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tiling using shader, sorta works

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minjaesong
2017-08-26 23:48:07 +09:00
parent e7c4a7b1e8
commit 3ffbb8bef6
6 changed files with 114 additions and 59 deletions
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63
assets/tiling.frag
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@@ -2,12 +2,19 @@
#ifdef GL_ES
precision mediump float;
#endif
#extension GL_EXT_gpu_shader4 : enable
layout(origin_upper_left) in vec4 gl_FragCoord;
//layout(origin_upper_left) in vec4 gl_FragCoord; // commented; requires #version 150 or later
// gl_FragCoord is origin to bottom-left
varying vec4 v_color;
varying vec2 v_texCoords;
uniform sampler2D u_texture;
uniform vec2 tilemapSize;
uniform sampler2D tilemap; // MUST be RGBA8888
uniform sampler2D tilesAtlas;
uniform sampler2D backgroundTexture;
@@ -17,30 +24,52 @@ uniform vec2 atlasTexSize = vec2(4096, 4096);
uniform vec2 tileInDim; // vec2(tiles_in_horizontal, tiles_in_vertical)
uniform vec2 cameraTranslation = vec2(0, 0);
uniform vec2 cameraTranslation = vec2(0, 0); // Y-flipped
uniform float tileSizeInPx = 16;
uniform float tilemap[tileInDim.x * tileInDim.y]; // must be float array
ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tileInAtlas.x), tileNumber / int(tileInAtlas.x));
}
void main() {
vec2 pxCoord = gl_FragCoord.xy - cameraTranslation;
vec2 pxCoordModTilesize = mod(pxCoord, tileSizeInPx);
vec2 tileCoord = floor(pxCoord / tileCoord);
int absoluteTileCoord = int(tileCoord.x + tileCoord.y * tileInDim.x);
// READ THE FUCKING MANUAL, YOU DONKEY !! //
// Without further code in either GDX or this shader, //
// Onscreen TILE COORD WILL BE UPSIDE DOWN (bottom first). //
// This is intended behaviour. //
float tile = tilemap[absoluteTileCoord]; // sure it's integer at this point
vec2 fragCoordInAtlas = vec2(
tileSizeInPx * mod(tile, tileInAtlas.x) + pxCoordModTilesize.x,
tileSizeInPx * floor(tile / tileInAtlas.x) + pxCoordModTilesize.y
);
vec2 fragCoordUV = vec2(fragCoordInAtlas.x / atlasTexSize.x, 1 - fragCoordInAtlas.y / atlasTexSize.y);
vec4 fragInAtlas = texture2D(tilesAtlas, fragCoordUV);
vec2 pxCoord = gl_FragCoord.xy + cameraTranslation;
int tile = 0;// uses usual absolute tile ID for atlas (upper-left); sample from texture2D(tileAtlas, some more code);
ivec2 tileXY = getTileXY(tile);
vec2 coordInTile = mod(pxCoord, tileSizeInPx) / tileSizeInPx; // 0..1 regardless of tile position in atlas
// flip Y of coordInTile //
coordInTile = vec2(coordInTile.x, 1 - coordInTile.y);
highp vec2 singleTileSizeInUV = vec2(1) / tileInAtlas; // 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 finalUVCoordForTile = uvCoordForTile + uvCoordOffset;// where we should be actually looking for in atlas, using UV coord (0..1)
gl_FragColor = fragInAtlas;
gl_FragColor = vec4(texture2D(tilesAtlas, finalUVCoordForTile));
//gl_FragColor = fragInAtlas;
//gl_FragColor = vec4((gl_FragCoord.xy / vec2(512, 512)), 0, 1.0);
//vec4 atlascol = texture2D(tilesAtlas, v_texCoords);
//vec4 tilemapcol = texture2D(tilemap, v_texCoords);
//gl_FragColor = atlascol * tilemapcol;
//gl_FragColor = vec4(v_texCoords.x, v_texCoords.y, 0, 1.0);
}