initial commit

1 files changed, 390 insertions, 0 deletions

diff --git a/uniform_buffer/uniform_buffer.c b/uniform_buffer/uniform_buffer.c
new file mode 100644
index 0000000..ddd5d33
--- /dev/null
+++ b/uniform_buffer/uniform_buffer.c
@@ -0,0 +1,390 @@
+#include "GL/glew.h"
+#include "GLFW/glfw3.h"
+
+#include "pwyazh.h"
+
+#include "common.h"
+
+#include <unistd.h>
+
+#define WIDTH 1024
+#define HEIGHT 768
+
+static V3F camera_pos;
+static F32 dt;
+static Input input;
+static B32 first_mouse = 1;
+
+void
+key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    switch (action)
+    {
+        case GLFW_PRESS: {
+            switch (key)
+            {
+                case GLFW_KEY_D: {
+                    input.move_right.state = KeyState_PRESS;
+                } break;
+                case GLFW_KEY_W: {
+                    input.move_forward.state = KeyState_PRESS;
+                } break;
+                case GLFW_KEY_A: {
+                    input.move_left.state = KeyState_PRESS;
+                } break;
+                case GLFW_KEY_S: {
+                    input.move_backward.state = KeyState_PRESS;
+                } break;
+                case GLFW_KEY_E: {
+                    input.move_up.state = KeyState_PRESS;
+                } break;
+                case GLFW_KEY_Q: {
+                    input.move_down.state = KeyState_PRESS;
+                } break;
+            }
+        } break;
+
+        case GLFW_RELEASE: {
+            switch (key)
+            {
+                case GLFW_KEY_D: {
+                    input.move_right.state = KeyState_RELEASE;
+                } break;
+                case GLFW_KEY_W: {
+                    input.move_forward.state = KeyState_RELEASE;
+                } break;
+                case GLFW_KEY_A: {
+                    input.move_left.state = KeyState_RELEASE;
+                } break;
+                case GLFW_KEY_S: {
+                    input.move_backward.state = KeyState_RELEASE;
+                } break;
+                case GLFW_KEY_E: {
+                    input.move_up.state = KeyState_RELEASE;
+                } break;
+                case GLFW_KEY_Q: {
+                    input.move_down.state = KeyState_RELEASE;
+                } break;
+            }
+        } break;
+    }
+}
+
+void
+cursor_pos_callback(GLFWwindow* window, double xpos, double ypos)
+{
+    if (first_mouse)
+    {
+        input.last_mouse_pos = v2f(xpos, ypos);
+        first_mouse = 0;
+    }
+    input.mouse_offset = v2f(input.mouse_offset.x+((F32)xpos-input.last_mouse_pos.x),
+                             input.mouse_offset.y+((F32)ypos-input.last_mouse_pos.y));
+    input.last_mouse_pos = v2f((F32)xpos, (F32)ypos);
+}
+
+int
+main(void)
+{
+    GLFWwindow *window;
+    
+    if (glfwInit() == GLFW_FALSE)
+    {
+        fprintf(stderr, "[ERROR] Failed to initialize glfw.\n");
+        return(1);
+    }
+    
+    glfwWindowHint(GLFW_RESIZABLE, 0);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    window = glfwCreateWindow(WIDTH, HEIGHT, "depth testing", 0, 0);
+    if (!window)
+    {
+        fprintf(stderr, "[ERROR] Failed to create window.\n");
+        glfwTerminate();
+        return(1);
+    }
+    
+    glfwMakeContextCurrent(window);
+
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+    
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, cursor_pos_callback);
+    
+    if (glewInit() != GLEW_OK)
+    {
+        fprintf(stderr, "[ERROR] Failed to initialize glew.\n");
+        glfwTerminate();
+        return(1);
+    }
+    
+    U32 skybox_shader = create_shader_program("shaders/skybox.vs", "shaders/skybox.fs");
+    U32 cube_shader = create_shader_program("shaders/cube.vs", "shaders/cube.fs");
+    U32 color_cube_shader = create_shader_program("shaders/color_cube.vs",
+                                                  "shaders/color_cube.fs");
+
+    U32 skybox_matrices = glGetUniformBlockIndex(skybox_shader, "Matrices");
+    U32 cube_matrices = glGetUniformBlockIndex(cube_shader, "Matrices");
+    U32 color_cube_matrices = glGetUniformBlockIndex(color_cube_shader, "Matrices");
+
+    glUniformBlockBinding(skybox_shader, skybox_matrices, 0);
+    glUniformBlockBinding(cube_shader, cube_matrices, 0);
+    glUniformBlockBinding(color_cube_shader, color_cube_matrices, 0);
+
+    U32 matrices_ubo;
+    glGenBuffers(1, &matrices_ubo);
+    glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+    glBufferData(GL_UNIFORM_BUFFER, 2*sizeof(MAT4), 0, GL_STATIC_DRAW);
+    glBindBuffer(GL_UNIFORM_BUFFER, 0);
+    glBindBufferRange(GL_UNIFORM_BUFFER, 0, matrices_ubo, 0, 2*sizeof(MAT4));
+
+    U32 grid_texture = load_texture("../data/textures/grid.png");
+
+    const char *cube_texture_filenames[6] = {
+        "../data/textures/skybox/right.jpg",
+        "../data/textures/skybox/left.jpg",
+        "../data/textures/skybox/top.jpg",
+        "../data/textures/skybox/bottom.jpg",
+        "../data/textures/skybox/front.jpg",
+        "../data/textures/skybox/back.jpg"
+    };
+    U32 skybox_texture = load_cubemap(cube_texture_filenames);
+
+    F32 a = 0.5f;
+    F32 vertices[] = {
+        -a, -a, -a,  0.0f, 0.0f,
+         a, -a, -a,  1.0f, 0.0f,
+         a,  a, -a,  1.0f, 1.0f,
+         a,  a, -a,  1.0f, 1.0f,
+        -a,  a, -a,  0.0f, 1.0f,
+        -a, -a, -a,  0.0f, 0.0f,
+
+        -a, -a,  a,  0.0f, 0.0f,
+         a, -a,  a,  1.0f, 0.0f,
+         a,  a,  a,  1.0f, 1.0f,
+         a,  a,  a,  1.0f, 1.0f,
+        -a,  a,  a,  0.0f, 1.0f,
+        -a, -a,  a,  0.0f, 0.0f,
+ 
+        -a,  a,  a,  1.0f, 0.0f,
+        -a,  a, -a,  1.0f, 1.0f,
+        -a, -a, -a,  0.0f, 1.0f,
+        -a, -a, -a,  0.0f, 1.0f,
+        -a, -a,  a,  0.0f, 0.0f,
+        -a,  a,  a,  1.0f, 0.0f,
+
+         a,  a,  a,  1.0f, 0.0f,
+         a,  a, -a,  1.0f, 1.0f,
+         a, -a, -a,  0.0f, 1.0f,
+         a, -a, -a,  0.0f, 1.0f,
+         a, -a,  a,  0.0f, 0.0f,
+         a,  a,  a,  1.0f, 0.0f,
+
+        -a, -a, -a,  0.0f, 1.0f,
+         a, -a, -a,  1.0f, 1.0f,
+         a, -a,  a,  1.0f, 0.0f,
+         a, -a,  a,  1.0f, 0.0f,
+        -a, -a,  a,  0.0f, 0.0f,
+        -a, -a, -a,  0.0f, 1.0f,
+
+        -a,  a, -a,  0.0f, 1.0f,
+         a,  a, -a,  1.0f, 1.0f,
+         a,  a,  a,  1.0f, 0.0f,
+         a,  a,  a,  1.0f, 0.0f,
+        -a,  a,  a,  0.0f, 0.0f,
+        -a,  a, -a,  0.0f, 1.0f
+    };
+
+    Transform platform_position =
+        transform_make_scale_translate(v3f(10.0f, 0.2f, 10.0f),
+                                       v3f(0.0f, -(a+(a*0.2f)+0.01f), 0.0f));
+
+    U32 cube_vao, vbo;
+    glGenVertexArrays(1, &cube_vao);
+    glBindVertexArray(cube_vao);
+    glGenBuffers(1, &vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)0);
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)(3*sizeof(F32)));
+    glBindVertexArray(0);
+
+    a = 1.0f;
+    F32 skybox_cube_vertices[] = {
+        -a, -a, -a,
+         a, -a, -a,
+         a,  a, -a,
+         a,  a, -a,
+        -a,  a, -a,
+        -a, -a, -a,
+
+        -a, -a,  a,
+         a, -a,  a,
+         a,  a,  a,
+         a,  a,  a,
+        -a,  a,  a,
+        -a, -a,  a,
+ 
+        -a,  a,  a,
+        -a,  a, -a,
+        -a, -a, -a,
+        -a, -a, -a,
+        -a, -a,  a,
+        -a,  a,  a,
+
+         a,  a,  a,
+         a,  a, -a,
+         a, -a, -a,
+         a, -a, -a,
+         a, -a,  a,
+         a,  a,  a,
+
+        -a, -a, -a,
+         a, -a, -a,
+         a, -a,  a,
+         a, -a,  a,
+        -a, -a,  a,
+        -a, -a, -a,
+
+        -a,  a, -a,
+         a,  a, -a,
+         a,  a,  a,
+         a,  a,  a,
+        -a,  a,  a,
+        -a,  a, -a,
+    };
+
+    U32 skybox_cube_vao;
+    glGenVertexArrays(1, &skybox_cube_vao);
+    glBindVertexArray(skybox_cube_vao);
+    glGenBuffers(1, &vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(skybox_cube_vertices), skybox_cube_vertices, GL_STATIC_DRAW);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(F32), (void *)0);
+    glBindVertexArray(0);
+
+    F32 target_fps = 60.0f;
+    F32 target_spf = 1.0f/target_fps;
+    camera_pos = v3f(0.0f, 1.0f, 3.0f);
+    F32 yaw = 0.0f, pitch = 0.0f;
+    
+    F32 last_time = glfwGetTime();
+
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LEQUAL);
+
+    MAT4 view, projection;
+    projection = perspective(90.0f, (F32)WIDTH/(F32)HEIGHT, 0.1f, 100.0f);
+    glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+    glBufferSubData(GL_UNIFORM_BUFFER, 0, sizeof(MAT4), (const void *)&projection);
+    glBindBuffer(GL_UNIFORM_BUFFER, 0);
+    view = mat4_make_translate(v3f_negate(camera_pos));
+    view = mat4_rotate_angles(view, v3f(pitch, yaw, 0.0f));
+
+    while (!glfwWindowShouldClose(window))
+    {
+        glfwPollEvents();
+        
+        /* INFO(pryazha): update */
+
+        V3F left, up, forward;
+        
+        left = v3f(-view.m0.x, -view.m1.x, -view.m2.x);
+        up = v3f(view.m0.y, view.m1.y, view.m2.y);
+        forward = v3f(-view.m0.z, -view.m1.z, -view.m2.z);
+        
+        V3F dp = v3f_zero();
+        F32 speed = 2.0f;
+        if (key_is_pressed(input.move_right))
+            dp = v3f_add(dp, v3f_scalef(left, -speed*dt));
+        if (key_is_pressed(input.move_forward))
+            dp = v3f_add(dp, v3f_scalef(forward, speed*dt));
+        if (key_is_pressed(input.move_left))
+            dp = v3f_add(dp, v3f_scalef(left, speed*dt));
+        if (key_is_pressed(input.move_backward))
+            dp = v3f_add(dp, v3f_scalef(forward, -speed*dt));
+        if (key_is_pressed(input.move_up))
+            dp = v3f_add(dp, v3f_scalef(up, speed*dt));
+        if (key_is_pressed(input.move_down))
+            dp = v3f_add(dp, v3f_scalef(up, -speed*dt));
+        input_update_last_state(&input);
+        camera_pos = v3f_add(camera_pos, dp);
+
+        /* NOTE(pryazha): Mouse handling */
+        F32 sensitivity = 0.1f;
+        input.mouse_offset = v2f_scalef(input.mouse_offset, sensitivity);
+        yaw += input.mouse_offset.x;
+        pitch += input.mouse_offset.y;
+        if (pitch > 89.0f)
+            pitch = 89.0f;
+        if (pitch < -89.0f)
+            pitch = -89.0f;
+        input.mouse_offset = v2f_zero();
+
+        view = mat4_make_translate(v3f_negate(camera_pos));
+        view = mat4_rotate_angles(view, v3f(pitch, yaw, 0.0f));
+        glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+        glBufferSubData(GL_UNIFORM_BUFFER, sizeof(MAT4), sizeof(MAT4), (const void *)&view);
+        glBindBuffer(GL_UNIFORM_BUFFER, 0);
+        
+        /* NOTE(pryazha): Render */
+        glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        glUseProgram(cube_shader);
+        shader_set_mat4fv(cube_shader, "model", mat4_make_translate(v3f(-2.0f, 0.0f, 0.0f)));
+        glBindTexture(GL_TEXTURE_2D, grid_texture);
+        glBindVertexArray(cube_vao);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindTexture(GL_TEXTURE_2D, 0);
+        glBindVertexArray(0);
+
+        glUseProgram(cube_shader);
+        shader_set_mat4fv(cube_shader, "model", transform_apply(platform_position));
+        glBindTexture(GL_TEXTURE_2D, grid_texture);
+        glBindVertexArray(cube_vao);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindTexture(GL_TEXTURE_2D, 0);
+        glBindVertexArray(0);
+
+        glUseProgram(color_cube_shader);
+        shader_set_mat4fv(cube_shader, "model", mat4_make_translate(v3f(2.0f, 0.0f, 0.0f)));
+        glBindVertexArray(cube_vao);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        glUseProgram(skybox_shader);
+        MAT4 rotate_view = mat4_identity();
+        rotate_view.m0 = v4f(view.m0.x, view.m0.y, view.m0.z, 0.0f);
+        rotate_view.m1 = v4f(view.m1.x, view.m1.y, view.m1.z, 0.0f);
+        rotate_view.m2 = v4f(view.m2.x, view.m2.y, view.m2.z, 0.0f);
+        glBindBuffer(GL_UNIFORM_BUFFER, matrices_ubo);
+        glBufferSubData(GL_UNIFORM_BUFFER, sizeof(MAT4), sizeof(MAT4), (const void *)&rotate_view);
+        glBindBuffer(GL_UNIFORM_BUFFER, 0);
+        glBindVertexArray(skybox_cube_vao);
+        glBindTexture(GL_TEXTURE_CUBE_MAP, skybox_texture);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        glfwSwapBuffers(window);
+
+        F32 elapsed = glfwGetTime()-last_time;
+        if (elapsed < target_spf)
+        {
+            U32 sleep_time = (U32)(target_spf-elapsed);
+            if (sleep_time > 0)
+                sleep(sleep_time);
+        }
+        F32 current_time = glfwGetTime();
+        dt = current_time-last_time;
+        last_time = current_time;
+    }
+
+    glfwTerminate();
+    return(0);
+}