1 files changed, 204 insertions, 0 deletions
diff --git a/progs/trivial/quad-tex-sub.c b/progs/trivial/quad-tex-sub.c
new file mode 100644
index 0000000000..5620dbc6f8
--- /dev/null
+++ b/progs/trivial/quad-tex-sub.c
@@ -0,0 +1,204 @@
+/*
+ * 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 <stdlib.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+
+#define CI_OFFSET_1 16
+#define CI_OFFSET_2 32
+
+#define SIZE 16
+GLenum doubleBuffer;
+GLint line = 0;
+
+static void MakeImage()
+{
+   GLubyte tex2d[SIZE][SIZE][3];
+   GLint s, t;
+
+   for (s = 0; s < SIZE; s++) {
+      for (t = 0; t < SIZE; t++) {
+         tex2d[t][s][0] = s*255/(SIZE-1);
+         tex2d[t][s][1] = t*255/(SIZE-1);
+         tex2d[t][s][2] = 0*255/(SIZE-1);
+      }
+   }
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
+                SIZE, SIZE,
+                0,
+                GL_RGB, GL_UNSIGNED_BYTE, tex2d);
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+   glEnable(GL_TEXTURE_2D);
+}
+
+static void UpdateLine()
+{
+   GLubyte tex[SIZE][3];
+   GLubyte b = 0;
+   GLint s, t;
+
+   t = line % SIZE;
+   if (line % (SIZE * 2) < SIZE)
+      b = 255;
+   else
+      b = 0;
+
+   for (s = 0; s < SIZE; s++) {
+      tex[s][0] = s*255/(SIZE-1);
+      tex[s][1] = t*255/(SIZE-1);
+      tex[s][2] = b;
+   }
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glTexSubImage2D(GL_TEXTURE_2D, 0,
+                   0, t,
+                   SIZE, 1,
+                   GL_RGB, GL_UNSIGNED_BYTE, tex);
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+}
+
+static void Init(void)
+{
+   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+   fflush(stderr);
+
+   glClearColor(0.0, 0.0, 1.0, 0.0);
+
+   glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+   MakeImage();
+   UpdateLine();
+   line++;
+}
+
+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:
+      UpdateLine();
+      line++;
+      break;
+   }
+
+   glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glBegin(GL_QUADS);
+   glTexCoord2f(1,0);
+   glVertex3f( 0.9, -0.9, -30.0);
+   glTexCoord2f(1,1);
+   glVertex3f( 0.9,  0.9, -30.0);
+   glTexCoord2f(0,1);
+   glVertex3f(-0.9,  0.9, -30.0);
+   glTexCoord2f(0,0);
+   glVertex3f(-0.9,  -0.9, -30.0);
+   glEnd();
+
+   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 {
+         fprintf(stderr, "%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);
+   }
+
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(250, 250);
+
+   type = GLUT_RGB | GLUT_ALPHA;
+   type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+   glutInitDisplayMode(type);
+
+   if (glutCreateWindow(*argv) == GL_FALSE) {
+      exit(1);
+   }
+
+   glewInit();
+
+   Init();
+
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   glutMainLoop();
+   return 0;
+}