Added function to compile multiple shaders and prospective code for multiple programs (WIP)

src/main.c

@@ -71,6 +71,9 @@ void handleInputs(double deltaTime) {
     if (glfwGetKey(window, GLFW_KEY_4) == GLFW_PRESS) {
         cameraPosition = (vec3){-0.6f, 2.1f, -4.5f};
     }
+    if (glfwGetKey(window, GLFW_KEY_5) == GLFW_PRESS) {
+        cameraPosition = (vec3){-10.6f, 22.1f, -4.5f};
+    }
     if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
         cameraPosition.z += deltaTime * 10;
     }
@@ -161,8 +164,6 @@ void renderNode(SceneNode* node) {
 
 void init(void) {
     //IDEE: shader in array speichern und dann so kompilieren etc
-    GLuint vertexShader;
-    GLuint fragmentShader;
     GLint status;
 
     Shader shaders[2] = {
@@ -170,8 +171,13 @@ void init(void) {
         {GL_FRAGMENT_SHADER, 0}
     };
 
-    compileShader(vertexShader_glsl, &shaders[0]);
-    compileShader(fragmentShader_glsl, &shaders[1]);
+    const GLchar* shaderSources[2] = {
+        vertexShader_glsl,
+        fragmentShader_glsl
+    };
+
+    int numShaders = sizeof(shaders) / sizeof(Shader);
+    compileShaders(shaders, shaderSources, numShaders);
 
     program = glCreateProgram();
 

src/shader.c

@@ -1,13 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
-
 #include <GL/glew.h>
-#include <GLFW/glfw3.h>
-
-typedef struct {
-    GLenum type;
-    GLuint id;
-} Shader;
+#include "shader.h"
 
 void compileShader(const GLchar *shaderSource, Shader *shader) {
     shader->id = glCreateShader(shader->type);
@@ -27,3 +21,50 @@ void compileShader(const GLchar *shaderSource, Shader *shader) {
         exit(1);
     }
 }
+
+void compileShaders(Shader* shaders, const GLchar** glslSources, int numShaders) {
+    for (int i = 0; i < numShaders; i++) {
+        compileShader(glslSources[i], &shaders[i]);
+    }
+}
+
+ShaderProgram createShaderProgram(const GLchar* vertexSource, const GLchar* fragmentSource) {
+    Shader vertexShader = { GL_VERTEX_SHADER, 0 };
+    Shader fragmentShader = { GL_FRAGMENT_SHADER, 0 };
+
+    const GLchar* shaderSources[2] = { vertexSource, fragmentSource };
+    Shader shaders[2] = { vertexShader, fragmentShader };
+
+    compileShaders(shaders, shaderSources, 2);
+
+    GLuint program = glCreateProgram();
+    glAttachShader(program, shaders[0].id);
+    glAttachShader(program, shaders[1].id);
+    glLinkProgram(program);
+
+    GLint status;
+    glGetProgramiv(program, GL_LINK_STATUS, &status);
+
+    if (!status) {
+        printf("Error linking program: ");
+        GLchar infoLog[1024];
+        glGetProgramInfoLog(program, 1024, NULL, infoLog);
+        printf("%s\n", infoLog);
+        exit(1);
+    }
+    
+    glValidateProgram(program);
+
+    glGetProgramiv(program, GL_VALIDATE_STATUS, &status);
+
+    if (!status) {
+        printf("Error validating program: ");
+        GLchar infoLog[1024];
+        glGetProgramInfoLog(program, 1024, NULL, infoLog);
+        printf("%s\n", infoLog);
+        exit(1);
+    }
+
+    ShaderProgram shaderProgram = { program, vertexSource, fragmentSource };
+    return shaderProgram;
+}

src/shader.h

@@ -8,6 +8,14 @@ typedef struct {
     GLuint id;
 } Shader;
 
+typedef struct {
+    GLuint program;
+    const GLchar* vertexSource;
+    const GLchar* fragmentSource;
+} ShaderProgram;
+
 void compileShader(const GLchar *shaderSource, Shader *shader);
+void compileShaders(Shader* shaders, const GLchar** glslSources, int numShaders);
+ShaderProgram createShaderProgram(const GLchar* vertexSource, const GLchar* fragmentSource);
 
 #endif