change shaderSercve so it can take both of char* and std::filesystem::path

include/shader.h

@@ -0,0 +1,46 @@
+#ifndef SHADER_H
+#define SHADER_H
+#include <string_view>
+constexpr std::string_view vSource = R"(
+    #version 330 core
+
+    layout (location = 0) in vec3 aPos;
+    layout (location = 1) in vec2 aTexCoord;
+
+    out vec2 TexCoord;
+
+    void main()
+    {
+        gl_Position = vec4(aPos, 1.0);
+        TexCoord = vec2(aTexCoord.x, aTexCoord.y);
+    }
+)";
+constexpr std::string_view fSource = R"(
+    #version 330 core
+
+    out vec4 FragColor;
+
+    in vec2 TexCoord;
+
+    uniform sampler2D textureY;
+    uniform sampler2D textureU;
+    uniform sampler2D textureV;
+
+    void main(){
+        vec3 yuv, rgb;
+        vec3 yuv2r = vec3(1.164, 0.0, 1.596);
+        vec3 yuv2g = vec3(1.164, -0.391, -0.813);
+        vec3 yuv2b = vec3(1.164, 2.018, 0.0);
+        yuv.x = texture(textureY, TexCoord).r - 0.0625;
+        yuv.y = texture(textureU, TexCoord).r - 0.5;
+        yuv.z = texture(textureV, TexCoord).r - 0.5;
+
+        rgb.x = dot(yuv, yuv2r);
+        rgb.y = dot(yuv, yuv2g);
+        rgb.z = dot(yuv, yuv2b);
+
+        FragColor = vec4(rgb, 1.0);
+    }
+)";
+
+#endif