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Hello Triangle Exercises

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This commit is contained in:
Joseph Ferano 2023-10-14 16:16:20 +07:00
parent 32228da922
commit 1fe26cd9a4
1 changed files with 60 additions and 31 deletions
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91
main.c
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@ -28,7 +28,7 @@ void framebuffer_size_callback(GLFWwindow* window, int width, int height)
glViewport(0, 0, width, height);
SCREEN_WIDTH = width;
SCREEN_HEIGHT = height;
}
}
void processInput(GLFWwindow *window)
{
@ -107,33 +107,60 @@ int main(void) {
checkCode(success, "Failed to link shader program");
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
glDeleteShader(fragmentShader);
float vertices[] = {
0.5f, 0.5f, 0.0f, // top right
0.5f, -0.5f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, // bottom left
-0.5f, 0.5f, 0.0f // top left
// float vertices[] = {
// 0.5f, 0.5f, 0.0f, // top right
// 0.5f, -0.5f, 0.0f, // bottom right
// -0.5f, -0.5f, 0.0f, // bottom left
// -0.5f, 0.5f, 0.0f // top left
// };
// unsigned int indices[] = { // note that we start from 0!
// 0, 1, 3, // first triangle
// 1, 2, 3 // second triangle
// };
// float vertices[] = {
// -0.5f, -0.5f, 0.0f,
// 0.5f, -0.5f, 0.0f,
// 0.0f, 0.5f, 0.0f
// };
float v1[] = {
-1.0f, -0.5f, 0.0f, // -0.5, -0.5
0.0f, -0.5f, 0.0f,// 0.5, -0.5
-0.5f, 0.5f, 0.0f// 0.0, 0.5
};
unsigned int indices[] = { // note that we start from 0!
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &EBO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
float v2[] = {
0.0f, -0.5f, 0.0f,
1.0f, -0.5f, 0.0f,
0.5f, 0.5f, 0.0f
};
GLuint vaos[2];
GLuint vbos[2];
unsigned int VBO1, VBO2, EBO;
glGenVertexArrays(2, vaos);
// glGenBuffers(1, &EBO);
glGenBuffers(2, vbos);
glBindVertexArray(vaos[0]);
glBindBuffer(GL_ARRAY_BUFFER, vbos[0]);
glBufferData(GL_ARRAY_BUFFER, sizeof(v1), v1, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(0);
glBindVertexArray(vaos[1]);
glBindBuffer(GL_ARRAY_BUFFER, vbos[1]);
glBufferData(GL_ARRAY_BUFFER, sizeof(v2), v2, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
// glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glBindVertexArray(0);
while (!glfwWindowShouldClose(window)) {
processInput(window);
@ -141,20 +168,22 @@ int main(void) {
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
// glDrawArrays(GL_TRIANGLES, 0, 3);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glBindVertexArray(vaos[0]);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindVertexArray(vaos[1]);
glDrawArrays(GL_TRIANGLES, 0, 3);
// glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
// glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
// glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glfwSwapBuffers(window);
glfwPollEvents();
glfwPollEvents();
}
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glDeleteVertexArrays(2, vaos);
glDeleteBuffers(1, &VBO1);
glDeleteBuffers(1, &VBO2);
glDeleteProgram(shaderProgram);
glfwTerminate();
return 0;