feat(shaders): Implement FrostedGlassShader compilation in ShaderManager

src/shader_manager.py

@@ -5,6 +5,7 @@ class ShaderManager:
   self.program = None
   self.bg_program = None
   self.pp_program = None
+  self.blur_program = None
 
  def compile_shader(self, vertex_src: str, fragment_src: str) -> int:
   program = gl.glCreateProgram()
@@ -151,3 +152,51 @@ void main() {
   gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, 4)
   gl.glBindTexture(gl.GL_TEXTURE_2D, 0)
   gl.glUseProgram(0)
+
+ def setup_frosted_glass_shader(self):
+  vertex_src = """
+#version 330 core
+const vec2 positions[4] = vec2[](
+ vec2(-1.0, -1.0),
+ vec2( 1.0, -1.0),
+ vec2(-1.0,  1.0),
+ vec2( 1.0,  1.0)
+);
+const vec2 uvs[4] = vec2[](
+ vec2(0.0, 0.0),
+ vec2(1.0, 0.0),
+ vec2(0.0, 1.0),
+ vec2(1.0, 1.0)
+);
+out vec2 v_uv;
+void main() {
+ gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);
+ v_uv = uvs[gl_VertexID];
+}
+"""
+  fragment_src = """
+#version 330 core
+in vec2 v_uv;
+uniform sampler2D u_texture;
+uniform float u_blur_radius;
+uniform float u_tint_intensity;
+uniform float u_opacity;
+out vec4 FragColor;
+void main() {
+ vec2 res = vec2(textureSize(u_texture, 0));
+ vec2 offset = u_blur_radius / res;
+ vec4 sum = vec4(0.0);
+ sum += texture(u_texture, v_uv + vec2(-offset.x, -offset.y)) * 0.0625;
+ sum += texture(u_texture, v_uv + vec2(0.0, -offset.y)) * 0.125;
+ sum += texture(u_texture, v_uv + vec2(offset.x, -offset.y)) * 0.0625;
+ sum += texture(u_texture, v_uv + vec2(-offset.x, 0.0)) * 0.125;
+ sum += texture(u_texture, v_uv + vec2(0.0, 0.0)) * 0.25;
+ sum += texture(u_texture, v_uv + vec2(offset.x, 0.0)) * 0.125;
+ sum += texture(u_texture, v_uv + vec2(-offset.x, offset.y)) * 0.0625;
+ sum += texture(u_texture, v_uv + vec2(0.0, offset.y)) * 0.125;
+ sum += texture(u_texture, v_uv + vec2(offset.x, offset.y)) * 0.0625;
+ vec3 tinted = mix(sum.rgb, vec3(1.0), u_tint_intensity);
+ FragColor = vec4(tinted, sum.a * u_opacity);
+}
+"""
+  self.blur_program = self.compile_shader(vertex_src, fragment_src)