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drawing of the tile breakage

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minjaesong
2018-11-10 21:09:02 +09:00
parent c6e9a46c3e
commit f721ad0db9
6 changed files with 58 additions and 28 deletions
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32
assets/tiling.frag
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@@ -34,10 +34,23 @@ ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tilesInAtlas.x), tileNumber / int(tilesInAtlas.x));
}
int getTileFromColor(vec4 color) {
// return: int=0xrrggbb
int _colToInt(vec4 color) {
return int(color.b * 255) | (int(color.g * 255) << 8) | (int(color.r * 255) << 16);
}
// 0x0rggbb where int=0xaarrggbb
// return: [0..1048575]
int getTileFromColor(vec4 color) {
return _colToInt(color) & 0x0FFFFF;
}
// 0xr00000 where int=0xaarrggbb
// return: [0..15]
int getBreakageFromColor(vec4 color) {
return (_colToInt(color) >> 20) & 0xF;
}
void main() {
// READ THE FUCKING MANUAL, YOU DONKEY !! //
@@ -54,28 +67,31 @@ void main() {
mediump vec4 tileFromMap = texture2D(tilemap, flippedFragCoord / overscannedScreenDimension); // <- THE CULPRIT
int tile = getTileFromColor(tileFromMap);
int breakage = getBreakageFromColor(tileFromMap);
ivec2 tileXY = getTileXY(tile);
ivec2 breakageXY = getTileXY(breakage + 5);
vec2 coordInTile = mod(pxCoord, tileSizeInPx) / tileSizeInPx; // 0..1 regardless of tile position in atlas
highp vec2 singleTileSizeInUV = vec2(1) / tilesInAtlas; // constant 0.00390625
highp vec2 uvCoordForTile = coordInTile * singleTileSizeInUV; // 0..0.00390625 regardless of tile position in atlas
highp vec2 uvCoordOffset = tileXY * singleTileSizeInUV; // where the tile starts in the atlas, using uv coord (0..1)
highp vec2 uvCoordOffsetBreakage = breakageXY * singleTileSizeInUV;
highp vec2 finalUVCoordForTile = uvCoordForTile + uvCoordOffset;// where we should be actually looking for in atlas, using UV coord (0..1)
highp vec2 finalUVCoordForBreakage = uvCoordForTile + uvCoordOffsetBreakage;
// TODO blend a breakage (0xrrggbb where 0xr0 -- upper 4 bits of int_red component)
// TODO finally "blend" a breakage (0xrrggbb where 0xr00000 -- upper 4 bits of int_red component)
mediump vec4 finalTile = texture2D(tilesAtlas, finalUVCoordForTile);
mediump vec4 finalBreakage = texture2D(tilesAtlas, finalUVCoordForBreakage);
gl_FragColor = colourFilter * (mix(finalTile, finalBreakage, finalBreakage.a));
// if statements considered harmful (on shader program)
// --definitely not Dijkstra
/*if (tileXY.x == 0 && tileXY.y == 0)
gl_FragColor = nocolour;
else*/
gl_FragColor = colourFilter * texture2D(tilesAtlas, finalUVCoordForTile);
}