Initial revision
diff --git a/progs/samples/texture.c b/progs/samples/texture.c
new file mode 100644
index 0000000..7ee41ee
--- /dev/null
+++ b/progs/samples/texture.c
@@ -0,0 +1,474 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
+ * ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+
+#include "loadppm.c"
+
+GLenum doubleBuffer;
+
+char *texFileName = 0;
+PPMImage *image;
+
+float *minFilter, *magFilter, *sWrapMode, *tWrapMode;
+float decal[] = {GL_DECAL};
+float modulate[] = {GL_MODULATE};
+float repeat[] = {GL_REPEAT};
+float clamp[] = {GL_CLAMP};
+float nr[] = {GL_NEAREST};
+float ln[] = {GL_LINEAR};
+float nr_mipmap_nr[] = {GL_NEAREST_MIPMAP_NEAREST};
+float nr_mipmap_ln[] = {GL_NEAREST_MIPMAP_LINEAR};
+float ln_mipmap_nr[] = {GL_LINEAR_MIPMAP_NEAREST};
+float ln_mipmap_ln[] = {GL_LINEAR_MIPMAP_LINEAR};
+GLint sphereMap[] = {GL_SPHERE_MAP};
+
+GLenum doSphere = GL_FALSE;
+float xRotation = 0.0, yRotation = 0.0, zTranslate = -3.125;
+
+GLint cube;
+float c[6][4][3] = {
+ {
+ {
+ 1.0, 1.0, -1.0
+ },
+ {
+ -1.0, 1.0, -1.0
+ },
+ {
+ -1.0, -1.0, -1.0
+ },
+ {
+ 1.0, -1.0, -1.0
+ }
+ },
+ {
+ {
+ 1.0, 1.0, 1.0
+ },
+ {
+ 1.0, 1.0, -1.0
+ },
+ {
+ 1.0, -1.0, -1.0
+ },
+ {
+ 1.0, -1.0, 1.0
+ }
+ },
+ {
+ {
+ -1.0, 1.0, 1.0
+ },
+ {
+ 1.0, 1.0, 1.0
+ },
+ {
+ 1.0, -1.0, 1.0
+ },
+ {
+ -1.0, -1.0, 1.0
+ }
+ },
+ {
+ {
+ -1.0, 1.0, -1.0
+ },
+ {
+ -1.0, 1.0, 1.0
+ },
+ {
+ -1.0, -1.0, 1.0
+ },
+ {
+ -1.0, -1.0, -1.0
+ }
+ },
+ {
+ {
+ -1.0, 1.0, 1.0
+ },
+ {
+ -1.0, 1.0, -1.0
+ },
+ {
+ 1.0, 1.0, -1.0
+ },
+ {
+ 1.0, 1.0, 1.0
+ }
+ },
+ {
+ {
+ -1.0, -1.0, -1.0
+ },
+ {
+ -1.0, -1.0, 1.0
+ },
+ {
+ 1.0, -1.0, 1.0
+ },
+ {
+ 1.0, -1.0, -1.0
+ }
+ }
+};
+static float n[6][3] = {
+ {
+ 0.0, 0.0, -1.0
+ },
+ {
+ 1.0, 0.0, 0.0
+ },
+ {
+ 0.0, 0.0, 1.0
+ },
+ {
+ -1.0, 0.0, 0.0
+ },
+ {
+ 0.0, 1.0, 0.0
+ },
+ {
+ 0.0, -1.0, 0.0
+ }
+};
+static float t[6][4][2] = {
+ {
+ {
+ 1.1, 1.1
+ },
+ {
+ -0.1, 1.1
+ },
+ {
+ -0.1, -0.1
+ },
+ {
+ 1.1, -0.1
+ }
+ },
+ {
+ {
+ 1.1, 1.1
+ },
+ {
+ -0.1, 1.1
+ },
+ {
+ -0.1, -0.1
+ },
+ {
+ 1.1, -0.1
+ }
+ },
+ {
+ {
+ -0.1, 1.1
+ },
+ {
+ 1.1, 1.1
+ },
+ {
+ 1.1, -0.1
+ },
+ {
+ -0.1, -0.1
+ }
+ },
+ {
+ {
+ 1.1, 1.1
+ },
+ {
+ -0.1, 1.1
+ },
+ {
+ -0.1, -0.1
+ },
+ {
+ 1.1, -0.1
+ }
+ },
+ {
+ {
+ 1.1, 1.1
+ },
+ {
+ -0.1, 1.1
+ },
+ {
+ -0.1, -0.1
+ },
+ {
+ 1.1, -0.1
+ }
+ },
+ {
+ {
+ 1.1, 1.1
+ },
+ {
+ -0.1, 1.1
+ },
+ {
+ -0.1, -0.1
+ },
+ {
+ 1.1, -0.1
+ }
+ },
+};
+
+static void BuildCube(void)
+{
+ GLint i;
+
+ glNewList(cube, GL_COMPILE);
+ for (i = 0; i < 6; i++) {
+ glBegin(GL_POLYGON);
+ glNormal3fv(n[i]); glTexCoord2fv(t[i][0]); glVertex3fv(c[i][0]);
+ glNormal3fv(n[i]); glTexCoord2fv(t[i][1]); glVertex3fv(c[i][1]);
+ glNormal3fv(n[i]); glTexCoord2fv(t[i][2]); glVertex3fv(c[i][2]);
+ glNormal3fv(n[i]); glTexCoord2fv(t[i][3]); glVertex3fv(c[i][3]);
+ glEnd();
+ }
+ glEndList();
+}
+
+static void BuildLists(void)
+{
+
+ cube = glGenLists(1);
+ BuildCube();
+}
+
+static void Init(void)
+{
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image->sizeX, image->sizeY,
+ GL_RGB, GL_UNSIGNED_BYTE, image->data);
+ glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal);
+ glEnable(GL_TEXTURE_2D);
+
+ glFrontFace(GL_CCW);
+ glCullFace(GL_FRONT);
+ glEnable(GL_CULL_FACE);
+
+ BuildLists();
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+
+ magFilter = nr;
+ minFilter = nr;
+ sWrapMode = repeat;
+ tWrapMode = repeat;
+}
+
+static void Reshape(int width, int height)
+{
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPerspective(145.0, 1.0, 0.01, 1000);
+ glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key2(int key, int x, int y)
+{
+
+ switch (key) {
+ case GLUT_KEY_LEFT:
+ yRotation -= 0.5;
+ break;
+ case GLUT_KEY_RIGHT:
+ yRotation += 0.5;
+ break;
+ case GLUT_KEY_UP:
+ xRotation -= 0.5;
+ break;
+ case GLUT_KEY_DOWN:
+ xRotation += 0.5;
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+ switch (key) {
+ case 27:
+ exit(1);
+
+ case 'T':
+ zTranslate += 0.25;
+ break;
+ case 't':
+ zTranslate -= 0.25;
+ break;
+
+ case 's':
+ doSphere = !doSphere;
+ if (doSphere) {
+ glTexGeniv(GL_S, GL_TEXTURE_GEN_MODE, sphereMap);
+ glTexGeniv(GL_T, GL_TEXTURE_GEN_MODE, sphereMap);
+ glEnable(GL_TEXTURE_GEN_S);
+ glEnable(GL_TEXTURE_GEN_T);
+ } else {
+ glDisable(GL_TEXTURE_GEN_S);
+ glDisable(GL_TEXTURE_GEN_T);
+ }
+ break;
+
+ case '0':
+ magFilter = nr;
+ break;
+ case '1':
+ magFilter = ln;
+ break;
+ case '2':
+ minFilter = nr;
+ break;
+ case '3':
+ minFilter = ln;
+ break;
+ case '4':
+ minFilter = nr_mipmap_nr;
+ break;
+ case '5':
+ minFilter = nr_mipmap_ln;
+ break;
+ case '6':
+ minFilter = ln_mipmap_nr;
+ break;
+ case '7':
+ minFilter = ln_mipmap_ln;
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sWrapMode);
+ glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tWrapMode);
+ glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter);
+ glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);
+
+ glPushMatrix();
+
+ glTranslatef(0.0, 0.0, zTranslate);
+ glRotatef(xRotation, 1, 0, 0);
+ glRotatef(yRotation, 0, 1, 0);
+ glCallList(cube);
+
+ glPopMatrix();
+
+ glFlush();
+
+ if (doubleBuffer) {
+ glutSwapBuffers();
+ }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+ GLint i;
+
+ doubleBuffer = GL_FALSE;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-sb") == 0) {
+ doubleBuffer = GL_FALSE;
+ } else if (strcmp(argv[i], "-db") == 0) {
+ doubleBuffer = GL_TRUE;
+ } else if (strcmp(argv[i], "-f") == 0) {
+ if (i+1 >= argc || argv[i+1][0] == '-') {
+ printf("-f (No file name).\n");
+ return GL_FALSE;
+ } else {
+ texFileName = argv[++i];
+ }
+ } else {
+ printf("%s (Bad option).\n", argv[i]);
+ return GL_FALSE;
+ }
+ }
+ return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ GLenum type;
+
+ glutInit(&argc, argv);
+
+ if (Args(argc, argv) == GL_FALSE) {
+ exit(1);
+ }
+
+ if (texFileName == 0) {
+ printf("No image file.\n");
+ exit(1);
+ }
+
+ image = LoadPPM(texFileName);
+
+ glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
+
+ type = GLUT_RGB;
+ type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+ glutInitDisplayMode(type);
+
+ if (glutCreateWindow("Texture Test") == GL_FALSE) {
+ exit(1);
+ }
+
+ Init();
+
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(Key2);
+ glutDisplayFunc(Draw);
+ glutMainLoop();
+ return 0;
+}