src/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 <glad/glad.h>
  29 #include "glut_wrap.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 errnum;
  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    fflush(stderr);
  53
  54    /* Setup the fragment program */
  55    glGenProgramsARB(1, &prognum);
  56    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
  57    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  58                       strlen(prog1), (const GLubyte *)prog1);
  59
  60    errnum = glGetError();
  61    printf("glGetError = 0x%x\n", errnum);
  62    if (errnum != GL_NO_ERROR) {
  63       GLint errorpos;
  64
  65       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  66       printf("errorpos: %d\n", errorpos);
  67       printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
  68              (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  69    }
  70    glEnable(GL_FRAGMENT_PROGRAM_ARB);
  71
  72     glClearColor(0.0, 0.0, 1.0, 0.0);
  73 }
  74
  75 static void Reshape(int width, int height)
  76 {
  77
  78     glViewport(0, 0, (GLint)width, (GLint)height);
  79
  80     glMatrixMode(GL_PROJECTION);
  81     glLoadIdentity();
  82 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  83     glMatrixMode(GL_MODELVIEW);
  84 }
  85
  86 static void Key(unsigned char key, int x, int y)
  87 {
  88
  89     switch (key) {
  90       case 27:
  91         exit(1);
  92       default:
  93         break;
  94     }
  95
  96     glutPostRedisplay();
  97 }
  98
  99 static void Draw(void)
 100 {
 101    glClear(GL_COLOR_BUFFER_BIT);
 102
 103    glBegin(GL_TRIANGLES);
 104    glColor3f(0,0,.7);
 105    glTexCoord3f(0,0,.7);
 106    glVertex3f( 0.9, -0.9, -0.0);
 107    glColor3f(.8,0,0);
 108    glTexCoord3f(.8,0,0);
 109    glVertex3f( 0.9,  0.9, -0.0);
 110    glColor3f(0,.9,0);
 111    glTexCoord3f(0,.9,0);
 112    glVertex3f(-0.9,  0.0, -0.0);
 113    glEnd();
 114
 115    glFlush();
 116
 117    if (doubleBuffer) {
 118       glutSwapBuffers();
 119    }
 120 }
 121
 122 static GLenum Args(int argc, char **argv)
 123 {
 124     GLint i;
 125
 126     doubleBuffer = GL_FALSE;
 127
 128     for (i = 1; i < argc; i++) {
 129         if (strcmp(argv[i], "-sb") == 0) {
 130             doubleBuffer = GL_FALSE;
 131         } else if (strcmp(argv[i], "-db") == 0) {
 132             doubleBuffer = GL_TRUE;
 133         } else {
 134             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 135             return GL_FALSE;
 136         }
 137     }
 138     return GL_TRUE;
 139 }
 140
 141 int main(int argc, char **argv)
 142 {
 143     GLenum type;
 144
 145     glutInit(&argc, argv);
 146
 147     if (Args(argc, argv) == GL_FALSE) {
 148         exit(1);
 149     }
 150
 151     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 152
 153     type = GLUT_RGB | GLUT_ALPHA;
 154     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 155     glutInitDisplayMode(type);
 156
 157     if (glutCreateWindow(*argv) == GL_FALSE) {
 158         exit(1);
 159     }
 160
 161     gladLoadGL();
 162
 163     Init();
 164
 165     glutReshapeFunc(Reshape);
 166     glutKeyboardFunc(Key);
 167     glutDisplayFunc(Draw);
 168     glutMainLoop();
 169         return 0;
 170 }