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randomised tiling

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This commit is contained in:
minjaesong
2023-11-04 17:21:15 +09:00
parent 6ae39d38e3
commit eaef2f0c6a
4 changed files with 167 additions and 97 deletions
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42
src/shaders/tiling.frag
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@@ -48,9 +48,9 @@ ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tilesInAtlas.x), tileNumber / int(tilesInAtlas.x));
}
// return: int=0xaarrggbb
// return: int=0x(aa)rrggbb
int _colToInt(vec4 color) {
return int(color.b * 255) | (int(color.g * 255) << 8) | (int(color.r * 255) << 16) | (int(color.a * 255) << 24);
return int(color.b * 255) | (int(color.g * 255) << 8) | (int(color.r * 255) << 16);// | (int(color.a * 255) << 24);
}
// 0x00ggbb where int=0xaarrggbb
@@ -65,6 +65,41 @@ int getBreakageFromColor(vec4 color) {
return (_colToInt(color) >> 20) & 0xF;
}
// 0x000r0000 where int=0xaarrggbb
// return: [0..15]
int getTileFlipRotFromColor(vec4 color) {
return (_colToInt(color) >> 16) & 0xF;
}
mat2[] flipRotMat = mat2[](
mat2( 1.0, 0.0, 0.0, 1.0),
mat2(-1.0, 0.0, 0.0, 1.0),
mat2( 0.0, -1.0, 1.0, 0.0),
mat2( 0.0, 1.0, 1.0, 0.0),
mat2(-1.0, 0.0, 0.0, -1.0),
mat2( 1.0, 0.0, 0.0, -1.0),
mat2( 0.0, 1.0, -1.0, 0.0),
mat2( 0.0, -1.0, -1.0, 0.0)
);
vec2[] flipRotOffset = vec2[](
vec2(0, 0),
vec2(1, 0),
vec2(0, 1),
vec2(0, 0),
vec2(1, 1),
vec2(0, 1),
vec2(1, 0),
vec2(1, 1)
);
vec2 uvFlipRot(int op, vec2 uv) {
return flipRotMat[op] * uv + flipRotOffset[op] * tileSizeInPx;
}
void main() {
// READ THE FUCKING MANUAL, YOU DONKEY !! //
@@ -83,13 +118,14 @@ void main() {
vec4 tileFromMap = texture(tilemap, flippedFragCoord / overscannedScreenDimension); // raw tile number
int tile = getTileFromColor(tileFromMap);
int breakage = getBreakageFromColor(tileFromMap);
int flipRot = getTileFlipRotFromColor(tileFromMap);
ivec2 tileXY = getTileXY(tile);
ivec2 breakageXY = getTileXY(breakage + 5); // +5 is hard-coded constant that depends on the contents of the atlas
// 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 uvCoordForTile = uvFlipRot(flipRot, 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;