+++ /dev/null
-/*
- * 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 (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 ' ':
- 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. */
-}
projects / mesa.git / blobdiff