diff options
Diffstat (limited to 'progs/fp/fp-tri.c')
| -rw-r--r-- | progs/fp/fp-tri.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/progs/fp/fp-tri.c b/progs/fp/fp-tri.c new file mode 100644 index 0000000000..52a8fcfc22 --- /dev/null +++ b/progs/fp/fp-tri.c @@ -0,0 +1,256 @@ + +#include <stdio.h> +#include <string.h> +#include <stdlib.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" + +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 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)); + + /* 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); + + + /* Load texture */ + glGenTextures(1, &Texture); + glBindTexture(GL_TEXTURE_2D, Texture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + 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); + } + + + glGenTextures(1, &Texture); + glActiveTextureARB(GL_TEXTURE0_ARB + 1); + glBindTexture(GL_TEXTURE_2D, Texture); + 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 ); + } + + + 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); + default: + return; + } + + 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); + glBegin(GL_TRIANGLES); + + glColor3f(0,0,1); + glTexCoord3f(1,1,0); + glVertex3f( 0.9, -0.9, -30.0); + + glColor3f(1,0,0); + glTexCoord3f(1,-1,0); + glVertex3f( 0.9, 0.9, -30.0); + + glColor3f(0,1,0); + glTexCoord3f(-1,0,0); + glVertex3f(-0.9, 0.0, -30.0); + glEnd(); + + glFlush(); + if (show_fps) { + ++frame_cnt; + glutPostRedisplay(); + } +} + + +int main(int argc, char **argv) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(250, 250); + 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; +} |