From a711521f1770823d4e8c284308867981e412da5b Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Sat, 21 Sep 2024 18:01:11 +0100
Subject: [PATCH] Load shaders from file

---
 shaders/frag.glsl |  7 +++++++
 shaders/vert.glsl |  7 +++++++
 src/main.cc       | 45 ++++++++++++++++++++++++++-------------------
 3 files changed, 40 insertions(+), 19 deletions(-)
 create mode 100644 shaders/frag.glsl
 create mode 100644 shaders/vert.glsl

diff --git a/shaders/frag.glsl b/shaders/frag.glsl
new file mode 100644
index 0000000..249ff80
--- /dev/null
+++ b/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);
+};
diff --git a/shaders/vert.glsl b/shaders/vert.glsl
new file mode 100644
index 0000000..27d159c
--- /dev/null
+++ b/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);
+};
diff --git a/src/main.cc b/src/main.cc
index 2354d92..7ed3a65 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -41,13 +41,14 @@ struct App {
   bool          running;
 };
 
-int    init                    (App &app);
-void   create_vertex_spec      (App &app);
-void   create_graphics_pipeline(App &app);
-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);
+int         init                    (App &app);
+void        create_vertex_spec      (App &app);
+void        create_graphics_pipeline(App &app);
+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;
+}