268 lines
6.0 KiB
C
268 lines
6.0 KiB
C
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifndef WIN32
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#include <unistd.h>
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#include <signal.h>
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#endif
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#include <GL/glew.h>
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#include <GL/glut.h>
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#include "readtex.c"
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#define TEXTURE_FILE "../images/bw.rgb"
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unsigned show_fps = 0;
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unsigned int frame_cnt = 0;
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void alarmhandler(int);
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static const char *filename = NULL;
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static void usage(char *name)
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{
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fprintf(stderr, "usage: %s [ options ] shader_filename\n", name);
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#ifndef WIN32
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fprintf(stderr, "\n" );
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fprintf(stderr, "options:\n");
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fprintf(stderr, " -fps show frames per second\n");
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#endif
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}
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#ifndef WIN32
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void alarmhandler (int sig)
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{
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if (sig == SIGALRM) {
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printf("%d frames in 5.0 seconds = %.3f FPS\n", frame_cnt,
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frame_cnt / 5.0);
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frame_cnt = 0;
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}
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signal(SIGALRM, alarmhandler);
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alarm(5);
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}
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#endif
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static void args(int argc, char *argv[])
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{
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GLint i;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-fps") == 0) {
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show_fps = 1;
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}
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else if (i == argc - 1) {
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filename = argv[i];
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}
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else {
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usage(argv[0]);
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exit(1);
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}
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}
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if (!filename) {
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usage(argv[0]);
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exit(1);
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}
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}
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static void Init( void )
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{
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GLuint Texture;
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GLint errno;
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GLuint prognum;
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char buf[50000];
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GLuint sz;
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FILE *f;
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if ((f = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "Couldn't open %s\n", filename);
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exit(1);
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}
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sz = fread(buf, 1, sizeof(buf), f);
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if (!feof(f)) {
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fprintf(stderr, "file too long\n");
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exit(1);
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}
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fprintf(stderr, "%.*s\n", sz, buf);
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if (!GLEW_ARB_fragment_program) {
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printf("Error: GL_ARB_fragment_program not supported!\n");
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exit(1);
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}
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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/* Setup the fragment program */
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glGenProgramsARB(1, &prognum);
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glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
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glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
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sz, (const GLubyte *)buf);
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errno = glGetError();
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printf("glGetError = 0x%x\n", errno);
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if (errno != GL_NO_ERROR) {
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GLint errorpos;
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glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
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printf("errorpos: %d\n", errorpos);
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printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
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(char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
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}
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glEnable(GL_FRAGMENT_PROGRAM_ARB);
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/* Load texture */
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glGenTextures(1, &Texture);
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glBindTexture(GL_TEXTURE_2D, Texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
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printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
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exit(1);
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}
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glGenTextures(1, &Texture);
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glActiveTextureARB(GL_TEXTURE0_ARB + 1);
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glBindTexture(GL_TEXTURE_2D, Texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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{
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GLubyte data[32][32];
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int width = 32;
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int height = 32;
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int i;
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int j;
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for (i = 0; i < 32; i++)
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for (j = 0; j < 32; j++)
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{
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/**
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** +-----------+
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** | W |
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** | +-----+ |
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** | | | |
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** | | B | |
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** | | | |
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** | +-----+ |
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** | |
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** +-----------+
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**/
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int i2 = i - height / 2;
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int j2 = j - width / 2;
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int h8 = height / 8;
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int w8 = width / 8;
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if ( -h8 <= i2 && i2 <= h8 && -w8 <= j2 && j2 <= w8 ) {
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data[i][j] = 0x00;
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} else if ( -2 * h8 <= i2 && i2 <= 2 * h8 && -2 * w8 <= j2 && j2 <= 2 * w8 ) {
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data[i][j] = 0x55;
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} else if ( -3 * h8 <= i2 && i2 <= 3 * h8 && -3 * w8 <= j2 && j2 <= 3 * w8 ) {
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data[i][j] = 0xaa;
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} else {
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data[i][j] = 0xff;
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}
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}
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glTexImage2D( GL_TEXTURE_2D, 0,
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GL_ALPHA8,
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32, 32, 0,
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GL_ALPHA, GL_UNSIGNED_BYTE, data );
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}
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{
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const float Ambient[4] = { 0.0, 1.0, 0.0, 0.0 };
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const float Diffuse[4] = { 1.0, 0.0, 0.0, 0.0 };
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const float Specular[4] = { 0.0, 0.0, 1.0, 0.0 };
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const float Emission[4] = { 0.0, 0.0, 0.0, 1.0 };
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glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, Ambient);
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glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, Diffuse);
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glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, Specular);
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glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, Emission);
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}
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glClearColor(.1, .3, .5, 0);
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}
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static void Reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
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glMatrixMode(GL_MODELVIEW);
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}
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static void Key(unsigned char key, int x, int y)
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{
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switch (key) {
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case 27:
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exit(1);
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default:
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break;
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}
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glutPostRedisplay();
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}
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static void Display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, 1.0, 1.0, 0.0, 0.0);
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glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, 0.0, 0.0, 1.0, 1.0);
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glBegin(GL_TRIANGLES);
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glColor3f(0,0,1);
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glTexCoord3f(1,1,0);
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glVertex3f( 0.9, -0.9, -30.0);
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glColor3f(1,0,0);
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glTexCoord3f(1,-1,0);
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glVertex3f( 0.9, 0.9, -30.0);
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glColor3f(0,1,0);
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glTexCoord3f(-1,0,0);
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glVertex3f(-0.9, 0.0, -30.0);
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glEnd();
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glFlush();
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if (show_fps) {
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++frame_cnt;
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glutPostRedisplay();
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}
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}
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int main(int argc, char **argv)
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{
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glutInit(&argc, argv);
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glutInitWindowPosition(0, 0);
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glutInitWindowSize(250, 250);
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glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
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args(argc, argv);
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glutCreateWindow(filename);
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glewInit();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Display);
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Init();
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#ifndef WIN32
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if (show_fps) {
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signal(SIGALRM, alarmhandler);
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alarm(5);
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}
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#endif
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glutMainLoop();
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return 0;
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}
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