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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
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518
examples/wave.c
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@ -22,27 +22,26 @@
/* Animation speed (10.0 looks good) */ /* Animation speed (10.0 looks good) */
#define ANIMATION_SPEED 10.0 #define ANIMATION_SPEED 10.0
GLfloat alpha = 210.f, beta = -70.f;
GLfloat zoom = 2.f;
GLfloat alpha = 210.0f, beta = -70.0f; GLboolean running = GL_TRUE;
GLfloat zoom = 2.0f;
int running = 1;
struct Vertex struct Vertex
{ {
GLfloat x,y,z; GLfloat x, y, z;
GLfloat r,g,b; GLfloat r, g, b;
}; };
#define GRIDW 50 #define GRIDW 50
#define GRIDH 50 #define GRIDH 50
#define VERTEXNUM (GRIDW*GRIDH) #define VERTEXNUM (GRIDW*GRIDH)
#define QUADW (GRIDW-1) #define QUADW (GRIDW - 1)
#define QUADH (GRIDH-1) #define QUADH (GRIDH - 1)
#define QUADNUM (QUADW*QUADH) #define QUADNUM (QUADW*QUADH)
GLuint quad[4*QUADNUM]; GLuint quad[4 * QUADNUM];
struct Vertex vertex[VERTEXNUM]; struct Vertex vertex[VERTEXNUM];
/* The grid will look like this: /* The grid will look like this:
@ -56,47 +55,47 @@ struct Vertex vertex[VERTEXNUM];
* 0 1 2 * 0 1 2
*/ */
void initVertices( void ) //========================================================================
// Initialize grid geometry
//========================================================================
void init_vertices(void)
{ {
int x,y,p; int x, y, p;
/* place the vertices in a grid */ // Place the vertices in a grid
for(y=0;y<GRIDH;y++) for (y = 0; y < GRIDH; y++)
for(x=0;x<GRIDW;x++)
{ {
p = y*GRIDW + x; 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].x = (GLfloat) (x - GRIDW / 2) / (GLfloat) (GRIDW / 2);
//vertex[p].y = (-GRIDH/2)+y+cos(2.0*M_PI*(double)x/(double)GRIDW); vertex[p].y = (GLfloat) (y - GRIDH / 2) / (GLfloat) (GRIDH / 2);
vertex[p].x = (GLfloat)(x-GRIDW/2)/(GLfloat)(GRIDW/2); vertex[p].z = 0;
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;
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; if ((x % 4 < 2) ^ (y % 4 < 2))
vertex[p].b = 1.f-((GLfloat)x/(GLfloat)GRIDW+(GLfloat)y/(GLfloat)GRIDH)/2.f; 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 (y = 0; y < QUADH; y++)
for(x=0;x<QUADW;x++)
{ {
p = 4*(y*QUADW + x); for (x = 0; x < QUADW; x++)
{
p = 4 * (y * QUADW + x);
/* first quad */ /* first quad */
quad[p+0] = y *GRIDW+x; /* some point */ quad[p + 0] = y * GRIDW + x; // Some point
quad[p+1] = y *GRIDW+x+1; /* neighbor at the right side */ 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 + 2] = (y + 1) * GRIDW + x + 1; // Upper right neighbor
quad[p+3] = (y+1)*GRIDW+x; /* upper neighbor */ quad[p + 3] = (y + 1) * GRIDW + x; // Upper neighbor
}
} }
} }
@ -105,298 +104,287 @@ double p[GRIDW][GRIDH];
double vx[GRIDW][GRIDH], vy[GRIDW][GRIDH]; double vx[GRIDW][GRIDH], vy[GRIDW][GRIDH];
double ax[GRIDW][GRIDH], ay[GRIDW][GRIDH]; double ax[GRIDW][GRIDH], ay[GRIDW][GRIDH];
//========================================================================
// Initialize grid
//========================================================================
void init_grid(void)
void initSurface( void )
{ {
int x, y; int x, y;
double dx, dy, d; double dx, dy, d;
for(y = 0; y<GRIDH; y++) for (y = 0; y < GRIDH; y++)
{
for(x = 0; x<GRIDW; x++)
{ {
dx = (double)(x-GRIDW/2); for (x = 0; x < GRIDW; x++)
dy = (double)(y-GRIDH/2); {
d = sqrt( dx*dx + dy*dy ); dx = (double) (x - GRIDW / 2);
if(d < 0.1 * (double)(GRIDW/2)) dy = (double) (y - GRIDH / 2);
{ d = sqrt(dx * dx + dy * dy);
d = d * 10.0; if (d < 0.1 * (double) (GRIDW / 2))
p[x][y] = -cos(d * (M_PI / (double)(GRIDW * 4))) * 100.0; {
} d = d * 10.0;
else p[x][y] = -cos(d * (M_PI / (double)(GRIDW * 4))) * 100.0;
{ }
p[x][y] = 0.0; else
} p[x][y] = 0.0;
vx[x][y] = 0.0;
vy[x][y] = 0.0; vx[x][y] = 0.0;
vy[x][y] = 0.0;
}
} }
}
} }
/* 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); 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); glMatrixMode(GL_MODELVIEW);
glLoadIdentity(); glLoadIdentity();
/* Move back. */ // Move back
glTranslatef(0.0, 0.0, -zoom); glTranslatef(0.0, 0.0, -zoom);
/* Rotate the view */ // Rotate the view
glRotatef(beta, 1.0, 0.0, 0.0); glRotatef(beta, 1.0, 0.0, 0.0);
glRotatef(alpha, 0.0, 0.0, 1.0); 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_QUADS, 4*QUADNUM, GL_UNSIGNED_INT, quad);
//glDrawElements(GL_LINES, QUADNUM, GL_UNSIGNED_INT, quad);
glfwSwapBuffers(); 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); glShadeModel(GL_SMOOTH);
/* Culling. */ // Switch on the z-buffer
//glCullFace(GL_BACK); glEnable(GL_DEPTH_TEST);
//glFrontFace(GL_CCW);
//glEnable(GL_CULL_FACE);
/* Switch on the z-buffer. */ glEnableClientState(GL_VERTEX_ARRAY);
glEnable(GL_DEPTH_TEST); 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
glEnableClientState(GL_VERTEX_ARRAY); glPointSize(2.0);
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
glPointSize(2.0);
/* Background color is black. */ // Background color is black
glClearColor(0, 0, 0, 0); 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
{ //========================================================================
int pos;
int x, y;
for(y = 0; y<GRIDH; y++) void adjust_grid(void)
{ {
for(x = 0; x<GRIDW; x++) int pos;
int x, y;
for (y = 0; y < GRIDH; y++)
{ {
pos = y*GRIDW + x; for (x = 0; x < GRIDW; x++)
vertex[pos].z = (float) (p[x][y]*(1.0/50.0)); {
pos = y * GRIDW + x;
vertex[pos].z = (float) (p[x][y] * (1.0 / 50.0));
}
} }
}
} }
/* Calculate wave propagation */ //========================================================================
void calc( void ) // Calculate wave propagation
//========================================================================
void calc_grid(void)
{ {
int x, y, x2, y2; int x, y, x2, y2;
double time_step = dt * ANIMATION_SPEED; double time_step = dt * ANIMATION_SPEED;
/* compute accelerations */ // Compute accelerations
for(x = 0; x < GRIDW; x++) 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]; 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++) 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]; 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 (x = 0; x < GRIDW; x++)
{
for(y = 0; y < GRIDH; y++)
{ {
vx[x][y] = vx[x][y] + ax[x][y] * time_step; for (y = 0; y < GRIDH; y++)
vy[x][y] = vy[x][y] + ay[x][y] * time_step; {
vx[x][y] = vx[x][y] + ax[x][y] * time_step;
vy[x][y] = vy[x][y] + ay[x][y] * time_step;
}
} }
}
/* compute pressure */ // Compute pressure
for(x = 1; x < GRIDW; x++) for (x = 1; x < GRIDW; x++)
{
x2 = x - 1;
for(y = 1; y < GRIDH; y++)
{ {
y2 = y - 1; x2 = x - 1;
p[x][y] = p[x][y] + (vx[x2][y] - vx[x][y] + vy[x][y2] - vy[x][y]) * time_step; 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;
}
} }
}
} }
/* Handle key strokes */ //========================================================================
// Handle key strokes
//========================================================================
void handle_key_down(GLFWwindow window, int key, int action) void handle_key_down(GLFWwindow window, int key, int action)
{ {
if( action != GLFW_PRESS ) if (action != GLFW_PRESS)
{ return;
return;
}
switch(key) { switch (key)
case GLFW_KEY_ESC: {
running = 0; case GLFW_KEY_ESC:
break; running = 0;
case GLFW_KEY_SPACE: break;
initSurface(); case GLFW_KEY_SPACE:
break; init_grid();
case GLFW_KEY_LEFT: break;
alpha+=5; case GLFW_KEY_LEFT:
break; alpha += 5;
case GLFW_KEY_RIGHT: break;
alpha-=5; case GLFW_KEY_RIGHT:
break; alpha -= 5;
case GLFW_KEY_UP: break;
beta-=5; case GLFW_KEY_UP:
break; beta -= 5;
case GLFW_KEY_DOWN: break;
beta+=5; case GLFW_KEY_DOWN:
break; beta += 5;
case GLFW_KEY_PAGEUP: break;
if(zoom>1) zoom-=1; case GLFW_KEY_PAGEUP:
break; if (zoom > 1)
case GLFW_KEY_PAGEDOWN: zoom -= 1;
zoom+=1; break;
break; case GLFW_KEY_PAGEDOWN:
default: zoom+=1;
break; break;
} default:
break;
}
} }
/* Callback function for window resize events */ //========================================================================
void handle_resize( GLFWwindow window, int width, int height ) // 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 ) if (height > 0)
{ ratio = (float) width / (float) height;
ratio = (float) width / (float) height;
}
/* Setup viewport (Place where the stuff will appear in the main window). */ // Setup viewport
glViewport(0, 0, width, height); glViewport(0, 0, width, height);
/* // Change to the projection matrix and set our viewing volume
* Change to the projection matrix and set glMatrixMode(GL_PROJECTION);
* our viewing volume. glLoadIdentity();
*/ gluPerspective(60.0, ratio, 1.0, 1024.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, ratio, 1.0, 1024.0);
} }
/* Program entry point */ //========================================================================
// main
//========================================================================
int main(int argc, char* argv[]) int main(int argc, char* argv[])
{ {
/* Dimensions of our window. */ GLFWwindow window;
int width, height; double t, dt_total, t_old;
/* Style of our window. */
int mode;
/* Frame time */
double t, t_old, dt_total;
GLFWwindow window;
/* Initialize GLFW */ if (!glfwInit())
if(glfwInit() == GL_FALSE)
{
fprintf(stderr, "GLFW initialization failed\n");
exit(-1);
}
/* 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);
if (!window)
{
fprintf(stderr, "Could not open window\n");
glfwTerminate();
exit(-1);
}
glfwSwapInterval( 1 );
/* Keyboard handler */
glfwSetKeyCallback( window, handle_key_down );
glfwEnable( window, GLFW_KEY_REPEAT );
/* Window resize handler */
glfwSetWindowSizeCallback( window, handle_resize );
/* Initialize OpenGL */
setup_opengl();
/* Initialize simulation */
initVertices();
initSurface();
adjustGrid();
/* 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 )
{ {
/* Select iteration time step */ fprintf(stderr, "GLFW initialization failed\n");
dt = dt_total > MAX_DELTA_T ? MAX_DELTA_T : dt_total; exit(EXIT_FAILURE);
dt_total -= dt;
/* Calculate wave propagation */
calc();
} }
/* Compute height of each vertex */ window = glfwOpenWindow(640, 480, GLFW_WINDOWED, "Wave Simulation", NULL);
adjustGrid(); if (!window)
{
fprintf(stderr, "Could not open window\n");
exit(EXIT_FAILURE);
}
/* Draw wave grid to OpenGL display */ glfwSwapInterval(1);
draw_screen();
glfwPollEvents(); // Keyboard handler
glfwSetKeyCallback(window, handle_key_down);
glfwEnable(window, GLFW_KEY_REPEAT);
/* Still running? */ // Window resize handler
running = running && glfwIsWindow( window ); glfwSetWindowSizeCallback(window, handle_resize);
}
glfwTerminate(); // Initialize OpenGL
init_opengl();
return 0; // Initialize simulation
init_vertices();
init_grid();
adjust_grid();
// Initialize timer
t_old = glfwGetTime() - 0.01;
while (running)
{
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();
glfwPollEvents();
// Still running?
running = running && glfwIsWindow(window);
}
exit(EXIT_SUCCESS);
} }