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draw the first triangle

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Lukian 2025-01-28 12:57:36 +01:00
parent 869fa9d59b
commit 3428be29ae
1 changed files with 115 additions and 35 deletions
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150
src/main.cpp
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@ -7,56 +7,136 @@ void processInput(GLFWwindow *window);
int main() int main()
{ {
glfwInit(); glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL); GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
if (window == NULL) if (window == NULL)
{ {
std::cout << "Failed to create GLFW window" << std::endl; std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate(); glfwTerminate();
return -1; return -1;
} }
glfwMakeContextCurrent(window); glfwMakeContextCurrent(window);
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{ {
std::cout << "Failed to initialize GLAD" << std::endl; std::cout << "Failed to initialize GLAD" << std::endl;
return -1; return -1;
} }
glViewport(0, 0, 800, 600); glViewport(0, 0, 800, 600);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback); glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
while(!glfwWindowShouldClose(window)) float vertices[] = {
{ -0.5f, -0.5f, 0.0f,
processInput(window); 0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f
};
glClearColor(0.2f, 0.3f, 0.3f, 1.0f); unsigned int VBO;
glClear(GL_COLOR_BUFFER_BIT); glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glfwSwapBuffers(window); unsigned int VAO;
glfwPollEvents(); glGenVertexArrays(1, &VAO);
} glBindVertexArray(VAO);
glfwTerminate(); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
return 0; const char *vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0";
const char *fragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"void main()\n"
"{\n"
"FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\0";
unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
int success;
char infoLog[512];
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if(!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
}
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if(!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
}
unsigned int shaderProgram;
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if(!success) {
glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
std::cout << "ERROR::SHADER_PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
}
while(!glfwWindowShouldClose(window))
{
processInput(window);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glDrawArrays(GL_TRIANGLES, 0, 3);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
} }
void framebuffer_size_callback(GLFWwindow* window, int width, int height) void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{ {
glViewport(0, 0, width, height); glViewport(0, 0, width, height);
} }
void processInput(GLFWwindow *window) void processInput(GLFWwindow *window)
{ {
if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
{ {
glfwSetWindowShouldClose(window, true); glfwSetWindowShouldClose(window, true);
} }
} }