wip video device

shaders/frag0.glsl

@@ -1923,4 +1923,17 @@ subroutine(mix_stage_sub) vec4 mix_16(vec2 vUV, sampler2D ta, sampler2D tb, int
 
 // TODO temp
 
-const mat4x4 yuv_to_rgb = {{1,0,1.13983,0},{1,-0.39465,-0.5806,0},{1,2.03211,0,0},{0,0,0,1}};
+const mat3x3 yuv_to_rgb = {{1,1,1},{0,-0.39465,2.03211},{1.13983,-0.5806,0}};
+
+vec4 yuyvTex(sampler2D tex, vec2 vUV, int base_width) {
+    float w = base_width - 1;
+    int x = int(vUV.x * w);
+    int xU = x - x % 2;
+    int xV = x - x % 2 + 1;
+    vec3 yuv = vec3(
+        texture(tex, vec2(vUV.x, 1 - vUV.y)).x,
+        texture(tex, vec2(xU / w, 1 - vUV.y)).y - 0.5,
+        texture(tex, vec2(xV / w, 1 - vUV.y)).y - 0.5
+    );
+    return vec4(yuv_to_rgb * yuv, 1.0);
+}

shaders/frag1.glsl

@@ -7,13 +7,5 @@ in vec2 vUV;
 out vec4 fragColor;
 
 void main() {
-    float r, g, b, y, u, v;
-    vec4 src = texture(tex1, vec2(vUV.x, 1 - vUV.y));
-    y = src.r;
-    u = src.g - 0.5;
-    v = src.a - 0.5;
-    r = y + 1.13983 * v;
-    g = y - 0.39465 * u - 0.58060 * v;
-    b = y + 2.03211 * u;
-    fragColor = vec4(r, g, b, 1.0);
+    fragColor = yuyvTex(tex1, vUV, 320);
 }

shaders/frag2.glsl

@@ -7,13 +7,5 @@ in vec2 vUV;
 out vec4 fragColor;
 
 void main() {
-    float r, g, b, y, u, v;
-    vec4 src = texture(tex2, vec2(vUV.x, 1 - vUV.y));
-    y = src.r;
-    u = src.g - 0.5;
-    v = src.a - 0.5;
-    r = y + 1.13983 * v;
-    g = y - 0.39465 * u - 0.58060 * v;
-    b = y + 2.03211 * u;
-    fragColor = vec4(r, g, b, 1.0);
+    fragColor = yuyvTex(tex2, vUV, 320);
 }