triangle

CMakeLists.txt

@@ -1,7 +1,7 @@
 project(minecraft-clone C)
 cmake_minimum_required(VERSION 3.9)
 set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
-include_directories(lib/glad/include lib/advanced_C_standard_liberary/include)
+include_directories(lib/glad/include lib/advanced_C_standard_liberary/include include)
 file(GLOB SOURCES "src/*.c" "lib/*/src/*.c")
 find_program(CCACHE_PROGRAM ccache)
 add_executable(test.out ${SOURCES})

include/main.h

@@ -4,5 +4,6 @@
 #include <GLFW/glfw3.h>
 void glfwError(int id, const char *description);
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);  
-unsigned int parseShader(const char *filePath);
+unsigned int parseShader(const char *filePath, const GLenum shaderType);
+unsigned int linkShader(unsigned int vertexShader, unsigned int fragmentShader);
 #endif

shader/test.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 FragColor;
+
+void main()
+{
+    FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+} 

shader/test.vert

@@ -0,0 +1,7 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+void main()
+{
+    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}

src/main.c

@@ -4,6 +4,7 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 #include "main.h"
+#include <acl/file.h>
 
 int main() {
 	if(!glfwInit()) {
@@ -36,13 +37,27 @@ int main() {
 		0.5f, -0.5f, 0.0f,
 		0.0f,  0.5f, 0.0f
 	};
+	// parse shader
+	unsigned int vertexShader = parseShader("shader/test.vert", GL_VERTEX_SHADER);
+	unsigned int fragmentShader = parseShader("shader/test.frag", GL_FRAGMENT_SHADER);
+	unsigned int shaderProgram = linkShader(vertexShader, fragmentShader);
+	glUseProgram(shaderProgram);
 	unsigned int VBO;
 	glGenBuffers(1, &VBO);  
 	glBindBuffer(GL_ARRAY_BUFFER, VBO);
 	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	unsigned int VAO;
+	glGenVertexArrays(1, &VAO);
+	glBindVertexArray(VAO);
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+	glEnableVertexAttribArray(0);
 	while(!glfwWindowShouldClose(window)) {
-		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+		glUseProgram(shaderProgram);
-		glClear(GL_COLOR_BUFFER_BIT);
+		glBindVertexArray(VAO);
+		glDrawArrays(GL_TRIANGLES, 0, 3);
 		glfwSwapBuffers(window);
 		glfwPollEvents();    
 	}
@@ -56,28 +71,44 @@ void glfwError(int id, const char* description) {
 void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
 	glViewport(0, 0, width, height);
 }
-unsigned int parseShader(const char *filePath) {
+unsigned int parseShader(const char *filePath, const GLenum shaderType) {
-	FILE *fp = fopen(filePath, "rb");
+	bool success;
-	size_t lSize;
+	unsigned int ShaderId;
-	char *buffer;
+	char *ShaderSrc = acl_ReadTextFile(filePath, &success);
-	if(!fp) {
+	if(!success) {
-		perror(filePath);
+		printf("Failed to read Shader: %s", filePath);
+		glfwTerminate();
+		exit(-1);
 	}
-	fseek(fp, 0L, SEEK_END);
+	ShaderId = glCreateShader(shaderType);
-	lSize = ftell(fp);
+	const char *tmpShaderSrc = ShaderSrc;
-	rewind(fp);
+	glShaderSource(ShaderId, 1, &tmpShaderSrc, NULL);
-	buffer = malloc(lSize + 1);
+	glCompileShader(ShaderId);
-	if(!buffer) {
+	free(ShaderSrc);
-		fclose(fp);
+	int compileSuccess;
-		printf("out of memory");
+	glGetShaderiv(ShaderId, GL_COMPILE_STATUS, &compileSuccess);
-		exit(1);
+	if(!compileSuccess) {
+		char infoLog[512];
+		glGetShaderInfoLog(ShaderId, 512, NULL, infoLog);
+		printf("Failed to compile Shader: %s Error: %s", filePath, infoLog);
 	}
-	size_t readReturn = fread(buffer, lSize, 1, fp);
+	return ShaderId;
-	fclose(fp);
+}
-	if(readReturn != 1) {
+unsigned int linkShader(unsigned int vertexShader, unsigned int fragmentShader) {
-		printf("Can't read Shader");
+	unsigned int shaderProgram = glCreateProgram();
-		exit(1);
+	glAttachShader(shaderProgram, vertexShader);
-	}
+	glAttachShader(shaderProgram, fragmentShader);
-	printf("%s", buffer);
+	glLinkProgram(shaderProgram);
-	return 0;
+	int success;
+	glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
+	if(!success) {
+		char infoLog[512];
+		glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
+		printf("Failed to link Shader. Error: %s", infoLog);
+		glfwTerminate();
+		exit(-1);
+	}
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+	return shaderProgram;
 }