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Diffstat (limited to '3rdparty/glfw/source/examples/wave.c')
| -rw-r--r-- | 3rdparty/glfw/source/examples/wave.c | 463 |
1 files changed, 0 insertions, 463 deletions
diff --git a/3rdparty/glfw/source/examples/wave.c b/3rdparty/glfw/source/examples/wave.c deleted file mode 100644 index d7ead49..0000000 --- a/3rdparty/glfw/source/examples/wave.c +++ /dev/null @@ -1,463 +0,0 @@ -/***************************************************************************** - * Wave Simulation in OpenGL - * (C) 2002 Jakob Thomsen - * http://home.in.tum.de/~thomsen - * Modified for GLFW by Sylvain Hellegouarch - [email protected] - * Modified for variable frame rate by Marcus Geelnard - * 2003-Jan-31: Minor cleanups and speedups / MG - * 2010-10-24: Formatting and cleanup - Camilla Löwy - *****************************************************************************/ - -#if defined(_MSC_VER) - // Make MS math.h define M_PI - #define _USE_MATH_DEFINES -#endif - -#include <stdio.h> -#include <stdlib.h> -#include <math.h> - -#define GLAD_GL_IMPLEMENTATION -#include <glad/gl.h> -#define GLFW_INCLUDE_NONE -#include <GLFW/glfw3.h> - -#include <linmath.h> - -// Maximum delta T to allow for differential calculations -#define MAX_DELTA_T 0.01 - -// Animation speed (10.0 looks good) -#define ANIMATION_SPEED 10.0 - -GLfloat alpha = 210.f, beta = -70.f; -GLfloat zoom = 2.f; - -double cursorX; -double cursorY; - -struct Vertex -{ - GLfloat x, y, z; - GLfloat r, g, b; -}; - -#define GRIDW 50 -#define GRIDH 50 -#define VERTEXNUM (GRIDW*GRIDH) - -#define QUADW (GRIDW - 1) -#define QUADH (GRIDH - 1) -#define QUADNUM (QUADW*QUADH) - -GLuint quad[4 * QUADNUM]; -struct Vertex vertex[VERTEXNUM]; - -/* The grid will look like this: - * - * 3 4 5 - * *---*---* - * | | | - * | 0 | 1 | - * | | | - * *---*---* - * 0 1 2 - */ - -//======================================================================== -// Initialize grid geometry -//======================================================================== - -void init_vertices(void) -{ - int x, y, p; - - // Place the vertices in a grid - for (y = 0; y < GRIDH; y++) - { - for (x = 0; x < GRIDW; x++) - { - p = y * GRIDW + x; - - vertex[p].x = (GLfloat) (x - GRIDW / 2) / (GLfloat) (GRIDW / 2); - vertex[p].y = (GLfloat) (y - GRIDH / 2) / (GLfloat) (GRIDH / 2); - vertex[p].z = 0; - - if ((x % 4 < 2) ^ (y % 4 < 2)) - vertex[p].r = 0.0; - else - vertex[p].r = 1.0; - - vertex[p].g = (GLfloat) y / (GLfloat) GRIDH; - vertex[p].b = 1.f - ((GLfloat) x / (GLfloat) GRIDW + (GLfloat) y / (GLfloat) GRIDH) / 2.f; - } - } - - for (y = 0; y < QUADH; y++) - { - for (x = 0; x < QUADW; x++) - { - p = 4 * (y * QUADW + x); - - quad[p + 0] = y * GRIDW + x; // Some point - quad[p + 1] = y * GRIDW + x + 1; // Neighbor at the right side - quad[p + 2] = (y + 1) * GRIDW + x + 1; // Upper right neighbor - quad[p + 3] = (y + 1) * GRIDW + x; // Upper neighbor - } - } -} - -double dt; -double p[GRIDW][GRIDH]; -double vx[GRIDW][GRIDH], vy[GRIDW][GRIDH]; -double ax[GRIDW][GRIDH], ay[GRIDW][GRIDH]; - -//======================================================================== -// Initialize grid -//======================================================================== - -void init_grid(void) -{ - int x, y; - double dx, dy, d; - - for (y = 0; y < GRIDH; y++) - { - for (x = 0; x < GRIDW; x++) - { - dx = (double) (x - GRIDW / 2); - dy = (double) (y - GRIDH / 2); - d = sqrt(dx * dx + dy * dy); - if (d < 0.1 * (double) (GRIDW / 2)) - { - d = d * 10.0; - p[x][y] = -cos(d * (M_PI / (double)(GRIDW * 4))) * 100.0; - } - else - p[x][y] = 0.0; - - vx[x][y] = 0.0; - vy[x][y] = 0.0; - } - } -} - - -//======================================================================== -// Draw scene -//======================================================================== - -void draw_scene(GLFWwindow* window) -{ - // Clear the color and depth buffers - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); - - // We don't want to modify the projection matrix - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - - // Move back - glTranslatef(0.0, 0.0, -zoom); - // Rotate the view - glRotatef(beta, 1.0, 0.0, 0.0); - glRotatef(alpha, 0.0, 0.0, 1.0); - - glDrawElements(GL_QUADS, 4 * QUADNUM, GL_UNSIGNED_INT, quad); - - glfwSwapBuffers(window); -} - - -//======================================================================== -// Initialize Miscellaneous OpenGL state -//======================================================================== - -void init_opengl(void) -{ - // Use Gouraud (smooth) shading - glShadeModel(GL_SMOOTH); - - // Switch on the z-buffer - glEnable(GL_DEPTH_TEST); - - glEnableClientState(GL_VERTEX_ARRAY); - glEnableClientState(GL_COLOR_ARRAY); - glVertexPointer(3, GL_FLOAT, sizeof(struct Vertex), vertex); - glColorPointer(3, GL_FLOAT, sizeof(struct Vertex), &vertex[0].r); // Pointer to the first color - - glPointSize(2.0); - - // Background color is black - glClearColor(0, 0, 0, 0); -} - - -//======================================================================== -// Modify the height of each vertex according to the pressure -//======================================================================== - -void adjust_grid(void) -{ - int pos; - int x, y; - - for (y = 0; y < GRIDH; y++) - { - for (x = 0; x < GRIDW; x++) - { - pos = y * GRIDW + x; - vertex[pos].z = (float) (p[x][y] * (1.0 / 50.0)); - } - } -} - - -//======================================================================== -// Calculate wave propagation -//======================================================================== - -void calc_grid(void) -{ - int x, y, x2, y2; - double time_step = dt * ANIMATION_SPEED; - - // Compute accelerations - for (x = 0; x < GRIDW; x++) - { - x2 = (x + 1) % GRIDW; - for(y = 0; y < GRIDH; y++) - ax[x][y] = p[x][y] - p[x2][y]; - } - - for (y = 0; y < GRIDH; y++) - { - y2 = (y + 1) % GRIDH; - for(x = 0; x < GRIDW; x++) - ay[x][y] = p[x][y] - p[x][y2]; - } - - // Compute speeds - for (x = 0; x < GRIDW; x++) - { - for (y = 0; y < GRIDH; y++) - { - vx[x][y] = vx[x][y] + ax[x][y] * time_step; - vy[x][y] = vy[x][y] + ay[x][y] * time_step; - } - } - - // Compute pressure - for (x = 1; x < GRIDW; x++) - { - x2 = x - 1; - for (y = 1; y < GRIDH; y++) - { - y2 = y - 1; - p[x][y] = p[x][y] + (vx[x2][y] - vx[x][y] + vy[x][y2] - vy[x][y]) * time_step; - } - } -} - - -//======================================================================== -// Print errors -//======================================================================== - -static void error_callback(int error, const char* description) -{ - fprintf(stderr, "Error: %s\n", description); -} - - -//======================================================================== -// Handle key strokes -//======================================================================== - -void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) -{ - if (action != GLFW_PRESS) - return; - - switch (key) - { - case GLFW_KEY_ESCAPE: - glfwSetWindowShouldClose(window, GLFW_TRUE); - break; - case GLFW_KEY_SPACE: - init_grid(); - break; - case GLFW_KEY_LEFT: - alpha += 5; - break; - case GLFW_KEY_RIGHT: - alpha -= 5; - break; - case GLFW_KEY_UP: - beta -= 5; - break; - case GLFW_KEY_DOWN: - beta += 5; - break; - case GLFW_KEY_PAGE_UP: - zoom -= 0.25f; - if (zoom < 0.f) - zoom = 0.f; - break; - case GLFW_KEY_PAGE_DOWN: - zoom += 0.25f; - break; - default: - break; - } -} - - -//======================================================================== -// Callback function for mouse button events -//======================================================================== - -void mouse_button_callback(GLFWwindow* window, int button, int action, int mods) -{ - if (button != GLFW_MOUSE_BUTTON_LEFT) - return; - - if (action == GLFW_PRESS) - { - glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED); - glfwGetCursorPos(window, &cursorX, &cursorY); - } - else - glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL); -} - - -//======================================================================== -// Callback function for cursor motion events -//======================================================================== - -void cursor_position_callback(GLFWwindow* window, double x, double y) -{ - if (glfwGetInputMode(window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED) - { - alpha += (GLfloat) (x - cursorX) / 10.f; - beta += (GLfloat) (y - cursorY) / 10.f; - - cursorX = x; - cursorY = y; - } -} - - -//======================================================================== -// Callback function for scroll events -//======================================================================== - -void scroll_callback(GLFWwindow* window, double x, double y) -{ - zoom += (float) y / 4.f; - if (zoom < 0) - zoom = 0; -} - - -//======================================================================== -// Callback function for framebuffer resize events -//======================================================================== - -void framebuffer_size_callback(GLFWwindow* window, int width, int height) -{ - float ratio = 1.f; - mat4x4 projection; - - if (height > 0) - ratio = (float) width / (float) height; - - // Setup viewport - glViewport(0, 0, width, height); - - // Change to the projection matrix and set our viewing volume - glMatrixMode(GL_PROJECTION); - mat4x4_perspective(projection, - 60.f * (float) M_PI / 180.f, - ratio, - 1.f, 1024.f); - glLoadMatrixf((const GLfloat*) projection); -} - - -//======================================================================== -// main -//======================================================================== - -int main(int argc, char* argv[]) -{ - GLFWwindow* window; - double t, dt_total, t_old; - int width, height; - - glfwSetErrorCallback(error_callback); - - if (!glfwInit()) - exit(EXIT_FAILURE); - - window = glfwCreateWindow(640, 480, "Wave Simulation", NULL, NULL); - if (!window) - { - glfwTerminate(); - exit(EXIT_FAILURE); - } - - glfwSetKeyCallback(window, key_callback); - glfwSetFramebufferSizeCallback(window, framebuffer_size_callback); - glfwSetMouseButtonCallback(window, mouse_button_callback); - glfwSetCursorPosCallback(window, cursor_position_callback); - glfwSetScrollCallback(window, scroll_callback); - - glfwMakeContextCurrent(window); - gladLoadGL(glfwGetProcAddress); - glfwSwapInterval(1); - - glfwGetFramebufferSize(window, &width, &height); - framebuffer_size_callback(window, width, height); - - // Initialize OpenGL - init_opengl(); - - // Initialize simulation - init_vertices(); - init_grid(); - adjust_grid(); - - // Initialize timer - t_old = glfwGetTime() - 0.01; - - while (!glfwWindowShouldClose(window)) - { - t = glfwGetTime(); - dt_total = t - t_old; - t_old = t; - - // Safety - iterate if dt_total is too large - while (dt_total > 0.f) - { - // Select iteration time step - dt = dt_total > MAX_DELTA_T ? MAX_DELTA_T : dt_total; - dt_total -= dt; - - // Calculate wave propagation - calc_grid(); - } - - // Compute height of each vertex - adjust_grid(); - - // Draw wave grid to OpenGL display - draw_scene(window); - - glfwPollEvents(); - } - - glfwTerminate(); - exit(EXIT_SUCCESS); -} - |