progs/trivial/tri-fp.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <GL/glew.h>
  29 #include <GL/glut.h>
  30
  31
  32 #define CI_OFFSET_1 16
  33 #define CI_OFFSET_2 32
  34
  35
  36 GLenum doubleBuffer;
  37
  38 static void Init(void)
  39 {
  40    GLint errno;
  41    GLuint prognum;
  42    static const char *prog1 =
  43       "!!ARBfp1.0\n"
  44       "MOV  result.color, fragment.texcoord[1];\n"
  45 //      "MOV  result.color, fragment.color;\n"
  46       "END\n";
  47
  48
  49    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  50    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  51    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  52
  53    /* Setup the fragment program */
  54    glGenProgramsARB(1, &prognum);
  55    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
  56    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  57                       strlen(prog1), (const GLubyte *)prog1);
  58
  59    errno = glGetError();
  60    printf("glGetError = 0x%x\n", errno);
  61    if (errno != GL_NO_ERROR) {
  62       GLint errorpos;
  63
  64       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  65       printf("errorpos: %d\n", errorpos);
  66       printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
  67              (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  68    }
  69    glEnable(GL_FRAGMENT_PROGRAM_ARB);
  70
  71     glClearColor(0.0, 0.0, 1.0, 0.0);
  72 }
  73
  74 static void Reshape(int width, int height)
  75 {
  76
  77     glViewport(0, 0, (GLint)width, (GLint)height);
  78
  79     glMatrixMode(GL_PROJECTION);
  80     glLoadIdentity();
  81 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  82     glMatrixMode(GL_MODELVIEW);
  83 }
  84
  85 static void Key(unsigned char key, int x, int y)
  86 {
  87
  88     switch (key) {
  89       case 27:
  90         exit(1);
  91       default:
  92         return;
  93     }
  94
  95     glutPostRedisplay();
  96 }
  97
  98 static void Draw(void)
  99 {
 100    glClear(GL_COLOR_BUFFER_BIT);
 101
 102    glBegin(GL_TRIANGLES);
 103    glColor3f(0,0,.7);
 104    glTexCoord3f(0,0,.7);
 105    glVertex3f( 0.9, -0.9, -0.0);
 106    glColor3f(.8,0,0);
 107    glTexCoord3f(.8,0,0);
 108    glVertex3f( 0.9,  0.9, -0.0);
 109    glColor3f(0,.9,0);
 110    glTexCoord3f(0,.9,0);
 111    glVertex3f(-0.9,  0.0, -0.0);
 112    glEnd();
 113
 114    glFlush();
 115
 116    if (doubleBuffer) {
 117       glutSwapBuffers();
 118    }
 119 }
 120
 121 static GLenum Args(int argc, char **argv)
 122 {
 123     GLint i;
 124
 125     doubleBuffer = GL_FALSE;
 126
 127     for (i = 1; i < argc; i++) {
 128         if (strcmp(argv[i], "-sb") == 0) {
 129             doubleBuffer = GL_FALSE;
 130         } else if (strcmp(argv[i], "-db") == 0) {
 131             doubleBuffer = GL_TRUE;
 132         } else {
 133             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 134             return GL_FALSE;
 135         }
 136     }
 137     return GL_TRUE;
 138 }
 139
 140 int main(int argc, char **argv)
 141 {
 142     GLenum type;
 143
 144     glutInit(&argc, argv);
 145
 146     if (Args(argc, argv) == GL_FALSE) {
 147         exit(1);
 148     }
 149
 150     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 151
 152     type = GLUT_RGB | GLUT_ALPHA;
 153     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 154     glutInitDisplayMode(type);
 155
 156     if (glutCreateWindow("First Tri") == GL_FALSE) {
 157         exit(1);
 158     }
 159
 160     glewInit();
 161
 162     Init();
 163
 164     glutReshapeFunc(Reshape);
 165     glutKeyboardFunc(Key);
 166     glutDisplayFunc(Draw);
 167     glutMainLoop();
 168         return 0;
 169 }