texpage.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:12k
- #include <stdlib.h>
- #include <stdio.h>
- #include <math.h>
- #include <GL/glut.h>
- #include "texture.h"
- #include <string.h>
- #if !defined(GL_VERSION_1_1) && !defined(GL_VERSION_1_2)
- #define glTexSubImage2D glTexSubImage2DEXT
- #endif
- static unsigned *image, *bgdtile;
- static int width, height, components;
- static int grid, zoom, texture;
- #define TSIZE 128
- #define TILES 16
- #define TILESIZE 32
- static struct tile {
- void *data;
- } tiles[TILES][TILES];
- static int x = TILES*TILESIZE/2, y = TILES*TILESIZE/2;
- /*
- * make an rgb tile for the background.
- */
- static void
- background_tile(void) {
- int i,j,grid;
- unsigned char *ptr;
- bgdtile = (unsigned *) malloc(TILESIZE*TILESIZE*sizeof(unsigned));
- grid = 8;
- ptr = (unsigned char *) bgdtile;
- for (i=0; i<TILESIZE; i++) {
- for(j=0; j<TILESIZE; j++) {
- if(i%grid == 0 || j%grid == 0) {
- *ptr++ = 0x0; *ptr++ = 0x0; *ptr++ = 0x40; ptr++;
- } else {
- *ptr++ = 0x40; *ptr++ = 0x40; *ptr++ = 0x40; ptr++;
- }
- }
- }
- }
- static void
- tile_image(unsigned *image) {
- int i, j;
- int w = width/TILESIZE;
- int h = height/TILESIZE, w2 = w/2, h2 = h/2;
- background_tile();
- for(i = 0; i < TILES; i++) {
- for(j = 0; j < TILES; j++) {
- if (i >= TILES/2-w2 && i < TILES/2-w2+w && j >= TILES/2-h2 && j < TILES/2-h2+h) {
- /* interior */
- int x, y, k;
- tiles[j][i].data = malloc(TILESIZE*TILESIZE*sizeof(*image));
- x = TILESIZE*(i-TILES/2+w2);
- y = TILESIZE*(j-TILES/2+h2);
- for(k = 0; k < TILESIZE; k++)
- memcpy((unsigned *)tiles[j][i].data+k*TILESIZE,
- image+width*(y+k)+x, TILESIZE*sizeof *image);
- }
- else
- tiles[j][i].data = bgdtile;
- }
- }
- for(i = 0; i < TILES; i++) {
- for(j = 0; j < TILES; j++) {
- printf("%d ", tiles[j][i].data != bgdtile);
- }
- printf("n");
- }
- }
- #define MAXMESH 64
- static float Ml[4*2*(MAXMESH+1)*2 * (MAXMESH+1)];
- static void
- mesh0(float x0, float x1, float y0, float y1,
- float s0, float s1, float t0, float t1, float z, int nx,int ny)
- {
- float y,x,s,t,dx,dy,ds,dt,vb[3],tb[2];
- float *mp = Ml;
-
- dx = (x1-x0)/nx;
- dy = (y1-y0)/ny;
- ds = (s1-s0)/nx;
- dt = (t1-t0)/ny;
- y = y0;
- t = t0;
- vb[2] = z;
- while (y < y1) {
- x = x0;
- s = s0;
- while(x <= x1) {
- tb[0] = s; tb[1] = t;
- vb[0] = x; vb[1] = y;
- vb[2] = 0.0;
- *mp++ = tb[0];
- *mp++ = tb[1];
- mp += 2;
- *mp++ = vb[0];
- *mp++ = vb[1];
- *mp++ = vb[2];
- mp++;
- tb[1] = t+dt;
- vb[1] = y+dy;
- vb[2] = 0.0;
- *mp++ = tb[0];
- *mp++ = tb[1];
- mp += 2;
- *mp++ = vb[0];
- *mp++ = vb[1];
- *mp++ = vb[2];
- mp++;
- x += dx;
- s += ds;
- }
- y += dy;
- t += dt;
- }
- }
- static void
- drawmesh(int nx,int ny) {
- float *mp = Ml;
- int i,j;
- glPushMatrix();
- if (zoom) glScalef(1.5f, 1.5f, 1.f);
- glColor4f(1,1,1,1);
- for (i = ny+1; i; i--) {
- glBegin(GL_TRIANGLE_STRIP);
- for (j = nx+1; j; j--) {
- glTexCoord2fv(mp);
- glVertex3fv(mp+4);
- glTexCoord2fv(mp+8);
- glVertex3fv(mp+12); mp += 16;
- }
- glEnd();
- }
- glPopMatrix();
- }
- static void
- help(void) {
- printf("'h' - helpn");
- printf("'left' - pan leftn");
- printf("'right' - pan rightn");
- printf("'up' - pan upn");
- printf("'down' - pan downn");
- printf("'t' - toggle texture memory displayn");
- printf("'g' - toggle gridn");
- printf("'x' - toggle auto pann");
- printf("'z' - toggle zoomn");
- }
- static void
- gfunc(void) {
- grid ^= 1;
- }
- static void
- tfunc(void) {
- texture ^= 1;
- }
- static void anim(void);
- static void
- xfunc(void) {
- static int state;
- glutIdleFunc((state ^= 1) ? anim : NULL);
- }
- static void
- zfunc(void) {
- zoom ^= 1;
- }
- #define CLAMP(v) { int w = TSIZE/2;
- if (v < w) v = w;
- else if (v > TILES*TILESIZE-w) v = TILES*TILESIZE-w; }
- static void
- up(void) {
- y += 8;
- CLAMP(y);
- }
- static void
- pfunc(void) {
- static int delta = -1;
- int xx = x + delta;
- x += delta; CLAMP(x);
- y += delta; CLAMP(y);
- if (x != xx) delta = -delta;
- }
- static void
- down(void) {
- y -= 8;
- CLAMP(y);
- }
- static void
- right(void) {
- x += 8;
- CLAMP(x);
- }
- static void
- left(void) {
- x -= 8;
- CLAMP(x);
- }
- static void
- anim(void) {
- static int delta = -1;
- int xx = x + delta;
- x += delta;
- CLAMP(x);
- y += delta;
- CLAMP(y);
- if (x != xx) delta = -delta;
- glutPostRedisplay();
- }
- static void
- loadtiles(void) {
- int lx, rx, ty, by; /* image bounding box */
- static int ox = TILES*TILESIZE/2, oy = TILES*TILESIZE/2; /* image origin */
- static int ot = 0, os = 0;
- int dx = 0, dy = 0, nx = -1, ny = -1;
- float trx, try;
- #define S_TSIZE (TSIZE-TILESIZE) /* visible portion of texture = TSIZE less one tile for slop */
- /* calculate tile #'s at corners of visible region */
- lx = x - S_TSIZE/2;
- rx = lx + S_TSIZE;
- by = y - S_TSIZE/2;
- ty = by + S_TSIZE;
- lx /= TILESIZE; rx /= TILESIZE;
- by /= TILESIZE; ty /= TILESIZE;
- dx = ((x - S_TSIZE/2)/TILESIZE) - ((ox - S_TSIZE/2)/TILESIZE);
-
- nx = lx; ny = by;
- if (dx < 0) {
- /* add on left */
- os -= TILESIZE;
- if (os < 0) os += TSIZE;
- nx = lx;
- } else if (dx > 0) {
- nx = rx;
- }
- dy = ((y - S_TSIZE/2) / TILESIZE) - ((oy - S_TSIZE/2) / TILESIZE);
- if (dy > 0) {
- /* add on bottom */
- ny = ty;
- } else if (dy < 0) {
- /* add on top */
- ot -= TILESIZE;
- if (ot < 0) ot += TSIZE;
- ny = by;
- }
- if (dx || dy) printf("dx %d dy %d lx %d rx %d by %d ty %d nx %d ny %d os %d ot %dn", dx, dy, lx, rx, by, ty, nx, ny, os, ot);
- if (dx) {
- int t;
- for(t = 0; t < TSIZE; t += TILESIZE) {
- glTexSubImage2D(GL_TEXTURE_2D, 0, os, (t+ot) % TSIZE, TILESIZE,
- TILESIZE, GL_RGBA, GL_UNSIGNED_BYTE,
- tiles[ny+t/TILESIZE][nx].data);
- printf("load %d %d %d %dn", nx, ny+t/TILESIZE, os, (t+ot) % TSIZE);
- }
- }
- if (dy) {
- int s;
- for(s = 0; s < TSIZE; s += TILESIZE) {
- glTexSubImage2D(GL_TEXTURE_2D, 0, (s+os) % TSIZE, ot, TILESIZE,
- TILESIZE, GL_RGBA, GL_UNSIGNED_BYTE,
- tiles[ny][nx+s/TILESIZE].data);
- printf("load %d %d %d %dn", nx+s/TILESIZE, ny, (s+os) % TSIZE, ot);
- }
- }
- if (dx > 0) {
- os += TILESIZE;
- if (os >= TSIZE) os -= TSIZE;
- }
- if (dy > 0) {
- ot += TILESIZE;
- if (ot >= TSIZE) ot -= TSIZE;
- }
- ox = x; oy = y;
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- trx = (float)((x-TILES*TILESIZE/2) % TSIZE)/TSIZE;
- try = (float)((y-TILES*TILESIZE/2) % TSIZE)/TSIZE;
- glTranslatef(trx, try, 0.f);
- glMatrixMode(GL_MODELVIEW);
- }
- static void
- init(char *filename) {
- int i;
- mesh0(-1.f,1.f,-1.f,1.f,0.f,1.f,0.f,1.f,0.f,64,64);
- if (filename) {
- image = read_texture(filename, &width, &height, &components);
- if (image == NULL) {
- fprintf(stderr, "Error: Can't load image file "%s".n",
- filename);
- exit(EXIT_FAILURE);
- } else {
- printf("%d x %d image loadedn", width, height);
- }
- if (components < 3 || components > 4) {
- printf("must be RGB or RGBA imagen");
- exit(EXIT_FAILURE);
- }
- } else {
- int i, j;
- components = 4; width = height = TSIZE;
- image = (unsigned *) malloc(width*height*sizeof(unsigned));
- for (j = 0; j < height; j++)
- for (i = 0; i < width; i++) {
- if (i & 1)
- image[i+j*width] = 0xff;
- else
- image[i+j*width] = 0xff00;
- if (j&1)
- image[i+j*width] |= 0xff0000;
- }
- }
- if (width % TILESIZE || height % TILESIZE) {
- #define TXSIZE 192
- unsigned *newimage = malloc(TXSIZE*TXSIZE*sizeof *newimage);
- gluScaleImage(GL_RGBA, width, height, GL_UNSIGNED_BYTE, image,
- TXSIZE, TXSIZE, GL_UNSIGNED_BYTE, newimage);
- free(image);
- image = newimage; width = height = TXSIZE; components = 4;
- }
- tile_image(image);
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TSIZE,
- TSIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- for(i = 0; i < TILES; i++) {
- int j;
- for(j = 0; j < TILES; j++) {
- glTexSubImage2D(GL_TEXTURE_2D, 0, i*TILESIZE, j*TILESIZE, TILESIZE,
- TILESIZE, GL_RGBA, GL_UNSIGNED_BYTE,
- tiles[(TILES-TSIZE/TILESIZE)/2+j][(TILES-TSIZE/TILESIZE)/2+i].data);
- }
- }
- glEnable(GL_TEXTURE_2D);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(90.,1.,.1,10.);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.,0.,-1.0);
- glLineWidth(3.0);
- glClearColor(.25, .25, .25, .25);
- /* start at center of image */
- x = TILES*TILESIZE/2;
- y = TILES*TILESIZE/2;
- }
- void
- showgrid(void) {
- GLfloat mat[16];
- int i;
- glPushMatrix();
- glDisable(GL_TEXTURE_2D);
- glPushMatrix();
- glColor3f(0.f, 0.f, 0.f);
- if (!zoom) glScalef(1.f/1.5f, 1.f/1.5f, 1.f);
- glBegin(GL_LINE_LOOP);
- glVertex2f(-1.f,-1.f);
- glVertex2f(-1.f, 1.f);
- glVertex2f( 1.f, 1.f);
- glVertex2f( 1.f,-1.f);
- glEnd();
- glPopMatrix();
- glGetFloatv(GL_TEXTURE_MATRIX,mat);
- glPushMatrix();
- if (zoom) glScalef(1.5f,1.5f,1.f);
- glTranslatef(-1.f,-1.f,-1.f);
- glScalef(2.f,2.f,1.f);
- glTranslatef(-mat[12], -mat[13], 1.0f);
- #if 1
- glColor3f(1.f,1.f,1.f);
- #else
- glColor3f(1.f,0.f,0.f);
- #endif
- glBegin(GL_LINES);
- for(i = -TSIZE; i <= 2*TSIZE; i+=TILESIZE) {
- GLfloat x = (GLfloat)i/(GLfloat)TSIZE;
- glVertex2f(-1.f,x);
- glVertex2f(2.f,x);
- glVertex2f(x,-1.f);
- glVertex2f(x,2.f);
- }
- glEnd();
- glPopMatrix();
- glEnable(GL_TEXTURE_2D);
- glPopMatrix();
- }
- static void
- drawtexture(void) {
- glMatrixMode(GL_TEXTURE);
- glPushMatrix();
- glLoadIdentity();
- glColor3f(1.f,1.f,1.f);
- glBegin(GL_QUADS);
- glTexCoord2f(0.f, 0.f); glVertex2f(-1.f, -1.f);
- glTexCoord2f(0.f, 1.f); glVertex2f(-1.f, 1.f);
- glTexCoord2f(1.f, 1.f); glVertex2f( 1.f, 1.f);
- glTexCoord2f(1.f, 0.f); glVertex2f( 1.f, -1.f);
- glEnd();
- glPopMatrix();
- glMatrixMode(GL_MODELVIEW);
- }
- static void
- display(void) {
- glClear(GL_COLOR_BUFFER_BIT);
- loadtiles();
- if (texture) {
- drawtexture();
- } else {
- drawmesh(64,64);
- if (grid) showgrid();
- }
- glutSwapBuffers();
- }
- static void
- reshape(int w, int h) {
- glViewport(0, 0, w, h);
- }
- /*ARGSUSED1*/
- static void
- key(unsigned char key, int x, int y) {
- switch(key) {
- case 'h': help(); break;
- case 'g': gfunc(); break;
- case 't': tfunc(); break;
- case 'z': zfunc(); break;
- case 'x': xfunc(); break;
- case 'p': pfunc(); break;
- case ' 33': exit(EXIT_SUCCESS); break;
- default: break;
- }
- glutPostRedisplay();
- }
- /*ARGSUSED1*/
- static void
- special(int key, int x, int y) {
- switch(key) {
- case GLUT_KEY_UP: up(); break;
- case GLUT_KEY_DOWN: down(); break;
- case GLUT_KEY_LEFT: left(); break;
- case GLUT_KEY_RIGHT:right(); break;
- }
- glutPostRedisplay();
- }
- int main(int argc, char* argv[]) {
- glutInitWindowSize(512, 512);
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
- (void)glutCreateWindow(argv[0]);
- init(argv[1] ? argv[1] : "../data/fendi.rgb");
- glutDisplayFunc(display);
- glutKeyboardFunc(key);
- glutSpecialFunc(special);
- glutReshapeFunc(reshape);
- glutMainLoop();
- return 0;
- }