curioustorvald/Terrarum
1
0
Fork 0
mirror of https://github.com/curioustorvald/Terrarum.git synced 2026-03-13 07:06:06 +09:00
Code Issues Packages Projects Releases Wiki Activity

fucking finally... (needs cleanup)

Browse Source
This commit is contained in:
minjaesong
2017-08-27 23:47:30 +09:00
parent 2928aa2eb7
commit ee7d51c21b
2 changed files with 65 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
assets/tiling.frag
View File

@@ -12,20 +12,22 @@ varying vec2 v_texCoords;
uniform sampler2D u_texture;
uniform vec2 screenDimension;
uniform vec2 tilesInAxes;
uniform vec2 tilemapSize;
uniform ivec2 tilemapDimension;
uniform sampler2D tilemap; // MUST be RGBA8888
uniform sampler2D tilesAtlas;
uniform sampler2D backgroundTexture;
uniform vec2 tileInAtlas = vec2(256, 256);
uniform vec2 atlasTexSize = vec2(4096, 4096);
uniform ivec2 tileInAtlas = ivec2(256, 256);
uniform ivec2 atlasTexSize = ivec2(4096, 4096);
uniform vec2 tileInDim; // vec2(tiles_in_horizontal, tiles_in_vertical)
//uniform vec2 tileInDim; // vec2(tiles_in_horizontal, tiles_in_vertical)
uniform vec2 cameraTranslation = vec2(0, 0); // Y-flipped
uniform float tileSizeInPx = 16;
uniform int tileSizeInPx = 16;
@@ -33,23 +35,32 @@ ivec2 getTileXY(int tileNumber) {
return ivec2(tileNumber % int(tileInAtlas.x), tileNumber / int(tileInAtlas.x));
}
int getTileFromColor(vec4 color) {
return int(color.b * 255) + (int(color.g * 255) * 256) + (int(color.r * 255) * 65536);
}
void main() {
// 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. //
// This code purposedly uses flipped fragcoord. //
// Make sure you don't use gl_FragCoord unknowingly! //
vec2 pxCoord = gl_FragCoord.xy + cameraTranslation;
// 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;
vec2 flippedFragCoord = vec2(v_texCoords.x * screenDimension.x, (1 - v_texCoords.y) * screenDimension.y); // NO IVEC2!!
vec2 pxCoord = flippedFragCoord.xy + cameraTranslation;
mediump vec4 tileFromMap = texture2D(tilemap, flippedFragCoord / overscannedScreenDimension); // <- THE CULPRIT
int tile = getTileFromColor(tileFromMap);
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);
vec2 coordInTile = mod(pxCoord, tileSizeInPx) / tileSizeInPx; // 0..1 regardless of tile position in atlas
highp vec2 singleTileSizeInUV = vec2(1) / tileInAtlas; // 0.00390625
highp vec2 uvCoordForTile = coordInTile * singleTileSizeInUV; // 0..0.00390625 regardless of tile position in atlas
@@ -59,8 +70,9 @@ void main() {
highp vec2 finalUVCoordForTile = uvCoordForTile + uvCoordOffset;// where we should be actually looking for in atlas, using UV coord (0..1)
gl_FragColor = vec4(texture2D(tilesAtlas, finalUVCoordForTile));
gl_FragColor = texture2D(tilesAtlas, finalUVCoordForTile);
//gl_FragColor = texture2D(tilemap, v_texCoords); // tilemap seems normal...
//gl_FragColor = tileFromMap; // <- oh, THIS WAS THE CULPRIT!