diff options
Diffstat (limited to 'progs/demos/fbo_firecube.c')
| -rw-r--r-- | progs/demos/fbo_firecube.c | 1071 |
1 files changed, 0 insertions, 1071 deletions
diff --git a/progs/demos/fbo_firecube.c b/progs/demos/fbo_firecube.c deleted file mode 100644 index 17767a148f9..00000000000 --- a/progs/demos/fbo_firecube.c +++ /dev/null @@ -1,1071 +0,0 @@ -/* - * Draw the "fire" test program on the six faces of a cube using - * fbo render-to-texture. - * - * Much of the code comes from David Bucciarelli's "fire" - * test program. The rest basically from Brian Paul's "gearbox" and - * fbotexture programs. - * - * By pressing the 'q' key, you can make the driver choose different - * internal texture RGBA formats by giving it different "format" and "type" - * arguments to the glTexImage2D function that creates the texture - * image being rendered to. If the driver doesn't support a texture image - * format as a render target, it will usually fall back to software when - * drawing the "fire" image, and frame-rate should drop considerably. - * - * Performance: - * The rendering speed of this program is usually dictated by fill rate - * and the fact that software fallbacks for glBitMap makes the driver - * operate synchronously. Low-end UMA hardware will probably see around - * 35 fps with the help screen disabled and 32bpp window- and user - * frame-buffers (2008). - * - * This program is released under GPL, following the "fire" licensing. - * - * Authors: - * David Bucciarelli ("fire") - * Brian Paul ("gearbox", "fbotexture") - * Thomas Hellstrom (Putting it together) - * - */ - -#include <math.h> -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <GL/glew.h> -#include <GL/glut.h> -#include "readtex.h" - - -/* - * Format of texture we render to. - */ - -#define TEXINTFORMAT GL_RGBA - -static GLuint texTypes[] = - {GL_UNSIGNED_BYTE, - GL_UNSIGNED_INT_8_8_8_8_REV, - GL_UNSIGNED_SHORT_1_5_5_5_REV, - GL_UNSIGNED_SHORT_4_4_4_4_REV, - GL_UNSIGNED_INT_8_8_8_8, - GL_UNSIGNED_SHORT_5_5_5_1, - GL_UNSIGNED_SHORT_4_4_4_4, - GL_UNSIGNED_INT_8_8_8_8_REV, - GL_UNSIGNED_SHORT_1_5_5_5_REV, - GL_UNSIGNED_SHORT_4_4_4_4_REV, - GL_UNSIGNED_INT_8_8_8_8, - GL_UNSIGNED_SHORT_5_5_5_1, - GL_UNSIGNED_SHORT_4_4_4_4, - GL_UNSIGNED_SHORT_5_6_5, - GL_UNSIGNED_SHORT_5_6_5_REV, - GL_UNSIGNED_SHORT_5_6_5, - GL_UNSIGNED_SHORT_5_6_5_REV}; - -static GLuint texFormats[] = - {GL_RGBA, - GL_RGBA, - GL_RGBA, - GL_RGBA, - GL_RGBA, - GL_RGBA, - GL_RGBA, - GL_BGRA, - GL_BGRA, - GL_BGRA, - GL_BGRA, - GL_BGRA, - GL_BGRA, - GL_RGB, - GL_RGB, - GL_BGR, - GL_BGR}; - -static const char *texNames[] = - {"GL_RGBA GL_UNSIGNED_BYTE", - "GL_RGBA GL_UNSIGNED_INT_8_8_8_8_REV", - "GL_RGBA GL_UNSIGNED_SHORT_1_5_5_5_REV", - "GL_RGBA GL_UNSIGNED_SHORT_4_4_4_4_REV", - "GL_RGBA GL_UNSIGNED_INT_8_8_8_8", - "GL_RGBA GL_UNSIGNED_INT_5_5_5_1", - "GL_RGBA GL_UNSIGNED_INT_4_4_4_4", - "GL_BGRA GL_UNSIGNED_INT_8_8_8_8_REV", - "GL_BGRA GL_UNSIGNED_SHORT_1_5_5_5_REV", - "GL_BGRA GL_UNSIGNED_SHORT_4_4_4_4_REV", - "GL_BGRA GL_UNSIGNED_INT_8_8_8_8", - "GL_BGRA GL_UNSIGNED_INT_5_5_5_1", - "GL_BGRA GL_UNSIGNED_INT_4_4_4_4", - "GL_RGB GL_UNSIGNED_INT_5_6_5", - "GL_RGB GL_UNSIGNED_INT_5_6_5_REV", - "GL_BGR GL_UNSIGNED_INT_5_6_5", - "GL_BGR GL_UNSIGNED_INT_5_6_5_REV"}; - - - - -#ifndef M_PI -#define M_PI 3.1415926535 -#endif - -#define vinit(a,i,j,k) { \ - (a)[0]=i; \ - (a)[1]=j; \ - (a)[2]=k; \ - } - -#define vinit4(a,i,j,k,w) { \ - (a)[0]=i; \ - (a)[1]=j; \ - (a)[2]=k; \ - (a)[3]=w; \ - } - - -#define vadds(a,dt,b) { \ - (a)[0]+=(dt)*(b)[0]; \ - (a)[1]+=(dt)*(b)[1]; \ - (a)[2]+=(dt)*(b)[2]; \ - } - -#define vequ(a,b) { \ - (a)[0]=(b)[0]; \ - (a)[1]=(b)[1]; \ - (a)[2]=(b)[2]; \ - } - -#define vinter(a,dt,b,c) { \ - (a)[0]=(dt)*(b)[0]+(1.0-dt)*(c)[0]; \ - (a)[1]=(dt)*(b)[1]+(1.0-dt)*(c)[1]; \ - (a)[2]=(dt)*(b)[2]+(1.0-dt)*(c)[2]; \ - } - -#define clamp(a) ((a) < 0.0 ? 0.0 : ((a) < 1.0 ? (a) : 1.0)) - -#define vclamp(v) { \ - (v)[0]=clamp((v)[0]); \ - (v)[1]=clamp((v)[1]); \ - (v)[2]=clamp((v)[2]); \ - } - -static GLint WinWidth = 800, WinHeight = 800; -static GLint TexWidth, TexHeight; -static GLuint TexObj; -static GLuint MyFB; -static GLuint DepthRB; -static GLboolean WireFrame = GL_FALSE; -static GLboolean Anim = GL_TRUE; -static GLint texType = 0; - -static GLint T0 = 0; -static GLint Frames = 0; -static GLint Win = 0; - -static GLfloat ViewRotX = 20.0, ViewRotY = 30.0, ViewRotZ = 0.0; -static GLfloat CubeRot = 0.0; - - -static void -idle(void); - - -static void -CheckError(int line) -{ - GLenum err = glGetError(); - if (err) { - printf("GL Error 0x%x at line %d\n", (int) err, line); - exit(1); - } -} - - -static void -cleanup(void) -{ - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); - glDeleteFramebuffersEXT(1, &MyFB); - glDeleteRenderbuffersEXT(1, &DepthRB); - glDeleteTextures(1, &TexObj); - glutDestroyWindow(Win); -} - -static GLint NiceFog = 1; - -#define DIMP 20.0 -#define DIMTP 16.0 - -#define RIDCOL 0.4 - -#define NUMTREE 50 -#define TREEINR 2.5 -#define TREEOUTR 8.0 - -#define AGRAV -9.8 - -typedef struct -{ - int age; - float p[3][3]; - float v[3]; - float c[3][4]; -} - part; - -static float treepos[NUMTREE][3]; - -static float black[3] = { 0.0, 0.0, 0.0 }; -static float blu[3] = { 1.0, 0.2, 0.0 }; -static float blu2[3] = { 1.0, 1.0, 0.0 }; - -static float fogcolor[4] = { 1.0, 1.0, 1.0, 1.0 }; - -static float q[4][3] = { - {-DIMP, 0.0, -DIMP}, - {DIMP, 0.0, -DIMP}, - {DIMP, 0.0, DIMP}, - {-DIMP, 0.0, DIMP} -}; - -static float qt[4][2] = { - {-DIMTP, -DIMTP}, - {DIMTP, -DIMTP}, - {DIMTP, DIMTP}, - {-DIMTP, DIMTP} -}; - -static int np; -static float eject_r, dt, maxage, eject_vy, eject_vl; -static short shadows; -static float ridtri; -static int fog = 0; -static int help = 1; - -static part *p; - -static GLuint groundid; -static GLuint treeid; - -static float obs[3] = { 2.0, 1.0, 0.0 }; -static float dir[3]; -static float v = 0.0; -static float alpha = -84.0; -static float beta = 90.0; - -static float -vrnd(void) -{ - return (((float) rand()) / RAND_MAX); -} - -static void -setnewpart(part * p) -{ - float a, v[3], *c; - - p->age = 0; - - a = vrnd() * 3.14159265359 * 2.0; - - vinit(v, sin(a) * eject_r * vrnd(), 0.15, cos(a) * eject_r * vrnd()); - vinit(p->p[0], v[0] + vrnd() * ridtri, v[1] + vrnd() * ridtri, - v[2] + vrnd() * ridtri); - vinit(p->p[1], v[0] + vrnd() * ridtri, v[1] + vrnd() * ridtri, - v[2] + vrnd() * ridtri); - vinit(p->p[2], v[0] + vrnd() * ridtri, v[1] + vrnd() * ridtri, - v[2] + vrnd() * ridtri); - - vinit(p->v, v[0] * eject_vl / (eject_r / 2), - vrnd() * eject_vy + eject_vy / 2, v[2] * eject_vl / (eject_r / 2)); - - c = blu; - - vinit4(p->c[0], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0); - vinit4(p->c[1], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0); - vinit4(p->c[2], c[0] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[1] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), - c[2] * ((1.0 - RIDCOL) + vrnd() * RIDCOL), 1.0); -} - -static void -setpart(part * p) -{ - float fact; - - if (p->p[0][1] < 0.1) { - setnewpart(p); - return; - } - - p->v[1] += AGRAV * dt; - - vadds(p->p[0], dt, p->v); - vadds(p->p[1], dt, p->v); - vadds(p->p[2], dt, p->v); - - p->age++; - - if ((p->age) > maxage) { - vequ(p->c[0], blu2); - vequ(p->c[1], blu2); - vequ(p->c[2], blu2); - } - else { - fact = 1.0 / maxage; - vadds(p->c[0], fact, blu2); - vclamp(p->c[0]); - p->c[0][3] = fact * (maxage - p->age); - - vadds(p->c[1], fact, blu2); - vclamp(p->c[1]); - p->c[1][3] = fact * (maxage - p->age); - - vadds(p->c[2], fact, blu2); - vclamp(p->c[2]); - p->c[2][3] = fact * (maxage - p->age); - } -} - -static void -drawtree(float x, float y, float z) -{ - glBegin(GL_QUADS); - glTexCoord2f(0.0, 0.0); - glVertex3f(x - 1.5, y + 0.0, z); - - glTexCoord2f(1.0, 0.0); - glVertex3f(x + 1.5, y + 0.0, z); - - glTexCoord2f(1.0, 1.0); - glVertex3f(x + 1.5, y + 3.0, z); - - glTexCoord2f(0.0, 1.0); - glVertex3f(x - 1.5, y + 3.0, z); - - - glTexCoord2f(0.0, 0.0); - glVertex3f(x, y + 0.0, z - 1.5); - - glTexCoord2f(1.0, 0.0); - glVertex3f(x, y + 0.0, z + 1.5); - - glTexCoord2f(1.0, 1.0); - glVertex3f(x, y + 3.0, z + 1.5); - - glTexCoord2f(0.0, 1.0); - glVertex3f(x, y + 3.0, z - 1.5); - - glEnd(); - -} - -static void -calcposobs(void) -{ - dir[0] = sin(alpha * M_PI / 180.0); - dir[2] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0); - dir[1] = cos(beta * M_PI / 180.0); - - if (dir[0] < 1.0e-5 && dir[0] > -1.0e-5) - dir[0] = 0; - if (dir[1] < 1.0e-5 && dir[1] > -1.0e-5) - dir[1] = 0; - if (dir[2] < 1.0e-5 && dir[2] > -1.0e-5) - dir[2] = 0; - - obs[0] += v * dir[0]; - obs[1] += v * dir[1]; - obs[2] += v * dir[2]; -} - -static void -printstring(void *font, const char *string) -{ - int len, i; - - len = (int) strlen(string); - for (i = 0; i < len; i++) - glutBitmapCharacter(font, string[i]); -} - - -static void -printhelp(void) -{ - glColor4f(0.0, 0.0, 0.0, 0.5); - glRecti(40, 40, 600, 440); - - glColor3f(1.0, 0.0, 0.0); - glRasterPos2i(300, 420); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Help"); - - glRasterPos2i(60, 390); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "h - Toggle Help"); - - glRasterPos2i(60, 360); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "t - Increase particle size"); - glRasterPos2i(60, 330); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "T - Decrease particle size"); - - glRasterPos2i(60, 300); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "r - Increase emission radius"); - glRasterPos2i(60, 270); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "R - Decrease emission radius"); - - glRasterPos2i(60, 240); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "f - Toggle Fog"); - glRasterPos2i(60, 210); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "s - Toggle shadows"); - glRasterPos2i(60, 180); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "q - Toggle texture format & type"); - glRasterPos2i(60, 150); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "a - Increase velocity"); - glRasterPos2i(60, 120); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "z - Decrease velocity"); - glRasterPos2i(60, 90); - printstring(GLUT_BITMAP_TIMES_ROMAN_24, "Arrow Keys - Rotate"); -} - - -static void -drawfire(void) -{ - static char frbuf[80] = ""; - int j; - static double t0 = -1.; - double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; - if (t0 < 0.0) - t0 = t; - dt = (t - t0) * 1.0; - t0 = t; - - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); - - glDisable(GL_LIGHTING); - - glShadeModel(GL_FLAT); - - glEnable(GL_BLEND); - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - - glEnable(GL_FOG); - glFogi(GL_FOG_MODE, GL_EXP); - glFogfv(GL_FOG_COLOR, fogcolor); - glFogf(GL_FOG_DENSITY, 0.1); - - - glViewport(0, 0, (GLint) TexWidth, (GLint) TexHeight); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - gluPerspective(70.0, TexWidth/ (float) TexHeight, 0.1, 30.0); - - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - - if (NiceFog) - glHint(GL_FOG_HINT, GL_NICEST); - else - glHint(GL_FOG_HINT, GL_DONT_CARE); - - glEnable(GL_DEPTH_TEST); - - if (fog) - glEnable(GL_FOG); - else - glDisable(GL_FOG); - - glDepthMask(GL_TRUE); - glClearColor(1.0, 1.0, 1.0, 1.0); - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); - - - glPushMatrix(); - calcposobs(); - gluLookAt(obs[0], obs[1], obs[2], - obs[0] + dir[0], obs[1] + dir[1], obs[2] + dir[2], - 0.0, 1.0, 0.0); - - glColor4f(1.0, 1.0, 1.0, 1.0); - - glEnable(GL_TEXTURE_2D); - - glBindTexture(GL_TEXTURE_2D, groundid); - glBegin(GL_QUADS); - glTexCoord2fv(qt[0]); - glVertex3fv(q[0]); - glTexCoord2fv(qt[1]); - glVertex3fv(q[1]); - glTexCoord2fv(qt[2]); - glVertex3fv(q[2]); - glTexCoord2fv(qt[3]); - glVertex3fv(q[3]); - glEnd(); - - glEnable(GL_ALPHA_TEST); - glAlphaFunc(GL_GEQUAL, 0.9); - - glBindTexture(GL_TEXTURE_2D, treeid); - for (j = 0; j < NUMTREE; j++) - drawtree(treepos[j][0], treepos[j][1], treepos[j][2]); - - glDisable(GL_TEXTURE_2D); - glDepthMask(GL_FALSE); - glDisable(GL_ALPHA_TEST); - - if (shadows) { - glBegin(GL_TRIANGLES); - for (j = 0; j < np; j++) { - glColor4f(black[0], black[1], black[2], p[j].c[0][3]); - glVertex3f(p[j].p[0][0], 0.1, p[j].p[0][2]); - - glColor4f(black[0], black[1], black[2], p[j].c[1][3]); - glVertex3f(p[j].p[1][0], 0.1, p[j].p[1][2]); - - glColor4f(black[0], black[1], black[2], p[j].c[2][3]); - glVertex3f(p[j].p[2][0], 0.1, p[j].p[2][2]); - } - glEnd(); - } - - glBegin(GL_TRIANGLES); - for (j = 0; j < np; j++) { - glColor4fv(p[j].c[0]); - glVertex3fv(p[j].p[0]); - - glColor4fv(p[j].c[1]); - glVertex3fv(p[j].p[1]); - - glColor4fv(p[j].c[2]); - glVertex3fv(p[j].p[2]); - - setpart(&p[j]); - } - glEnd(); - - - glDisable(GL_TEXTURE_2D); - glDisable(GL_ALPHA_TEST); - glDisable(GL_DEPTH_TEST); - glDisable(GL_FOG); - - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(-0.5, 639.5, -0.5, 479.5 - , -1.0, 1.0); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - - glColor3f(1.0, 0.0, 0.0); - glRasterPos2i(10, 10); - printstring(GLUT_BITMAP_HELVETICA_18, frbuf); - glColor3f(0.0, 0.0, 1.0); - glRasterPos2i(10, 450); - printstring(GLUT_BITMAP_HELVETICA_18, texNames[texType]); - glColor3f(1.0, 0.0, 0.0); - glRasterPos2i(10, 470); - printstring(GLUT_BITMAP_HELVETICA_10, - "Fire V1.5 Written by David Bucciarelli ([email protected])"); - - if (help) - printhelp(); - - glPopMatrix(); - glDepthMask(GL_TRUE); - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); - Frames++; - - { - GLint t = glutGet(GLUT_ELAPSED_TIME); - if (t - T0 >= 2000) { - GLfloat seconds = (t - T0) / 1000.0; - GLfloat fps = Frames / seconds; - sprintf(frbuf, "Frame rate: %f", fps); - T0 = t; - Frames = 0; - } - } - -} - -static void -regen_texImage(void) -{ - glBindTexture(GL_TEXTURE_2D, TexObj); - glTexImage2D(GL_TEXTURE_2D, 0, TEXINTFORMAT, TexWidth, TexHeight, 0, - texFormats[texType], texTypes[texType], NULL); - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); - glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - GL_TEXTURE_2D, TexObj, 0); - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); -} - -static void -key(unsigned char key, int x, int y) -{ - switch (key) { - case 27: - cleanup(); - exit(0); - break; - case ' ': - Anim = !Anim; - glutIdleFunc(Anim ? idle : NULL); - break; - case 'a': - v += 0.0005; - break; - case 'z': - v -= 0.0005; - break; - case 'h': - help = (!help); - break; - case 'f': - fog = (!fog); - break; - case 's': - shadows = !shadows; - break; - case 'R': - eject_r -= 0.03; - break; - case 'r': - eject_r += 0.03; - break; - case 't': - ridtri += 0.005; - break; - case 'T': - ridtri -= 0.005; - break; - case 'v': - ViewRotZ += 5.0; - break; - case 'V': - ViewRotZ -= 5.0; - break; - case 'w': - WireFrame = !WireFrame; - break; - case 'q': - if (++texType > 16) - texType = 0; - regen_texImage(); - break; - case 'n': - NiceFog = !NiceFog; - printf("NiceFog %d\n", NiceFog); - break; - } - glutPostRedisplay(); -} - -static void -inittextures(void) -{ - GLenum gluerr; - GLubyte tex[128][128][4]; - - glGenTextures(1, &groundid); - glBindTexture(GL_TEXTURE_2D, groundid); - - glPixelStorei(GL_UNPACK_ALIGNMENT, 4); - if (!LoadRGBMipmaps("../images/s128.rgb", GL_RGB)) { - fprintf(stderr, "Error reading a texture.\n"); - exit(-1); - } - - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); - - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, - GL_LINEAR_MIPMAP_LINEAR); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - - glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); - - glGenTextures(1, &treeid); - glBindTexture(GL_TEXTURE_2D, treeid); - - if (1) - { - int w, h; - GLenum format; - int x, y; - GLubyte *image = LoadRGBImage("../images/tree3.rgb", &w, &h, &format); - - if (!image) { - fprintf(stderr, "Error reading a texture.\n"); - exit(-1); - } - - for (y = 0; y < 128; y++) - for (x = 0; x < 128; x++) { - tex[x][y][0] = image[(y + x * 128) * 3]; - tex[x][y][1] = image[(y + x * 128) * 3 + 1]; - tex[x][y][2] = image[(y + x * 128) * 3 + 2]; - if ((tex[x][y][0] == tex[x][y][1]) && - (tex[x][y][1] == tex[x][y][2]) && (tex[x][y][2] == 255)) - tex[x][y][3] = 0; - else - tex[x][y][3] = 255; - } - - if ((gluerr = gluBuild2DMipmaps(GL_TEXTURE_2D, 4, 128, 128, GL_RGBA, - GL_UNSIGNED_BYTE, (GLvoid *) (tex)))) { - fprintf(stderr, "GLULib%s\n", (char *) gluErrorString(gluerr)); - exit(-1); - } - } - else { - if (!LoadRGBMipmaps("../images/tree2.rgba", GL_RGBA)) { - fprintf(stderr, "Error reading a texture.\n"); - exit(-1); - } - } - - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); - - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, - GL_LINEAR_MIPMAP_LINEAR); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - - glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); -} - -static void -inittree(void) -{ - int i; - float dist; - - for (i = 0; i < NUMTREE; i++) - do { - treepos[i][0] = vrnd() * TREEOUTR * 2.0 - TREEOUTR; - treepos[i][1] = 0.0; - treepos[i][2] = vrnd() * TREEOUTR * 2.0 - TREEOUTR; - dist = - sqrt(treepos[i][0] * treepos[i][0] + - treepos[i][2] * treepos[i][2]); - } while ((dist < TREEINR) || (dist > TREEOUTR)); -} - -static int -init_fire(int ac, char *av[]) -{ - int i; - - np = 800; - eject_r = -0.65; - dt = 0.015; - eject_vy = 4; - eject_vl = 1; - shadows = 1; - ridtri = 0.25; - - maxage = 1.0 / dt; - - if (ac == 2) - np = atoi(av[1]); - - - inittextures(); - - p = (part *) malloc(sizeof(part) * np); - - for (i = 0; i < np; i++) - setnewpart(&p[i]); - - inittree(); - - return (0); -} - - - - - - -static void -DrawCube(void) -{ - static const GLfloat texcoords[4][2] = { - { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 } - }; - static const GLfloat vertices[4][2] = { - { -1, -1 }, { 1, -1 }, { 1, 1 }, { -1, 1 } - }; - static const GLfloat xforms[6][4] = { - { 0, 0, 1, 0 }, - { 90, 0, 1, 0 }, - { 180, 0, 1, 0 }, - { 270, 0, 1, 0 }, - { 90, 1, 0, 0 }, - { -90, 1, 0, 0 } - }; - static const GLfloat mat[4] = { 1.0, 1.0, 0.5, 1.0 }; - GLint i, j; - - glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat); - glEnable(GL_TEXTURE_2D); - - glPushMatrix(); - glRotatef(ViewRotX, 1.0, 0.0, 0.0); - glRotatef(15, 1, 0, 0); - glRotatef(CubeRot, 0, 1, 0); - glScalef(4, 4, 4); - - for (i = 0; i < 6; i++) { - glPushMatrix(); - glRotatef(xforms[i][0], xforms[i][1], xforms[i][2], xforms[i][3]); - glTranslatef(0, 0, 1.1); - glBegin(GL_POLYGON); - glNormal3f(0, 0, 1); - for (j = 0; j < 4; j++) { - glTexCoord2fv(texcoords[j]); - glVertex2fv(vertices[j]); - } - glEnd(); - glPopMatrix(); - } - glPopMatrix(); - - glDisable(GL_TEXTURE_2D); -} - - -static void -draw(void) -{ - float ar; - static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0}; - - drawfire(); - - glLightfv(GL_LIGHT0, GL_POSITION, pos); - glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, - GL_SEPARATE_SPECULAR_COLOR); - - glEnable(GL_LIGHTING); - glEnable(GL_LIGHT0); - glEnable(GL_DEPTH_TEST); - glEnable(GL_NORMALIZE); - glDisable(GL_BLEND); - glDisable(GL_FOG); - - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); - glTranslatef(0.0, 0.0, -40.0); - - glClear(GL_DEPTH_BUFFER_BIT); - - /* draw textured cube */ - - glViewport(0, 0, WinWidth, WinHeight); - glClearColor(0.5, 0.5, 0.8, 0.0); - glClear(GL_COLOR_BUFFER_BIT); - - ar = (float) (WinWidth) / WinHeight; - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glFrustum(-ar, ar, -1.0, 1.0, 5.0, 60.0); - glMatrixMode(GL_MODELVIEW); - glBindTexture(GL_TEXTURE_2D, TexObj); - - DrawCube(); - - /* finish up */ - glutSwapBuffers(); -} - - -static void -idle(void) -{ - static double t0 = -1.; - double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0; - if (t0 < 0.0) - t0 = t; - dt = t - t0; - t0 = t; - - CubeRot = fmod(CubeRot + 15.0 * dt, 360.0); /* 15 deg/sec */ - - glutPostRedisplay(); -} - - -/* change view angle */ -static void -special(int k, int x, int y) -{ - (void) x; - (void) y; - switch (k) { - case GLUT_KEY_UP: - ViewRotX += 5.0; - break; - case GLUT_KEY_DOWN: - ViewRotX -= 5.0; - break; - case GLUT_KEY_LEFT: - ViewRotY += 5.0; - break; - case GLUT_KEY_RIGHT: - ViewRotY -= 5.0; - break; - default: - return; - } - glutPostRedisplay(); -} - - -/* new window size or exposure */ -static void -reshape(int width, int height) -{ - WinWidth = width; - WinHeight = height; -} - - -static void -init_fbotexture() -{ - static const GLenum depthFormats[] = { - GL_DEPTH_COMPONENT, - GL_DEPTH_COMPONENT16, - GL_DEPTH_COMPONENT32 - }; - static int numDepthFormats = sizeof(depthFormats) / sizeof(depthFormats[0]); - GLint i; - GLenum stat; - - /* gen framebuffer id, delete it, do some assertions, just for testing */ - glGenFramebuffersEXT(1, &MyFB); - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB); - glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &i); - - /* Make texture object/image */ - glGenTextures(1, &TexObj); - glBindTexture(GL_TEXTURE_2D, TexObj); - /* make one image level. */ - glTexImage2D(GL_TEXTURE_2D, 0, TEXINTFORMAT, TexWidth, TexHeight, 0, - texFormats[texType], texTypes[texType], NULL); - - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); - glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); - - CheckError(__LINE__); - - /* Render color to texture */ - glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - GL_TEXTURE_2D, TexObj, 0); - CheckError(__LINE__); - - - /* make depth renderbuffer */ - glGenRenderbuffersEXT(1, &DepthRB); - glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB); - /* we may have to try several formats */ - for (i = 0; i < numDepthFormats; i++) { - glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, depthFormats[i], - TexWidth, TexHeight); - CheckError(__LINE__); - - glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, - GL_RENDERBUFFER_EXT, DepthRB); - CheckError(__LINE__); - stat = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); - if (stat == GL_FRAMEBUFFER_COMPLETE_EXT) { - break; - } - } - - if (stat != GL_FRAMEBUFFER_COMPLETE_EXT) { - fprintf(stderr, "Error: unable to get usable FBO combination!\n"); - exit(1); - } - - glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, - GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i); - CheckError(__LINE__); - printf("Depth renderbuffer size = %d bits\n", i); - - glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); - - /* - * Check for completeness. - */ - -} - - -static void -init(int argc, char *argv[]) -{ - GLint i; - - if (!glutExtensionSupported("GL_EXT_framebuffer_object")) { - fprintf(stderr, "Sorry, GL_EXT_framebuffer_object is required!\n"); - exit(1); - } - - TexWidth = 512; - TexHeight = 512; - - init_fbotexture(); - init_fire(argc, argv); - - - for ( i=1; i<argc; i++ ) { - if (strcmp(argv[i], "-info")==0) { - printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); - printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); - printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); - printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS)); - } - } -} - - -static void -visible(int vis) -{ - if (vis == GLUT_VISIBLE) - glutIdleFunc(Anim ? idle : NULL); - else - glutIdleFunc(NULL); -} - - -int -main(int argc, char *argv[]) -{ - glutInitWindowSize(WinWidth, WinHeight); - glutInit(&argc, argv); - - glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); - - Win = glutCreateWindow("fbo_firecube"); - glewInit(); - init(argc, argv); - - glutDisplayFunc(draw); - glutReshapeFunc(reshape); - glutKeyboardFunc(key); - glutSpecialFunc(special); - glutVisibilityFunc(visible); - - glutMainLoop(); - return 0; /* ANSI C requires main to return int. */ -} |