opengl

commit 45b21710cecd9275479b1cefd7a9870f53a0866c
parent 633aaf0ca205d94558f4231bc3f5874ada89f21a
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sun, 25 Jun 2023 15:10:37 +0900

add shader struct

Diffstat:
M
main.c
 | 
103
++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------

1 file changed, 68 insertions(+), 35 deletions(-)
diff --git a/main.c b/main.c
@@ -12,11 +12,74 @@ float vertices[] = {
 	-0.5, 0.5, 0.0,  0.0, 1.0, 1.0,
 };
 
+char errstr[512];
+
 unsigned int indices[] = {
 	0, 1, 3,
 	1, 2, 3,
 };
 
+typedef struct Shader {
+	unsigned int ID;
+} Shader;
+
+Shader *
+ShaderInit(const char *vertexShaderSource, const char *fragmentShaderSource)
+{
+	unsigned int vertexShader;
+	int success;
+	char log[512];
+	vertexShader = glCreateShader(GL_VERTEX_SHADER);
+	glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
+	glCompileShader(vertexShader);
+	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(vertexShader, sizeof(log), NULL, log);
+		snprintf(errstr, sizeof(errstr),
+			"compile vertex shader: %s\n", log);
+		return NULL;
+	}
+	unsigned int fragmentShader;
+	fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+	glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
+	glCompileShader(fragmentShader);
+	glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(fragmentShader, sizeof(log), NULL, log);
+		snprintf(errstr, sizeof(errstr),
+			"compile fragment shader: %s\n", log);
+		return NULL;
+	}
+	unsigned int shaderProgram;
+	shaderProgram = glCreateProgram();
+	glAttachShader(shaderProgram, vertexShader);
+	glAttachShader(shaderProgram, fragmentShader);
+	glLinkProgram(shaderProgram);
+	glGetShaderiv(shaderProgram, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		glGetShaderInfoLog(shaderProgram, sizeof(log), NULL, log);
+		snprintf(errstr, sizeof(errstr),
+			"link shaders: %s\n", log);
+		return NULL;
+	}
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+	
+	Shader *shader = (Shader *) malloc(sizeof(Shader));
+	shader->ID = shaderProgram;
+	return shader;
+}
+
+void
+ShaderUse(Shader *s) {
+	glUseProgram(s->ID);
+}
+
+void
+ShaderDelete(Shader *s) {
+	glDeleteProgram(s->ID);
+}
+
 const char *vertexShaderSource = "
 	#version 330 core
 	layout (location = 0) in vec3 aPos;
@@ -85,42 +148,12 @@ main(void)
 	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 	
 	// setup shaders
-	unsigned int vertexShader;
-	int success;
-	char log[512];
-	vertexShader = glCreateShader(GL_VERTEX_SHADER);
-	glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
-	glCompileShader(vertexShader);
-	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
-	if (!success) {
-		glGetShaderInfoLog(vertexShader, sizeof(log), NULL, log);
-		fprintf(stderr, "compile vertex shader: %s\n", log);
+	Shader *shader = ShaderInit(vertexShaderSource, fragmentShaderSource);
+	if (shader == NULL) {
+		fprintf(stderr, "init shader: %s\n", errstr);
 		exit(1);
 	}
-	unsigned int fragmentShader;
-	fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
-	glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
-	glCompileShader(fragmentShader);
-	glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
-	if (!success) {
-		glGetShaderInfoLog(fragmentShader, sizeof(log), NULL, log);
-		fprintf(stderr, "compile fragment shader: %s\n", log);
-		exit(1);
-	}
-	unsigned int shaderProgram;
-	shaderProgram = glCreateProgram();
-	glAttachShader(shaderProgram, vertexShader);
-	glAttachShader(shaderProgram, fragmentShader);
-	glLinkProgram(shaderProgram);
-	glGetShaderiv(shaderProgram, GL_COMPILE_STATUS, &success);
-	if (!success) {
-		glGetShaderInfoLog(shaderProgram, sizeof(log), NULL, log);
-		fprintf(stderr, "link shaders: %s\n", log);
-		exit(1);
-	}
-	glUseProgram(shaderProgram);
-	glDeleteShader(vertexShader);
-	glDeleteShader(fragmentShader);
+	ShaderUse(shader);
 	
 	// setup vbo
 	unsigned int VAO, VBO, EBO;
@@ -154,7 +187,7 @@ main(void)
 
 	glDeleteVertexArrays(1, &VAO);
 	glDeleteBuffers(1, &VBO);
-	glDeleteProgram(shaderProgram);	
+	ShaderDelete(shader);	
 	glfwTerminate();
 	return 0;
 }