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#version 430
precision highp float;
in vec3 vertexPos;
in vec2 fragTexCoord;
in vec4 fragColor;
uniform sampler2D texture0;
uniform sampler2D atlasTexture;
uniform sampler2D tilemapTexture;
uniform vec2 offset;
uniform float zoom;
uniform ivec2 atlasSize;
uniform ivec2 renderArea;
out vec4 finalColor;
const vec4 none = vec4(0.0f, 0.0f, 0.0f, 0.0f);
const vec4 gridColor = vec4(0.0f, 0.0f, 0.0f, 0.0f);
bool outBounds(vec2 coords, vec2 area) {
return coords.x > area.x
|| coords.x < 0
|| coords.y > area.y
|| coords.y < 0;
}
ivec2 calcTileOffset(int tileIndex) {
tileIndex -= 1;
int x = tileIndex % atlasSize.x;
int y = (tileIndex - x) / atlasSize.y;
return ivec2(x, y);
}
vec4 drawGrid(vec2 coords) {
if (abs(floor(coords.x) - coords.x) < 1/16.0f
|| abs(floor(coords.y) - coords.y) < 1/16.0f) {
return gridColor;
} else {
return none;
}
}
vec4 tile(vec2 coords, int tileIndex) {
if (
tileIndex == 0
|| outBounds(coords, vec2(1, 1))) {
return drawGrid(coords);
} else {
ivec2 tileOffset = calcTileOffset(tileIndex);
vec2 texCoords = coords + (tileOffset);
texCoords /= atlasSize;
return texture(atlasTexture, texCoords);
}
}
void main() {
ivec2 res = textureSize(texture0, 1);
vec2 uv = fragTexCoord;
uv /= zoom;
uv -= offset;
// get position in tiled world wow
ivec2 tilemapPos = ivec2(floor(uv));
if (outBounds(uv, renderArea)) {
finalColor = none;
} else {
vec2 position = mod(uv, 1);
int tileIndex = int(256*texelFetch(tilemapTexture, tilemapPos, 0).r);
finalColor = tile(position, tileIndex);
}
}
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