Attachment 32446 Details for Bug 25871 – fp-tri.c

fp-tri.c

fp-tri.c (text/plain), 10.04 KB, created by Pierre Ossman on 2010-01-04 13:48:51 UTC

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Creator: Pierre Ossman

Created: 2010-01-04 13:48:51 UTC

Size: 10.04 KB

patch

obsolete

>
>#include <stdio.h>
>#include <string.h>
>#include <stdlib.h>
>#include <math.h>
>
>#ifndef WIN32
>#include <unistd.h>
>#include <signal.h>
>#endif
>
>#include <GL/glew.h>
>#include <GL/glut.h>
>
>#include "readtex.c"
>
>
>#define TEXTURE_FILE "../images/bw.rgb"
>
>#define TEXTURE_SIZE 4
>
>unsigned show_fps = 0;
>unsigned int frame_cnt = 0;
>void alarmhandler(int);
>static const char *filename = NULL;
>
>static void usage(char *name)
>{
>   fprintf(stderr, "usage: %s [ options ] shader_filename\n", name);
>#ifndef WIN32
>   fprintf(stderr, "\n" );
>   fprintf(stderr, "options:\n");
>   fprintf(stderr, "    -fps  show frames per second\n");
>#endif
>}
>
>#ifndef WIN32
>void alarmhandler (int sig)
>{
>   if (sig == SIGALRM) {
>      printf("%d frames in 5.0 seconds = %.3f FPS\n", frame_cnt,
>             frame_cnt / 5.0);
>
>      frame_cnt = 0;
>   }
>   signal(SIGALRM, alarmhandler);
>   alarm(5);
>}
>#endif
>
>static void args(int argc, char *argv[])
>{
>   GLint i;
>
>   for (i = 1; i < argc; i++) {
>      if (strcmp(argv[i], "-fps") == 0) {
>         show_fps = 1;
>      }
>      else if (i == argc - 1) {
>	 filename = argv[i];
>      }
>      else {
>	 usage(argv[0]);
>	 exit(1);
>      }
>   }
>
>   if (!filename) {
>      usage(argv[0]);
>      exit(1);
>   }
>}
>static GLboolean
>CheckError( int line )
>{
>   GLenum error = glGetError();
>   if (error) {
>      char *err = (char *) gluErrorString( error );
>      fprintf( stderr, "GL Error: %s at line %d\n", err, line );
>      return GL_TRUE;
>   }
>   return GL_FALSE;
>}
>
>static float MitchellNetravali(float x, float B, float C)
>{
>  float val = 0;
>  float ax = fabs(x);
>  if (ax<1.0f)
>  {
>    val =  ((12 - 9*B - 6*C) * ax * ax * ax +
>            (-18 + 12*B + 6*C) * ax * ax +
>            (6 - 2*B))/6;
>  }
>  else if (ax<2.0f)
>  {
>    val =  ((-B - 6*C) * ax * ax * ax + 
>            (6*B + 30*C) * ax * ax + (-12*B - 48*C) * 
>            ax + (8*B + 24*C)) / 6;
>  }
>  else
>  {
>    val = 0;
>  }
>//  val = ((val + 0.5) / 2);
>  return val;
>}
>
>static void Init( void )
>{
>   GLuint Texture;
>   GLint errno;
>   GLuint prognum;
>   char buf[4096];
>   GLuint sz;
>   FILE *f;
>
>   if ((f = fopen(filename, "r")) == NULL) {
>      fprintf(stderr, "Couldn't open %s\n", filename);
>      exit(1);
>   }
>
>   sz = fread(buf, 1, sizeof(buf), f);
>   if (!feof(f)) {
>      fprintf(stderr, "file too long\n");
>      exit(1);
>   }
>   fprintf(stderr, "%.*s\n", sz, buf);
>
>   if (!GLEW_ARB_fragment_program) {
>      printf("Error: GL_ARB_fragment_program not supported!\n");
>      exit(1);
>   }
>   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
>
>
>   /* Load texture */
>   glGenTextures(1, &Texture);
>   glBindTexture(GL_TEXTURE_2D, Texture);
>   glEnable(GL_TEXTURE_2D);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
>   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
>/*
>   if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
>      printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
>      exit(1);
>   }
>*/
>   {
>      const int size = TEXTURE_SIZE;
>      GLubyte img[size*size*4];
>
>      memset(img, 0x00, sizeof(img));
>
>      GLubyte *ptr = img;
>#if 1
>      for (int y = 0; y < size; y++)
>      {
>        for (int x = 0; x < size; x++)
>        {
>          *ptr++ = ((x & 1) && (y & 1)) * 0xff;
>          *ptr++ = ((x & 1) && (y & 1)) * 0xff;
>          *ptr++ = ((x & 1) && (y & 1)) * 0xff;
>          *ptr++ = 0xff;
>        }
>      }
>#endif
>      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size, size, 0, GL_RGBA, GL_UNSIGNED_BYTE, img);
>   }
>
>
>#if 0
>   glGenTextures(1, &Texture);
>   glActiveTextureARB(GL_TEXTURE1_ARB);
>   glBindTexture(GL_TEXTURE_2D, Texture);
>   glEnable(GL_TEXTURE_2D);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
>
>   {
>      GLubyte data[32][32];
>      int width = 32;
>      int height = 32;
>      int i;
>      int j;
>
>      for (i = 0; i < 32; i++)
>         for (j = 0; j < 32; j++)
>	 {
>	    /**
>	     ** +-----------+
>	     ** |     W     |
>	     ** |  +-----+  |
>	     ** |  |     |  |
>	     ** |  |  B  |  |
>	     ** |  |     |  |
>	     ** |  +-----+  |
>	     ** |           |
>	     ** +-----------+
>	     **/
>	    int i2 = i - height / 2;
>	    int j2 = j - width / 2;
>	    int h8 = height / 8;
>	    int w8 = width / 8;
>	    if ( -h8 <= i2 && i2 <= h8 && -w8 <= j2 && j2 <= w8 ) {
>	       data[i][j] = 0x00;
>	    } else if ( -2 * h8 <= i2 && i2 <= 2 * h8 && -2 * w8 <= j2 && j2 <= 2 * w8 ) {
>	       data[i][j] = 0x55;
>	    } else if ( -3 * h8 <= i2 && i2 <= 3 * h8 && -3 * w8 <= j2 && j2 <= 3 * w8 ) {
>	       data[i][j] = 0xaa;
>	    } else {
>	       data[i][j] = 0xff;
>	    }
>	 }
>
>      glTexImage2D( GL_TEXTURE_2D, 0,
>                    GL_ALPHA8,
>                    32, 32, 0,
>                    GL_ALPHA, GL_UNSIGNED_BYTE, data );
>   }
>#endif
>
>   {
>      const int size = 256;
>      const float B = 0.3f, C = 0.3f;
>
>
>      glGenTextures(1, &Texture);
>      glActiveTextureARB(GL_TEXTURE2_ARB);
>      glBindTexture(GL_TEXTURE_2D, Texture);
>      glEnable(GL_TEXTURE_2D);
>      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
>      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
>
>#if 0
>      float img[size*4];
>
>      memset(img, 0, sizeof(float)*size*4);
>
>      float *ptr = img;
>      float x, val;
>
>#define FUDGE(val) ((val + 1.0f) / 2.0f)
>
>      for (int i = 0; i<size ; i++)
>      {
>        x = (float)i / (float)(size - 1);
>
>        val = MitchellNetravali(x+1, B, C);
>        *ptr = FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(x, B, C);
>        *ptr = FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(1-x, B, C);
>        *ptr = FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(2-x, B, C);
>        *ptr = FUDGE(val);
>        ptr++;
>      }
>   CheckError(__LINE__);
>
>      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, size, 1, 0, GL_RGBA, GL_FLOAT, img);
>
>   CheckError(__LINE__);
>#else
>      GLubyte img[size*4];
>
>      memset(img, 0, sizeof(GLubyte)*size*4);
>
>      GLubyte *ptr = img;
>      float x, val;
>
>//#define FUDGE(x) (val * 65536.0f)
>#define FUDGE(val) ((val + 1.0f) / 2.0f * 255.0f)
>
>      for (int i = 0; i<size ; i++)
>      {
>        x = (float)i / (float)(size - 1);
>
>        val = MitchellNetravali(x+1, B, C);
>        *ptr = (GLubyte)FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(x, B, C);
>        *ptr = (GLubyte)FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(1-x, B, C);
>        *ptr = (GLubyte)FUDGE(val);
>        ptr++;
>
>        val = MitchellNetravali(2-x, B, C);
>        *ptr = (GLubyte)FUDGE(val);
>        ptr++;
>      }
>
>      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, img);
>#endif
>   }
>
>   /* Setup the fragment program */
>   glGenProgramsARB(1, &prognum);
>   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
>   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
>                      sz, (const GLubyte *)buf);
>
>   errno = glGetError();
>   printf("glGetError = 0x%x\n", errno);
>   if (errno != GL_NO_ERROR) {
>      GLint errorpos;
>
>      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
>      printf("errorpos: %d\n", errorpos);
>      printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
>             (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
>   }
>   glEnable(GL_FRAGMENT_PROGRAM_ARB);
>
>   glClearColor(.1, .3, .5, 0);
>}
>
>static void Reshape(int width, int height)
>{
>
>    glViewport(0, 0, (GLint)width, (GLint)height);
>
>    glMatrixMode(GL_PROJECTION);
>    glLoadIdentity();
>    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
>    glMatrixMode(GL_MODELVIEW);
>}
>
>static void Key(unsigned char key, int x, int y)
>{
>
>    switch (key) {
>      case 27:
>	exit(1);
>	    case ' ':
>        if (glIsEnabled(GL_FRAGMENT_PROGRAM_ARB))
>          glDisable(GL_FRAGMENT_PROGRAM_ARB);
>        else
>          glEnable(GL_FRAGMENT_PROGRAM_ARB);
>        break;
>      default:
>	break;
>    }
>
>    glutPostRedisplay();
>}
>
>static void Display(void)
>{
>   glClear(GL_COLOR_BUFFER_BIT);
>
>//   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, 1.0, 1.0, 0.0, 0.0);
>//   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, 0.0, 0.0, 1.0, 1.0);
>
>  glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0,
>                               TEXTURE_SIZE, TEXTURE_SIZE, 0.0f, 0.0f);
>
>  // Pixel steps
>  float step = 1.0f/TEXTURE_SIZE;
>  glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1,
>                               step, step, -step, -step);
>
>
>   float offset = step/2.0f;
>   offset = 0.0f;
>
>   glBegin(GL_TRIANGLES);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,1.0f + offset,1.0f + offset,0);
>   glVertex3f( 0.9, -0.9, -30.0);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,1.0f + offset,0.0f + offset,0);
>   glVertex3f( 0.9,  0.9, -30.0);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,0.0f + offset,0.0f + offset,0);
>   glVertex3f(-0.9,  0.9, -30.0);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,1.0f + offset,1.0f + offset,0);
>   glVertex3f( 0.9, -0.9, -30.0);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,0.0f + offset,0.0f + offset,0);
>   glVertex3f(-0.9,  0.9, -30.0);
>
>   glColor3f(1,1,1);
>   glMultiTexCoord3fARB(GL_TEXTURE0,0.0f + offset,1.0f + offset,0);
>   glVertex3f(-0.9, -0.9, -30.0);
>
>   glEnd();
>
>   glFlush();
>   if (show_fps) {
>      ++frame_cnt;
>      glutPostRedisplay();
>   }
>}
>
>
>int main(int argc, char **argv)
>{
>   glutInit(&argc, argv);
>   glutInitWindowPosition(0, 0);
>   glutInitWindowSize(512, 512);
>   glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
>   args(argc, argv);
>   glutCreateWindow(filename);
>   glewInit();
>   glutReshapeFunc(Reshape);
>   glutKeyboardFunc(Key);
>   glutDisplayFunc(Display);
>   Init();
>#ifndef WIN32
>   if (show_fps) {
>      signal(SIGALRM, alarmhandler);
>      alarm(5);
>   }
>#endif
>   glutMainLoop();
>   return 0;
>}

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Attachments on bug 25871: 32446 | 32447 | 43951 | 66984

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