abdelrahman/mike-shah-opengl-series
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Load shaders from file

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Abdelrahman Said 2024-09-21 18:01:11 +01:00
parent 0b7da3fad7
commit a711521f17
3 changed files with 40 additions and 19 deletions
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7
shaders/frag.glsl Normal file
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@ -0,0 +1,7 @@
#version 460 core
out vec4 color;
void main() {
color = vec4(0.93f, 0.42f, 0.35f, 1.0f);
};

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

45
src/main.cc
View File

@ -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;
}