4 finalBreakage = drawBreakage * texture2D(tilesAtlas, finalUVCoordForBreakage); // drawBreakeage = 0 to not draw, = 1 to draw
vec4 finalColor = vec4(mix(finalTile.rgb, finalBreakage.rgb, finalBreakage.a), finalTile.a);
vec4 finalColor =mix(finalTile, finalBreakage, finalBreakage.a) * bc.xxxy + (finalTile * bc.yyyx);
gl_FragColor = mix(colourFilter, colourFilter * finalColor, mulBlendIntensity);