renderer/opengl: Extract shaders from source (#9600)

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

src/render/shaders/glsl/CM.frag

@@ -0,0 +1,55 @@
+#version 300 es
+//#extension GL_OES_EGL_image_external : require
+#extension GL_ARB_shading_language_include : enable
+
+precision highp float;
+in vec2 v_texcoord;
+uniform sampler2D tex;
+//uniform samplerExternalOES texture0;
+
+uniform int texType; // eTextureType: 0 - rgba, 1 - rgbx, 2 - ext
+// uniform int skipCM;
+uniform int sourceTF; // eTransferFunction
+uniform int targetTF; // eTransferFunction
+uniform mat4x2 sourcePrimaries;
+uniform mat4x2 targetPrimaries;
+
+uniform float alpha;
+
+uniform int discardOpaque;
+uniform int discardAlpha;
+uniform float discardAlphaValue;
+
+uniform int applyTint;
+uniform vec3 tint;
+
+#include "rounding.glsl"
+#include "CM.glsl"
+
+layout(location = 0) out vec4 fragColor;
+void main() {
+    vec4 pixColor;
+    if (texType == 1)
+        pixColor = vec4(texture(tex, v_texcoord).rgb, 1.0);
+//    else if (texType == 2)
+//        pixColor = texture(texture0, v_texcoord);
+    else // assume rgba
+        pixColor = texture(tex, v_texcoord);
+
+    if (discardOpaque == 1 && pixColor[3] * alpha == 1.0)
+        discard;
+
+    if (discardAlpha == 1 && pixColor[3] <= discardAlphaValue)
+        discard;
+
+    // this shader shouldn't be used when skipCM == 1
+    pixColor = doColorManagement(pixColor, sourceTF, sourcePrimaries, targetTF, targetPrimaries);
+
+    if (applyTint == 1)
+        pixColor = vec4(pixColor.rgb * tint.rgb, pixColor[3]);
+
+    if (radius > 0.0)
+        pixColor = rounding(pixColor);
+    
+    fragColor = pixColor * alpha;
+}