partially working hq2x, may not work on macOS tho

src/net/torvald/terrarum/App.java

@@ -239,13 +239,11 @@ public class App implements ApplicationListener {
     public static ShaderProgram shaderColLUT;
     public static ShaderProgram shaderReflect;
     public static ShaderProgram shaderGhastlyWhite;
-    public static ShaderProgram shaderHQ2x;
-
-    private static Texture hq2xLut;
+    public static Hq2x hq2x;
 
     public static Mesh fullscreenQuad;
     public static Mesh fullscreenQuad2x;
-    public static Mesh fullscreenQuad2d;
+    public static Mesh fullscreenQuadHQnX;
     private static OrthographicCamera camera;
     private static FlippingSpriteBatch logoBatch;
     public static TextureRegion logo;
@@ -478,9 +476,7 @@ public class App implements ApplicationListener {
         );
         shaderPassthruRGBA = loadShaderFromClasspath("shaders/gl32spritebatch.vert", "shaders/gl32spritebatch.frag");
         shaderReflect = loadShaderFromClasspath("shaders/default.vert", "shaders/reflect.frag");
-        shaderHQ2x = loadShaderFromClasspath("shaders/hq2x.vert", "shaders/hq2x.frag");
-
-        hq2xLut = new Texture(Gdx.files.classpath("shaders/hq2x.tga"));
+        hq2x = new Hq2x(2);
 
         fullscreenQuad = new Mesh(
                 true, 4, 6,
@@ -494,7 +490,7 @@ public class App implements ApplicationListener {
                 VertexAttribute.ColorUnpacked(),
                 VertexAttribute.TexCoords(0)
         );
-        fullscreenQuad2d = new Mesh(
+        fullscreenQuadHQnX = new Mesh(
                 true, 4, 6,
                 VertexAttribute.Position(),
                 VertexAttribute.ColorUnpacked(),
@@ -502,7 +498,7 @@ public class App implements ApplicationListener {
         );
         updateFullscreenQuad(fullscreenQuad, scr.getWidth(), scr.getHeight());
         updateFullscreenQuad(fullscreenQuad2x, scr.getWidth() * 2, scr.getHeight() * 2);
-        updateFullscreenQuad(fullscreenQuad2d, scr.getWidth() / 2, scr.getHeight() / 2);
+        updateFullscreenQuad(fullscreenQuadHQnX, Math.round(scr.getWf() * 1280f / 2028f), Math.round(scr.getHf() * 720f / 982f));
 
         // set up renderer info variables
         renderer = Gdx.graphics.getGLVersion().getRendererString();
@@ -594,55 +590,18 @@ public class App implements ApplicationListener {
         }*/
 
 
-        if (getConfigString("screenmagnifyingfilter").equals("hq2x")) {
-            int canvasWidth = postProcessorOutFBO.getWidth(); // not zoomed dimension
-            int canvasHeight = postProcessorOutFBO.getHeight();
-
+        if (getConfigString("screenmagnifyingfilter").equals("hq2x") ) {
             FrameBufferManager.begin(postProcessorOutFBO2);
-
-            shaderHQ2x.bind();
-            shaderHQ2x.setUniformMatrix("u_projTrans", camera.combined);
-            shaderHQ2x.setUniformi("u_lut", 1);
-            shaderHQ2x.setUniformi("u_texture", 0);
-            shaderHQ2x.setUniformf("u_textureSize", canvasWidth, canvasHeight);
-            hq2xLut.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);
-            hq2xLut.setWrap(Texture.TextureWrap.Repeat, Texture.TextureWrap.Repeat);
-            hq2xLut.bind(1);
-            postProcessorOutFBO.getColorBufferTexture().setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);
-            postProcessorOutFBO.getColorBufferTexture().setWrap(Texture.TextureWrap.Repeat, Texture.TextureWrap.Repeat);
-            postProcessorOutFBO.getColorBufferTexture().bind(0);
-            fullscreenQuad.render(shaderHQ2x, GL20.GL_TRIANGLES); // the shader expects the target texture size to be 2x the input dimension
-
+            hq2x.renderToScreen(postProcessorOutFBO.getColorBufferTexture());
             FrameBufferManager.end();
 
 
 
-            if (screenshotRequested) {
-                FrameBufferManager.begin(postProcessorOutFBO2);
-                try {
-                    Pixmap p = Pixmap.createFromFrameBuffer(0, 0, postProcessorOutFBO2.getWidth(), postProcessorOutFBO2.getHeight());
-                    PixmapIO.writePNG(Gdx.files.absolute(defaultDir+"/Screenshot-"+String.valueOf(System.currentTimeMillis())+".png"), p, 9, true);
-                    p.dispose();
-                    Terrarum.INSTANCE.getIngame().sendNotification("Screenshot taken");
-                }
-                catch (Throwable e) {
-                    e.printStackTrace();
-                    Terrarum.INSTANCE.getIngame().sendNotification("Failed to take screenshot: "+e.getMessage());
-                }
-                FrameBufferManager.end();
-                screenshotRequested = false;
-            }
-
-
-
-
             shaderPassthruRGBA.bind();
-            shaderPassthruRGBA.setUniformMatrix("u_projTrans", camera.combined);
             shaderPassthruRGBA.setUniformi("u_texture", 0);
             postProcessorOutFBO2.getColorBufferTexture().setFilter(Texture.TextureFilter.Linear, Texture.TextureFilter.Linear);
-            postProcessorOutFBO2.getColorBufferTexture().setWrap(Texture.TextureWrap.Repeat, Texture.TextureWrap.Repeat);
             postProcessorOutFBO2.getColorBufferTexture().bind(0);
-            fullscreenQuad.render(shaderPassthruRGBA, GL20.GL_TRIANGLES);
+            fullscreenQuadHQnX.render(shaderPassthruRGBA, GL20.GL_TRIANGLES);
         }
         else if (getConfigDouble("screenmagnifying") < 1.01 || getConfigString("screenmagnifyingfilter").equals("none")) {
             shaderPassthruRGBA.bind();
@@ -796,7 +755,7 @@ public class App implements ApplicationListener {
         TerrarumPostProcessor.INSTANCE.resize(scr.getWidth(), scr.getHeight());
         updateFullscreenQuad(fullscreenQuad, scr.getWidth(), scr.getHeight());
         updateFullscreenQuad(fullscreenQuad2x, scr.getWidth() * 2, scr.getHeight() * 2);
-        updateFullscreenQuad(fullscreenQuad2d, scr.getWidth() / 2, scr.getHeight() / 2);
+        updateFullscreenQuad(fullscreenQuadHQnX, Math.round(scr.getWf() * 1280f / 2028f), Math.round(scr.getHf() * 720f / 982f));
 
 
         if (renderFBO == null ||
@@ -865,14 +824,12 @@ public class App implements ApplicationListener {
         shaderColLUT.dispose();
         shaderReflect.dispose();
         shaderGhastlyWhite.dispose();
-        shaderHQ2x.dispose();
-
-        hq2xLut.dispose();
+        hq2x.dispose();
 
         CommonResourcePool.INSTANCE.dispose();
         fullscreenQuad.dispose();
         fullscreenQuad2x.dispose();
-        fullscreenQuad2d.dispose();
+        fullscreenQuadHQnX.dispose();
         logoBatch.dispose();
         batch.dispose();
 //        shapeRender.dispose();

src/net/torvald/terrarum/Hq2x.kt

@@ -0,0 +1,214 @@
+package net.torvald.terrarum
+
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.files.FileHandle
+import com.badlogic.gdx.graphics.*
+import com.badlogic.gdx.graphics.VertexAttributes.Usage
+import com.badlogic.gdx.graphics.glutils.FrameBuffer
+import com.badlogic.gdx.graphics.glutils.ShaderProgram
+import com.badlogic.gdx.math.Matrix4
+import com.badlogic.gdx.utils.Disposable
+import com.badlogic.gdx.utils.GdxRuntimeException
+
+/**
+ * [HQnX](https://en.wikipedia.org/wiki/Pixel-art_scaling_algorithms#hqnx_family)
+ * upscale algorithm GLSL implementation based on
+ * [CrossVR](https://github.com/CrossVR/hqx-shader/tree/master/glsl) project.
+ */
+class Hq2x : Disposable {
+
+    companion object {
+        private const val TEXTURE_HANDLE0 = 0
+        private const val TEXTURE_HANDLE1 = 1
+
+        private const val U_TEXTURE = "u_texture"
+        private const val U_LUT = "u_lut"
+        private const val U_TEXTURE_SIZE = "u_textureSize"
+    }
+
+    private val mesh = ViewportQuadMesh(
+        VertexAttribute(Usage.Position, 2, "a_position"),
+        VertexAttribute(Usage.TextureCoordinates, 2, "a_texCoord0"))
+
+    private val program: ShaderProgram
+    private val lutTexture: Texture
+    private val scaleFactor: Int
+
+    private var dstBuffer: FrameBuffer? = null
+    private var dstWidth = 0
+    private var dstHeight = 0
+
+    /** @param scaleFactor should be 2, 3 or 4 value. */
+    constructor(scaleFactor: Int) {
+        if (scaleFactor !in 2..4) {
+            throw GdxRuntimeException("Scale factor should be 2, 3 or 4.")
+        }
+
+        program = compileShader(
+            Gdx.files.classpath("shaders/hq2x.vert"),
+            Gdx.files.classpath("shaders/hq2x.frag"),
+            "#define SCALE ${scaleFactor}.0")
+
+        lutTexture = Texture(Gdx.files.classpath("shaders/hq${scaleFactor}x.png"))
+
+        this.scaleFactor = scaleFactor
+    }
+
+    override fun dispose() {
+        mesh.dispose()
+        program.dispose()
+        lutTexture.dispose()
+        dstBuffer?.dispose()
+    }
+
+    fun rebind() {
+        program.bind()
+        program.setUniformi(U_TEXTURE, TEXTURE_HANDLE0)
+        program.setUniformi(U_LUT, TEXTURE_HANDLE1)
+        program.setUniformf(U_TEXTURE_SIZE,
+            dstWidth / scaleFactor.toFloat(),
+            dstHeight / scaleFactor.toFloat())
+    }
+
+    fun renderToScreen(src: Texture) {
+        validate(src)
+
+        lutTexture.bind(TEXTURE_HANDLE1)
+        src.bind(TEXTURE_HANDLE0)
+        src.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest)
+
+        program.bind()
+        mesh.render(program)
+    }
+
+    fun renderToBuffer(src: Texture): Texture {
+        validate(src)
+        validateDstBuffer()
+
+        lutTexture.bind(TEXTURE_HANDLE1)
+        src.bind(TEXTURE_HANDLE0)
+        src.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest)
+
+        dstBuffer!!.begin()
+        program.bind()
+        mesh.render(program)
+        dstBuffer!!.end()
+
+        return dstBuffer!!.colorBufferTexture
+    }
+
+    private fun validate(src: Texture) {
+        val targetWidth = src.width * scaleFactor
+        val targetHeight = src.height * scaleFactor
+
+//        println("[Hq2x] $targetWidth x $targetHeight")
+
+        if (dstWidth != targetWidth || dstHeight != targetHeight) {
+            dstWidth = targetWidth
+            dstHeight = targetHeight
+            rebind()
+        }
+    }
+
+    private fun validateDstBuffer() {
+        if (dstBuffer == null || dstBuffer!!.width != dstWidth || dstBuffer!!.height != dstHeight) {
+            dstBuffer?.dispose()
+            dstBuffer = FrameBuffer(Pixmap.Format.RGB888, dstWidth, dstHeight, false)
+            dstBuffer!!.colorBufferTexture.setFilter(
+                Texture.TextureFilter.Nearest,
+                Texture.TextureFilter.Nearest)
+        }
+    }
+}
+
+/**
+ * Encapsulates a fullscreen quad mesh. Geometry is aligned to the viewport corners.
+ *
+ * @author bmanuel
+ * @author metaphore
+ */
+private class ViewportQuadMesh : Disposable {
+
+    companion object {
+        private const val VERT_SIZE = 16
+        private const val X1 = 0
+        private const val Y1 = 1
+        private const val U1 = 2
+        private const val V1 = 3
+        private const val X2 = 4
+        private const val Y2 = 5
+        private const val U2 = 6
+        private const val V2 = 7
+        private const val X3 = 8
+        private const val Y3 = 9
+        private const val U3 = 10
+        private const val V3 = 11
+        private const val X4 = 12
+        private const val Y4 = 13
+        private const val U4 = 14
+        private const val V4 = 15
+
+        private val verts: FloatArray
+
+        init {
+            verts = FloatArray(VERT_SIZE)
+
+            // Vertex coords
+            verts[X1] = -1f
+            verts[Y1] = -1f
+            verts[X2] = 1f
+            verts[Y2] = -1f
+            verts[X3] = 1f
+            verts[Y3] = 1f
+            verts[X4] = -1f
+            verts[Y4] = 1f
+
+            // Tex coords
+            verts[U1] = 0f
+            verts[V1] = 0f
+            verts[U2] = 1f
+            verts[V2] = 0f
+            verts[U3] = 1f
+            verts[V3] = 1f
+            verts[U4] = 0f
+            verts[V4] = 1f
+        }
+    }
+
+    private val mesh: Mesh
+
+    constructor(vararg attributes: VertexAttribute) {
+        mesh = Mesh(true, 4, 0, *attributes)
+        mesh.setVertices(verts)
+    }
+
+    override fun dispose() {
+        mesh.dispose()
+    }
+
+    /** Renders the quad with the specified shader program. */
+    fun render(program: ShaderProgram) {
+        mesh.render(program, GL20.GL_TRIANGLE_FAN, 0, 4)
+    }
+}
+
+private fun compileShader(vertexFile: FileHandle, fragmentFile: FileHandle, defines: String): ShaderProgram {
+    val sb = StringBuilder()
+    sb.append("Compiling \"").append(vertexFile.name()).append('/').append(fragmentFile.name()).append('\"')
+    if (defines.isNotEmpty()) {
+        sb.append(" w/ (").append(defines.replace("\n", ", ")).append(")")
+    }
+    sb.append("...")
+    Gdx.app.log("HqnxEffect", sb.toString())
+
+    val srcVert = vertexFile.readString()
+    val srcFrag = fragmentFile.readString()
+    val shader = ShaderProgram(
+        "$defines\n$srcVert".trimIndent(),
+        "$defines\n$srcFrag".trimIndent())
+
+    if (!shader.isCompiled) {
+        throw GdxRuntimeException("Shader compilation error: ${vertexFile.name()}/${fragmentFile.name()}\n${shader.log}")
+    }
+    return shader
+}

src/shaders/hq2x.frag

@@ -1,24 +1,24 @@
 // This float value should be defined from the compiling code.
 // #define SCALE [2, 3, 4].0
 
-#version 150
 #ifdef GL_ES
-    precision mediump float;
+#define PRECISION mediump
+precision PRECISION float;
+precision PRECISION int;
+#else
+#define PRECISION
 #endif
-#define SCALE 2.0
 
 uniform sampler2D u_texture;
 uniform sampler2D u_lut;
 uniform vec2 u_textureSize;
 
-in vec4 v_texCoord[4];
+varying vec4 v_texCoord[4];
 
 const mat3 YUV_MATRIX = mat3(0.299, 0.587, 0.114, -0.169, -0.331, 0.5, 0.5, -0.419, -0.081);
 const vec3 YUV_THRESHOLD = vec3(48.0/255.0, 7.0/255.0, 6.0/255.0);
 const vec3 YUV_OFFSET = vec3(0, 0.5, 0.5);
 
-out vec4 fragColor;
-
 bool diff(vec3 yuv1, vec3 yuv2) {
     return any(greaterThan(abs((yuv1 + YUV_OFFSET) - (yuv2 + YUV_OFFSET)), YUV_THRESHOLD));
 }
@@ -41,24 +41,24 @@ void main() {
 
     float dx = v_texCoord[0].z;
     float dy = v_texCoord[0].w;
-    vec3 p1  = texture(u_texture, v_texCoord[0].xy).rgb;
-    vec3 p2  = texture(u_texture, v_texCoord[0].xy + vec2(dx, dy) * quad).rgb;
-    vec3 p3  = texture(u_texture, v_texCoord[0].xy + vec2(dx, 0) * quad).rgb;
-    vec3 p4  = texture(u_texture, v_texCoord[0].xy + vec2(0, dy) * quad).rgb;
+    vec3 p1  = texture2D(u_texture, v_texCoord[0].xy).rgb;
+    vec3 p2  = texture2D(u_texture, v_texCoord[0].xy + vec2(dx, dy) * quad).rgb;
+    vec3 p3  = texture2D(u_texture, v_texCoord[0].xy + vec2(dx, 0) * quad).rgb;
+    vec3 p4  = texture2D(u_texture, v_texCoord[0].xy + vec2(0, dy) * quad).rgb;
     // Use mat4 instead of mat4x3 here to support GLES.
     mat4 pixels = mat4(vec4(p1, 0.0), vec4(p2, 0.0), vec4(p3, 0.0), vec4(p4, 0.0));
 
-    vec3 w1  = yuv * texture(u_texture, v_texCoord[1].xw).rgb;
-    vec3 w2  = yuv * texture(u_texture, v_texCoord[1].yw).rgb;
-    vec3 w3  = yuv * texture(u_texture, v_texCoord[1].zw).rgb;
+    vec3 w1  = yuv * texture2D(u_texture, v_texCoord[1].xw).rgb;
+    vec3 w2  = yuv * texture2D(u_texture, v_texCoord[1].yw).rgb;
+    vec3 w3  = yuv * texture2D(u_texture, v_texCoord[1].zw).rgb;
 
-    vec3 w4  = yuv * texture(u_texture, v_texCoord[2].xw).rgb;
+    vec3 w4  = yuv * texture2D(u_texture, v_texCoord[2].xw).rgb;
     vec3 w5  = yuv * p1;
-    vec3 w6  = yuv * texture(u_texture, v_texCoord[2].zw).rgb;
+    vec3 w6  = yuv * texture2D(u_texture, v_texCoord[2].zw).rgb;
 
-    vec3 w7  = yuv * texture(u_texture, v_texCoord[3].xw).rgb;
-    vec3 w8  = yuv * texture(u_texture, v_texCoord[3].yw).rgb;
-    vec3 w9  = yuv * texture(u_texture, v_texCoord[3].zw).rgb;
+    vec3 w7  = yuv * texture2D(u_texture, v_texCoord[3].xw).rgb;
+    vec3 w8  = yuv * texture2D(u_texture, v_texCoord[3].yw).rgb;
+    vec3 w9  = yuv * texture2D(u_texture, v_texCoord[3].zw).rgb;
 
     bvec3 pattern[3];
     pattern[0] =  bvec3(diff(w5, w1), diff(w5, w2), diff(w5, w3));
@@ -75,13 +75,9 @@ void main() {
 
     vec2 step = vec2(1.0) / vec2(256.0, 16.0 * (SCALE * SCALE));
     vec2 offset = step / vec2(2.0);
-    vec4 weights = texture(u_lut, index * step + offset);
+    vec4 weights = texture2D(u_lut, index * step + offset);
     float sum = dot(weights, vec4(1));
     vec3 res = (pixels * (weights / sum)).rgb;
 
-    fragColor = vec4(res.rgb, 1.0);
-
-
-
-//    fragColor = vec4(v_texCoord[0].x, v_texCoord[0].y, 0.0, 1.0);
+    gl_FragColor.rgb = res;
 }

src/shaders/hq2x.vert

@@ -1,26 +1,25 @@
-#version 150
 #ifdef GL_ES
-    precision mediump float;
+#define PRECISION mediump
+precision PRECISION float;
+precision PRECISION int;
+#else
+#define PRECISION
 #endif
-#define SCALE 1.0
 
-in vec4 a_position;
-in vec2 a_texCoord0;
+attribute vec4 a_position;
+attribute vec2 a_texCoord0;
 
-uniform mat4 u_projTrans;
+uniform vec2 u_textureSize;
 
-out vec2 u_textureSize;
-out vec4 v_texCoord[4];
+varying vec4 v_texCoord[4];
 
 void main() {
-    gl_Position = u_projTrans * a_position / SCALE;
+    gl_Position = a_position;
 
     vec2 ps = 1.0/u_textureSize;
     float dx = ps.x;
     float dy = ps.y;
 
-    vec2 a_texCoord00 = a_texCoord0 / SCALE;
-
     //   +----+----+----+
     //   |    |    |    |
     //   | w1 | w2 | w3 |
@@ -33,8 +32,8 @@ void main() {
     //   +----+----+----+
 
     v_texCoord[0].zw = ps;
-    v_texCoord[0].xy = a_texCoord00.xy;
-    v_texCoord[1] = a_texCoord00.xxxy + vec4(-dx, 0, dx, -dy); //  w1 | w2 | w3
-    v_texCoord[2] = a_texCoord00.xxxy + vec4(-dx, 0, dx,   0); //  w4 | w5 | w6
-    v_texCoord[3] = a_texCoord00.xxxy + vec4(-dx, 0, dx,  dy); //  w7 | w8 | w9
+    v_texCoord[0].xy = a_texCoord0.xy;
+    v_texCoord[1] = a_texCoord0.xxxy + vec4(-dx, 0, dx, -dy); //  w1 | w2 | w3
+    v_texCoord[2] = a_texCoord0.xxxy + vec4(-dx, 0, dx,   0); //  w4 | w5 | w6
+    v_texCoord[3] = a_texCoord0.xxxy + vec4(-dx, 0, dx,  dy); //  w7 | w8 | w9
 }