fix shader

CMakeLists.txt

@@ -15,6 +15,7 @@ set(SOURCE
 
 set(SHADERS
     src/shader/main.frag
+    src/shader/main.vert
 )
 
 #########################################################

src/engine/shader/Shader.cpp

@@ -7,6 +7,10 @@ Shader::~Shader() {
 }
 
 void Shader::compile() {
+    if (shaderId) {
+        return;
+    }
+
     this->shaderId = glCreateShader(this->shaderType);
     const char* s = this->source.c_str();
     glShaderSource(this->shaderId, 1, &s, 0);

src/engine/shader/ShaderProgram.cpp

@@ -33,6 +33,7 @@ void ShaderProgram::link() {
     this->programId = glCreateProgram();
 
     for (auto& s : this->shaders) {
+        s->compile();
         glAttachShader(this->programId, s->getShaderId());
     }
 

src/main.cpp

@@ -15,9 +15,15 @@ int main(int argc, char** argv) {
     win->create();
 
     ShaderProgram p1;
-    ShaderLoader sl(GL_FRAGMENT_SHADER, "shader/main.frag");
-    Shader s(sl);
-    p1.shaders.push_back(std::make_shared<Shader>(s));
+
+    ShaderLoader loadMainVertex(GL_VERTEX_SHADER, "shader/main.vert");
+    Shader mainVertex(loadMainVertex);
+    p1.shaders.push_back(std::make_shared<Shader>(mainVertex));
+
+    ShaderLoader loadMainFrag(GL_FRAGMENT_SHADER, "shader/main.frag");
+    Shader mainFrag(loadMainFrag);
+    p1.shaders.push_back(std::make_shared<Shader>(mainFrag));
+
     p1.link();
 
     while (win->loop()) {

src/shader/main.frag

@@ -1,4 +1,7 @@
-#version 450
+#version 450 core
 
-void main {
+out vec4 color;
+
+void main() {
+    color = vec4(0.5, 0.0, 0.0, 1.0);
 }

src/shader/main.vert

@@ -0,0 +1,7 @@
+#version 450 core 
+
+layout (location = 0) in vec3 aPos;
+
+void main() {
+    gl_Position = vec4(aPos, 1.0);
+}