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add backface culling

This commit is contained in:
Luca Conte 2024-04-04 14:05:28 +02:00
parent a2c33e3c76
commit 56cf731b7f
3 changed files with 34 additions and 9 deletions
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27
u03-4/main.c
View File

@ -40,6 +40,8 @@ typedef struct {
GLuint program;
GLuint vao;
GLfloat rotation;
void init(void) {
// create and compile vertex shader
@ -87,6 +89,10 @@ void init(void) {
printf("%s",infoLog);
}
free(fragmentText);
fragmentText = NULL;
fragmentTextConst = NULL;
// create and link shader program
program = glCreateProgram();
glAttachShader(program, vertexShader);
@ -214,6 +220,7 @@ void init(void) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
}
@ -222,11 +229,22 @@ void draw(void) {
glUseProgram(program);
glBindVertexArray(vao);
rotation = rotation + 0.01f;
if (rotation > 2 * 3.1415926f) {
rotation = 0;
}
glUniform1f(glGetUniformLocation(program, "rotation"), rotation);
glFrontFace(GL_CW);
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
glEnable(GL_PRIMITIVE_RESTART);
glPrimitiveRestartIndex(RESTART);
GLuint indices[] = {0, 1, 2, 3, RESTART, 4, 5, 6, 7, RESTART, 8, 9, 10, 11, RESTART, 12, 13, 14, 15};
GLuint indices[] = {0, 1, 2, 3, RESTART, 4, 6, 5, 7, RESTART, 8, 9, 10, 11, RESTART, 12, 14, 13, 15};
glDrawElements(GL_TRIANGLE_STRIP, sizeof(indices) / sizeof(GLuint), GL_UNSIGNED_INT, indices);
}
@ -236,14 +254,12 @@ void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
}
int main(void) {
printf("Hello World!\n");
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow *window = glfwCreateWindow(800, 800, "Computergrafik 1", NULL, NULL);
GLFWwindow *window = glfwCreateWindow(600, 600, "Computergrafik 1", NULL, NULL);
if (!window) {
printf("Failed to create window\n");
@ -257,6 +273,9 @@ int main(void) {
glewInit();
printf("OpenGL version supported by this platform (%s):\n", glGetString(GL_VERSION));
init();
while (!glfwWindowShouldClose(window)) {

13
u03-4/vertexShader.c
View File

@ -7,7 +7,9 @@ unsigned char vertexShader_glsl[] = {
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0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x29, 0x20, 0x7b, 0x0a, 0x09, 0x66,
@ -15,7 +17,10 @@ unsigned char vertexShader_glsl[] = {
0x20, 0x3d, 0x20, 0x76, 0x65, 0x72, 0x74, 0x65, 0x78, 0x56, 0x61, 0x6c,
0x75, 0x65, 0x3b, 0x0a, 0x09, 0x67, 0x6c, 0x5f, 0x50, 0x6f, 0x73, 0x69,
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0x6f, 0x6e, 0x29, 0x2c, 0x20, 0x61, 0x50, 0x6f, 0x73, 0x69, 0x74, 0x69,
0x6f, 0x6e, 0x2e, 0x79, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x2c, 0x20, 0x31,
0x2e, 0x30, 0x29, 0x3b, 0x0a, 0x7d
};
unsigned int vertexShader_glsl_len = 215;
unsigned int vertexShader_glsl_len = 270;

3
u03-4/vertexShader.glsl
View File

@ -1,8 +1,9 @@
#version 330 core
layout (location = 0) in vec2 aPosition;
layout (location = 1) in float vertexValue;
uniform float rotation;
out float fragmentValue;
void main() {
fragmentValue = vertexValue;
gl_Position = vec4(aPosition, 0.0, 1.0);
gl_Position = vec4(aPosition.x * sin(rotation), aPosition.y, 0.0, 1.0);
}