Navy.gif/glfw
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Formatting.

Browse Source
This commit is contained in:
Camilla Berglund 2010-10-24 15:37:51 +02:00
parent 9c27d52b2e
commit b9f318f053
1 changed files with 253 additions and 265 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

218
examples/wave.c
View File

@ -22,11 +22,10 @@
/* Animation speed (10.0 looks good) */
#define ANIMATION_SPEED 10.0
GLfloat alpha = 210.f, beta = -70.f;
GLfloat zoom = 2.f;
GLfloat alpha = 210.0f, beta = -70.0f;
GLfloat zoom = 2.0f;
int running = 1;
GLboolean running = GL_TRUE;
struct Vertex
{
@ -56,47 +55,47 @@ struct Vertex vertex[VERTEXNUM];
* 0 1 2
*/
void initVertices( void )
//========================================================================
// Initialize grid geometry
//========================================================================
void init_vertices(void)
{
int x, y, p;
/* place the vertices in a grid */
// 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 = (-GRIDW/2)+x+sin(2.0*M_PI*(double)y/(double)GRIDH);
//vertex[p].y = (-GRIDH/2)+y+cos(2.0*M_PI*(double)x/(double)GRIDW);
vertex[p].x = (GLfloat) (x - GRIDW / 2) / (GLfloat) (GRIDW / 2);
vertex[p].y = (GLfloat) (y - GRIDH / 2) / (GLfloat) (GRIDH / 2);
vertex[p].z = 0;//sin(d*M_PI);
//vertex[p].r = (GLfloat)x/(GLfloat)GRIDW;
//vertex[p].g = (GLfloat)y/(GLfloat)GRIDH;
//vertex[p].b = 1.0-((GLfloat)x/(GLfloat)GRIDW+(GLfloat)y/(GLfloat)GRIDH)/2.0;
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);
/* first quad */
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 */
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
}
}
}
@ -105,9 +104,11 @@ double p[GRIDW][GRIDH];
double vx[GRIDW][GRIDH], vy[GRIDW][GRIDH];
double ax[GRIDW][GRIDH], ay[GRIDW][GRIDH];
//========================================================================
// Initialize grid
//========================================================================
void initSurface( void )
void init_grid(void)
{
int x, y;
double dx, dy, d;
@ -125,9 +126,8 @@ void initSurface( void )
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;
}
@ -135,57 +135,60 @@ void initSurface( void )
}
/* Draw view */
void draw_screen( void )
//========================================================================
// Draw scene
//========================================================================
void draw_scene(void)
{
/* Clear the color and depth buffers. */
// Clear the color and depth buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* We don't want to modify the projection matrix. */
// We don't want to modify the projection matrix
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* Move back. */
// Move back
glTranslatef(0.0, 0.0, -zoom);
/* Rotate the view */
// Rotate the view
glRotatef(beta, 1.0, 0.0, 0.0);
glRotatef(alpha, 0.0, 0.0, 1.0);
//glDrawArrays(GL_POINTS,0,VERTEXNUM); /* Points only */
glDrawElements(GL_QUADS, 4 * QUADNUM, GL_UNSIGNED_INT, quad);
//glDrawElements(GL_LINES, QUADNUM, GL_UNSIGNED_INT, quad);
glfwSwapBuffers();
}
/* Initialize OpenGL */
void setup_opengl( void )
//========================================================================
// Initialize Miscellaneous OpenGL state
//========================================================================
void init_opengl(void)
{
/* Our shading model--Gouraud (smooth). */
// Use Gouraud (smooth) shading
glShadeModel(GL_SMOOTH);
/* Culling. */
//glCullFace(GL_BACK);
//glFrontFace(GL_CCW);
//glEnable(GL_CULL_FACE);
/* Switch on the z-buffer. */
// Switch on the z-buffer
glEnable(GL_DEPTH_TEST);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3/*3 components per vertex (x,y,z)*/, GL_FLOAT, sizeof(struct Vertex), vertex);
glColorPointer(3/*3 components per vertex (r,g,b)*/, GL_FLOAT, sizeof(struct Vertex), &vertex[0].r); //Pointer to the first color
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. */
// Background color is black
glClearColor(0, 0, 0, 0);
}
/* Modify the height of each vertex according to the pressure. */
void adjustGrid( void )
//========================================================================
// Modify the height of each vertex according to the pressure
//========================================================================
void adjust_grid(void)
{
int pos;
int x, y;
@ -201,32 +204,31 @@ void adjustGrid( void )
}
/* Calculate wave propagation */
void calc( void )
//========================================================================
// Calculate wave propagation
//========================================================================
void calc_grid(void)
{
int x, y, x2, y2;
double time_step = dt * ANIMATION_SPEED;
/* compute accelerations */
// 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 */
// Compute speeds
for (x = 0; x < GRIDW; x++)
{
for (y = 0; y < GRIDH; y++)
@ -236,7 +238,7 @@ void calc( void )
}
}
/* compute pressure */
// Compute pressure
for (x = 1; x < GRIDW; x++)
{
x2 = x - 1;
@ -249,20 +251,22 @@ void calc( void )
}
/* Handle key strokes */
//========================================================================
// Handle key strokes
//========================================================================
void handle_key_down(GLFWwindow window, int key, int action)
{
if (action != GLFW_PRESS)
{
return;
}
switch(key) {
switch (key)
{
case GLFW_KEY_ESC:
running = 0;
break;
case GLFW_KEY_SPACE:
initSurface();
init_grid();
break;
case GLFW_KEY_LEFT:
alpha += 5;
@ -277,7 +281,8 @@ void handle_key_down(GLFWwindow window, int key, int action)
beta += 5;
break;
case GLFW_KEY_PAGEUP:
if(zoom>1) zoom-=1;
if (zoom > 1)
zoom -= 1;
break;
case GLFW_KEY_PAGEDOWN:
zoom+=1;
@ -288,115 +293,98 @@ void handle_key_down(GLFWwindow window, int key, int action)
}
/* Callback function for window resize events */
//========================================================================
// Callback function for window resize events
//========================================================================
void handle_resize(GLFWwindow window, int width, int height)
{
float ratio = 1.0f;
float ratio = 1.f;
if (height > 0)
{
ratio = (float) width / (float) height;
}
/* Setup viewport (Place where the stuff will appear in the main window). */
// Setup viewport
glViewport(0, 0, width, height);
/*
* Change to the projection matrix and set
* our viewing volume.
*/
// Change to the projection matrix and set our viewing volume
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, ratio, 1.0, 1024.0);
}
/* Program entry point */
//========================================================================
// main
//========================================================================
int main(int argc, char* argv[])
{
/* Dimensions of our window. */
int width, height;
/* Style of our window. */
int mode;
/* Frame time */
double t, t_old, dt_total;
GLFWwindow window;
double t, dt_total, t_old;
/* Initialize GLFW */
if(glfwInit() == GL_FALSE)
if (!glfwInit())
{
fprintf(stderr, "GLFW initialization failed\n");
exit(-1);
exit(EXIT_FAILURE);
}
/* Desired window properties */
width = 640;
height = 480;
mode = GLFW_WINDOWED;
glfwOpenWindowHint(GLFW_DEPTH_BITS, 16);
/* Open window */
window = glfwOpenWindow(width, height, mode, "Wave Simulation", NULL);
window = glfwOpenWindow(640, 480, GLFW_WINDOWED, "Wave Simulation", NULL);
if (!window)
{
fprintf(stderr, "Could not open window\n");
glfwTerminate();
exit(-1);
exit(EXIT_FAILURE);
}
glfwSwapInterval(1);
/* Keyboard handler */
// Keyboard handler
glfwSetKeyCallback(window, handle_key_down);
glfwEnable(window, GLFW_KEY_REPEAT);
/* Window resize handler */
// Window resize handler
glfwSetWindowSizeCallback(window, handle_resize);
/* Initialize OpenGL */
setup_opengl();
// Initialize OpenGL
init_opengl();
/* Initialize simulation */
initVertices();
initSurface();
adjustGrid();
// Initialize simulation
init_vertices();
init_grid();
adjust_grid();
/* Initialize timer */
// Initialize timer
t_old = glfwGetTime() - 0.01;
/* Main loop */
while (running)
{
/* Timing */
t = glfwGetTime();
dt_total = t - t_old;
t_old = t;
/* Safety - iterate if dt_total is too large */
while( dt_total > 0.0f )
// Safety - iterate if dt_total is too large
while (dt_total > 0.f)
{
/* Select iteration time step */
// Select iteration time step
dt = dt_total > MAX_DELTA_T ? MAX_DELTA_T : dt_total;
dt_total -= dt;
/* Calculate wave propagation */
calc();
// Calculate wave propagation
calc_grid();
}
/* Compute height of each vertex */
adjustGrid();
// Compute height of each vertex
adjust_grid();
/* Draw wave grid to OpenGL display */
draw_screen();
// Draw wave grid to OpenGL display
draw_scene();
glfwPollEvents();
/* Still running? */
// Still running?
running = running && glfwIsWindow(window);
}
glfwTerminate();
return 0;
exit(EXIT_SUCCESS);
}