curioustorvald/Terrarum
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now I can't even tell if it's working as intended or not

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minjaesong
2017-08-30 22:16:10 +09:00
parent d8fe375c0c
commit 959019f9b3
6 changed files with 169 additions and 76 deletions
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15
assets/tiling.frag
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@@ -24,11 +24,15 @@ uniform sampler2D backgroundTexture;
uniform ivec2 tilesInAtlas = ivec2(256, 256);
uniform ivec2 atlasTexSize = ivec2(4096, 4096);
uniform vec4 colourFilter = vec4(1, 1, 1, 1);
uniform vec2 cameraTranslation = vec2(0, 0); // Y-flipped
uniform ivec2 cameraTranslation = ivec2(0, 0);
uniform int tileSizeInPx = 16;
vec4 nocolour = vec4(0,0,0,0);
ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tilesInAtlas.x), tileNumber / int(tilesInAtlas.x));
}
@@ -47,7 +51,7 @@ void main() {
// default gl_FragCoord takes half-integer (represeting centre of the pixel) -- could be useful for phys solver?
// This one, however, takes exact integer by rounding down. //
vec2 overscannedScreenDimension = tilesInAxes * tileSizeInPx; // one used by the tileFromMap
vec2 flippedFragCoord = vec2(gl_FragCoord.x, screenDimension.y - gl_FragCoord.y); // NO IVEC2!!; this flips Y
vec2 flippedFragCoord = vec2(gl_FragCoord.x, screenDimension.y - gl_FragCoord.y) + cameraTranslation; // NO IVEC2!!; this flips Y
vec2 pxCoord = flippedFragCoord.xy;
@@ -63,10 +67,13 @@ void main() {
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 + cameraTranslation / tileSizeInPx) * singleTileSizeInUV; // where the tile starts in the atlas, using uv coord (0..1)
highp vec2 uvCoordOffset = tileXY * singleTileSizeInUV; // where the tile starts in the atlas, using uv coord (0..1)
highp vec2 finalUVCoordForTile = uvCoordForTile + uvCoordOffset;// where we should be actually looking for in atlas, using UV coord (0..1)
gl_FragColor = v_color * texture2D(tilesAtlas, finalUVCoordForTile);
if (tileXY.x == 0 && tileXY.y == 0)
gl_FragColor = nocolour;
else
gl_FragColor = colourFilter * texture2D(tilesAtlas, finalUVCoordForTile);
}