Load shaders from file

shaders/frag.glsl

@@ -0,0 +1,7 @@
+#version 460 core
+
+out vec4 color;
+
+void main() {
+  color = vec4(0.93f, 0.42f, 0.35f, 1.0f);
+};

shaders/vert.glsl

@@ -0,0 +1,7 @@
+#version 460 core
+
+in vec4 position;
+
+void main() {
+  gl_Position = vec4(position.x, position.y, position.z, position.w);
+};

src/main.cc

@@ -48,6 +48,7 @@ void   run_main_loop           (App &app);
 void        cleanup                 (App &app);
 GLuint      create_shader_program   (const std::string &vertex_shader_source, const std::string &fragment_shader_source);
 GLuint      compile_shader          (GLuint type, const std::string &source);
+std::string load_shader             (const std::string &filepath);
 
 int main() {
   App app    = {};
@@ -148,18 +149,8 @@ void create_vertex_spec(App &app) {
 }
 
 void create_graphics_pipeline(App &app) {
-  const std::string vs_source =
-    "#version 460 core\n"
-    "in vec4 position;\n"
-    "void main() {\n"
-    "  gl_Position = vec4(position.x, position.y, position.z, position.w);\n"
-    "}";
-  const std::string fs_source =
-    "#version 460 core\n"
-    "out vec4 color;\n"
-    "void main() {\n"
-    "  color = vec4(0.93f, 0.42f, 0.35f, 1.0f);\n"
-    "}";
+  const std::string vs_source = load_shader("shaders/vert.glsl");
+  const std::string fs_source = load_shader("shaders/frag.glsl");
 
   app.shader_program = create_shader_program(vs_source, fs_source);
 }
@@ -256,3 +247,19 @@ GLuint compile_shader(GLuint type, const std::string &source) {
 
   return shader;
 }
+
+std::string load_shader(const std::string &filepath) {
+  FILE *fp = fopen(filepath.c_str(), "r");
+  if (!fp) {
+    return "";
+  }
+
+  std::string output = {};
+
+  char buf[1024] = {0};
+  while (fgets(buf, sizeof(buf), fp)) {
+    output += buf;
+  }
+
+  return output;
+}