partially working hq2x, may not work on macOS tho

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
 }