hippoz/opengl-stuff
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add camera

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hippoz 2023-07-05 18:37:46 +03:00
parent f1cfe964a8
commit eefee6537a
Signed by: hippoz
GPG key ID: 56C4E02A85F2FBED
3 changed files with 164 additions and 26 deletions
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3
.gitmodules vendored Normal file
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@ -0,0 +1,3 @@
[submodule "src/vendor/glm"]
path = src/vendor/glm
url = https://github.com/g-truc/glm

186
src/main.cpp
View file

@ -1,11 +1,24 @@
#include <cstdio>
#include <iostream>
#include <functional>
#include "vendor/glad/glad.h"
#include "vendor/glm/glm/ext/matrix_transform.hpp"
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>
#define QOI_IMPLEMENTATION
#include "vendor/qoi.h"
#include "vendor/glm/glm/vec3.hpp"
#include "vendor/glm/glm/vec4.hpp"
#include "vendor/glm/glm/trigonometric.hpp"
#include "vendor/glm/glm/geometric.hpp"
#include "vendor/glm/glm/mat4x4.hpp"
#include "vendor/glm/glm/gtc/type_ptr.hpp"
std::function<void(int width, int height)> framebuffer_size_callback = nullptr;
std::function<void(double x, double y)> cursor_position_callback = nullptr;
unsigned int create_shader(unsigned int type, const char **source)
{
unsigned int shader = glCreateShader(type);
@ -63,11 +76,6 @@ unsigned int create_program(const char *vertex_shader_source, const char *fragme
return program;
}
void framebuffer_size_callback(GLFWwindow *window, int width, int height)
{
glViewport(0, 0, width, height);
}
int main()
{
qoi_desc fish_desc;
@ -91,33 +99,81 @@ int main()
gladLoadGL();
glfwSwapInterval(1);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetFramebufferSizeCallback(window, [](GLFWwindow *_, int width, int height) {
if (framebuffer_size_callback) {
framebuffer_size_callback(width, height);
}
});
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
glfwSetCursorPosCallback(window, [](GLFWwindow *_, double x, double y) {
if (cursor_position_callback) {
cursor_position_callback(x, y);
}
});
glEnable(GL_DEPTH_TEST);
float verts[] = {
// position // color // texture coords
0.0f, 0.5f, 1.0f, 0.0f, 0.0f, 0.5f, 1.0f,
-0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
static const char *vertex_shader_source = ""
"#version 330 core\n"
"layout (location = 0) in vec2 aPos;\n"
"layout (location = 1) in vec3 aColor;\n"
"layout (location = 2) in vec2 aTexCoord;\n"
"out vec3 fragColor;\n"
"layout (location = 0) in vec3 aPos;\n"
"layout (location = 1) in vec2 aTexCoord;\n"
"out vec2 TexCoord;\n"
"uniform mat4 model;\n"
"uniform mat4 view;\n"
"uniform mat4 projection;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, 0.0, 1.0);\n"
" fragColor = aColor;\n"
" gl_Position = projection * view * model * vec4(aPos, 1.0);\n"
" TexCoord = aTexCoord;\n"
"}\0";
static const char *fragment_shader_source = ""
"#version 330 core\n"
"in vec3 fragColor;\n"
"in vec2 TexCoord;\n"
"out vec4 FragColor;\n"
"uniform sampler2D tex;\n"
@ -143,26 +199,104 @@ int main()
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(verts), &verts, GL_STATIC_DRAW);
// 2D position
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (const void*)0);
// position
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
// RGB color
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (const void*)(2 * sizeof(float)));
// texture coords
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// texture coords
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 7 * sizeof(float), (const void*)(5 * sizeof(float)));
glEnableVertexAttribArray(2);
glm::mat4 projection = glm::mat4(1.0f);
glm::vec3 camera_position = glm::vec3(0.0f, 0.0f, 3.0f);
glm::vec3 camera_front = glm::vec3(0.0f, 0.0f, -1.0f);
glm::vec3 camera_up = glm::vec3(0.0f, 1.0f, 0.0f);
glm::vec3 camera_down = glm::vec3(0.0f, -1.0f, 0.0f);
double camera_pitch = 0.0f;
double camera_yaw = 0.0f;
double last_mouse_x, last_mouse_y = 0.0f;
bool mouse_moved_once = false;
framebuffer_size_callback = [&projection, program](int width, int height) {
projection = glm::perspective(glm::radians(45.0f), (float)width / (float)height, 0.1f, 100.0f);
glUniformMatrix4fv(glGetUniformLocation(program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glViewport(0, 0, width, height);
};
cursor_position_callback = [&mouse_moved_once, &last_mouse_x, &last_mouse_y, &camera_pitch, &camera_yaw, &camera_front](double x, double y) {
if (!mouse_moved_once) {
mouse_moved_once = true;
last_mouse_x = x;
last_mouse_y = y;
}
double x_offset = (x - last_mouse_x) * 0.15;
double y_offset = (last_mouse_y - y) * 0.15;
camera_yaw += x_offset;
camera_pitch += y_offset;
if (camera_pitch > 89.0f)
camera_pitch = 89.0f;
if (camera_pitch < -89.0f)
camera_pitch = -89.0f;
double pitch_factor = cos(glm::radians(camera_pitch));
camera_front = (glm::vec3){
cos(glm::radians(camera_yaw)) * pitch_factor,
sin(glm::radians(camera_pitch)),
sin(glm::radians(camera_yaw)) * pitch_factor
};
last_mouse_x = x;
last_mouse_y = y;
};
float delta_time = 0.0f;
float last_frame_time = 0.0f;
while (!glfwWindowShouldClose(window)) {
float current_frame_time = glfwGetTime();
delta_time = current_frame_time - last_frame_time;
last_frame_time = current_frame_time;
const float camera_speed = 2.0f * delta_time; // adjust accordingly
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
camera_position += camera_speed * camera_front;
}
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
camera_position -= camera_speed * camera_front;
}
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS) {
camera_position -= glm::normalize(glm::cross(camera_front, camera_up)) * camera_speed;
}
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
camera_position += glm::normalize(glm::cross(camera_front, camera_up)) * camera_speed;
}
if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS) {
camera_position += camera_speed * camera_up;
}
if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS) {
camera_position += camera_speed * camera_down;
}
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 view = glm::lookAt(camera_position, camera_position + camera_front, camera_up);
glUseProgram(program);
glUniformMatrix4fv(glGetUniformLocation(program, "view"), 1, GL_FALSE, glm::value_ptr(view));
glBindTexture(GL_TEXTURE_2D, texture);
glBindVertexArray(vertex_array);
glDrawArrays(GL_TRIANGLES, 0, 3);
for (int i = 0; i < 12; i++) {
glm::mat4 model = glm::translate(glm::mat4(1.0), glm::vec3(2 * i, 0.0f, 0.0f));
glUniformMatrix4fv(glGetUniformLocation(program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 36);
}
glfwSwapBuffers(window);
glfwPollEvents();

1
src/vendor/glm vendored Submodule

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Subproject commit 5c46b9c07008ae65cb81ab79cd677ecc1934b903