diff options
Diffstat (limited to 'progs/demos/fbo_firecube.c')
| -rw-r--r-- | progs/demos/fbo_firecube.c | 1041 |
1 files changed, 1041 insertions, 0 deletions
diff --git a/progs/demos/fbo_firecube.c b/progs/demos/fbo_firecube.c new file mode 100644 index 0000000000..ed87dd133c --- /dev/null +++ b/progs/demos/fbo_firecube.c @@ -0,0 +1,1041 @@ +/* + * 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) + * + */ + +#define GL_GLEXT_PROTOTYPES +#include <math.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.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 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 +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 (tech.hmw@plus.it)"); + + 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 '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() +{ + GLint i; + + /* 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); + glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, + TexWidth, TexHeight); + CheckError(__LINE__); + glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT, + GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i); + CheckError(__LINE__); + printf("Depth renderbuffer size = %d bits\n", i); + + /* attach DepthRB to MyFB */ + glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, + GL_RENDERBUFFER_EXT, DepthRB); + CheckError(__LINE__); + 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(idle); + else + glutIdleFunc(NULL); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + + glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE); + + glutInitWindowSize(WinWidth, WinHeight); + Win = glutCreateWindow("fbo_firecube"); + init(argc, argv); + + glutDisplayFunc(draw); + glutReshapeFunc(reshape); + glutKeyboardFunc(key); + glutSpecialFunc(special); + glutVisibilityFunc(visible); + + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |