camera moving works

assets/tiling.frag

@@ -13,7 +13,7 @@ uniform sampler2D u_texture;
 
 
 uniform vec2 screenDimension;
-uniform vec2 tilesInAxes;
+uniform vec2 tilesInAxes; // vec2(tiles_in_horizontal, tiles_in_vertical)
 
 uniform ivec2 tilemapDimension;
 uniform sampler2D tilemap; // MUST be RGBA8888
@@ -25,7 +25,6 @@ uniform ivec2 tileInAtlas = ivec2(256, 256);
 uniform ivec2 atlasTexSize = ivec2(4096, 4096);
 
 
-//uniform vec2 tileInDim; // vec2(tiles_in_horizontal, tiles_in_vertical)
 uniform vec2 cameraTranslation = vec2(0, 0); // Y-flipped
 uniform int tileSizeInPx = 16;
 
@@ -46,15 +45,12 @@ void main() {
     // Make sure you don't use gl_FragCoord unknowingly! //
 
 
-    // FIXME: cameraTranslation not working as it should
-
-
     // 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 pxCoord = flippedFragCoord.xy + cameraTranslation;
+    vec2 pxCoord = flippedFragCoord.xy;
 
     mediump vec4 tileFromMap = texture2D(tilemap, flippedFragCoord / overscannedScreenDimension); // <- THE CULPRIT
     int tile = getTileFromColor(tileFromMap);
@@ -65,10 +61,10 @@ void main() {
 
     vec2 coordInTile = mod(pxCoord, tileSizeInPx) / tileSizeInPx; // 0..1 regardless of tile position in atlas
 
-    highp vec2 singleTileSizeInUV = vec2(1) / tileInAtlas; // 0.00390625
+    highp vec2 singleTileSizeInUV = vec2(1) / tileInAtlas; // 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 uvCoordOffset = (tileXY + cameraTranslation / tileSizeInPx) * 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)
 

src/net/torvald/terrarum/GlslTilingTest.kt

@@ -108,6 +108,9 @@ object GlslTilingTest : ApplicationAdapter() {
     }
 
 
+    var cameraX = 0f
+    var cameraY = 0f
+
     override fun render() {
         Gdx.graphics.setTitle("GlslTilingTest — F: ${Gdx.graphics.framesPerSecond}")
 
@@ -149,11 +152,14 @@ object GlslTilingTest : ApplicationAdapter() {
         shader.setUniformi("tilemap", 2)
         shader.setUniformi("tilemapDimension", tilesBuffer.width, tilesBuffer.height)
         shader.setUniformf("tilesInAxes", tilesInHorizontal, tilesInVertical)
-        shader.setUniformf("cameraTranslation", 0f, 0f)
+        shader.setUniformf("cameraTranslation", cameraX, cameraY)
         tilesQuad.render(shader, GL20.GL_TRIANGLES)
         shader.end()
         tilesBufferAsTex.dispose()
 
+
+        cameraX += 160 * Gdx.graphics.deltaTime
+        cameraY += 160 * Gdx.graphics.deltaTime
     }
 
     override fun dispose() {