Initial revision

1 files changed, 307 insertions, 0 deletions

diff --git a/progs/demos/drawpix.c b/progs/demos/drawpix.c
new file mode 100644
index 0000000000..264df71ab4
--- /dev/null
+++ b/progs/demos/drawpix.c
@@ -0,0 +1,307 @@
+/* $Id: drawpix.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
+
+/*
+ * glDrawPixels demo/test/benchmark
+ * 
+ * Brian Paul   September 25, 1997  This file is in the public domain.
+ */
+
+/*
+ * $Log: drawpix.c,v $
+ * Revision 1.1  1999/08/19 00:55:40  jtg
+ * Initial revision
+ *
+ * Revision 3.3  1999/03/28 18:18:33  brianp
+ * minor clean-up
+ *
+ * Revision 3.2  1998/11/05 04:34:04  brianp
+ * moved image files to ../images/ directory
+ *
+ * Revision 3.1  1998/02/22 16:43:17  brianp
+ * added a few casts to silence compiler warnings
+ *
+ * Revision 3.0  1998/02/14 18:42:29  brianp
+ * initial rev
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+#include "../util/readtex.c"  /* a hack, I know */
+
+#define IMAGE_FILE "../images/girl.rgb"
+
+static int ImgWidth, ImgHeight;
+static GLenum ImgFormat;
+static GLubyte *Image = NULL;
+
+static int Xpos, Ypos;
+static int SkipPixels, SkipRows;
+static int DrawWidth, DrawHeight;
+static int Scissor = 0;
+static float Xzoom, Yzoom;
+
+
+
+static void Reset( void )
+{
+   Xpos = Ypos = 20;
+   DrawWidth = ImgWidth;
+   DrawHeight = ImgHeight;
+   SkipPixels = SkipRows = 0;
+   Scissor = 0;
+   Xzoom = Yzoom = 1.0;
+}
+
+
+static void Display( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT );
+
+#if 0
+   glRasterPos2i(Xpos, Ypos);
+#else
+   /* This allows negative raster positions: */
+   glRasterPos2i(0, 0);
+   glBitmap(0, 0, 0, 0, Xpos, Ypos, NULL);
+#endif
+
+   glPixelStorei(GL_UNPACK_SKIP_PIXELS, SkipPixels);
+   glPixelStorei(GL_UNPACK_SKIP_ROWS, SkipRows);
+
+   glPixelZoom( Xzoom, Yzoom );
+
+   if (Scissor)
+      glEnable(GL_SCISSOR_TEST);
+
+   glDrawPixels(DrawWidth, DrawHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
+
+   glDisable(GL_SCISSOR_TEST);
+
+   glutSwapBuffers();
+}
+
+
+static void Benchmark( void )
+{
+   int startTime, endTime;
+   int draws = 500;
+   double seconds, pixelsPerSecond;
+
+   printf("Benchmarking...\n");
+   /* GL set-up */
+   glPixelStorei(GL_UNPACK_SKIP_PIXELS, SkipPixels);
+   glPixelStorei(GL_UNPACK_SKIP_ROWS, SkipRows);
+   glPixelZoom( Xzoom, Yzoom );
+   if (Scissor)
+      glEnable(GL_SCISSOR_TEST);
+
+   /* Run timing test */
+   draws = 0;
+   startTime = glutGet(GLUT_ELAPSED_TIME);
+   do {
+      glDrawPixels(DrawWidth, DrawHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
+      draws++;
+      endTime = glutGet(GLUT_ELAPSED_TIME);
+   } while (endTime - startTime < 4000);   /* 4 seconds */
+
+   /* GL clean-up */
+   glDisable(GL_SCISSOR_TEST);
+
+   /* Results */
+   seconds = (double) (endTime - startTime) / 1000.0;
+   pixelsPerSecond = draws * DrawWidth * DrawHeight / seconds;
+   printf("Result:  %d draws in %f seconds = %f pixels/sec\n",
+          draws, seconds, pixelsPerSecond);
+}
+
+
+static void Reshape( int width, int height )
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glOrtho( 0.0, width, 0.0, height, -1.0, 1.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+
+   glScissor(width/4, height/4, width/2, height/2);
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case ' ':
+         Reset();
+         break;
+      case 'w':
+         if (DrawWidth > 0)
+            DrawWidth--;
+         break;
+      case 'W':
+         DrawWidth++;
+         break;
+      case 'h':
+         if (DrawHeight > 0)
+            DrawHeight--;
+         break;
+      case 'H':
+         DrawHeight++;
+         break;
+      case 'p':
+         if (SkipPixels > 0)
+             SkipPixels--;
+         break;
+      case 'P':
+         SkipPixels++;
+         break;
+      case 'r':
+         if (SkipRows > 0)
+             SkipRows--;
+         break;
+      case 'R':
+         SkipRows++;
+         break;
+      case 's':
+         Scissor = !Scissor;
+         break;
+      case 'x':
+         Xzoom -= 0.1;
+         break;
+      case 'X':
+         Xzoom += 0.1;
+         break;
+      case 'y':
+         Yzoom -= 0.1;
+         break;
+      case 'Y':
+         Yzoom += 0.1;
+         break;
+      case 'b':
+         Benchmark();
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void SpecialKey( int key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         Ypos += 1;
+         break;
+      case GLUT_KEY_DOWN:
+         Ypos -= 1;
+         break;
+      case GLUT_KEY_LEFT:
+         Xpos -= 1;
+         break;
+      case GLUT_KEY_RIGHT:
+         Xpos += 1;
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( GLboolean ciMode )
+{
+   printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
+   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+   Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
+   if (!Image) {
+      printf("Couldn't read %s\n", IMAGE_FILE);
+      exit(0);
+   }
+
+   if (ciMode) {
+      /* Convert RGB image to grayscale */
+      GLubyte *indexImage = malloc( ImgWidth * ImgHeight );
+      GLint i;
+      for (i=0; i<ImgWidth*ImgHeight; i++) {
+         int gray = Image[i*3] + Image[i*3+1] + Image[i*3+2];
+         indexImage[i] = gray / 3;
+      }
+      free(Image);
+      Image = indexImage;
+      ImgFormat = GL_COLOR_INDEX;
+
+      for (i=0;i<255;i++) {
+         float g = i / 255.0;
+         glutSetColor(i, g, g, g);
+      }
+   }
+
+   printf("Loaded %d by %d image\n", ImgWidth, ImgHeight );
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth);
+
+   Reset();
+}
+
+
+static void Usage(void)
+{
+   printf("Keys:\n");
+   printf("       SPACE  Reset\n");
+   printf("     Up/Down  Move image up/down\n");
+   printf("  Left/Right  Move image left/right\n");
+   printf("           w  Decrease glDrawPixels width\n");
+   printf("           W  Increase glDrawPixels width\n");
+   printf("           h  Decrease glDrawPixels height\n");
+   printf("           H  Increase glDrawPixels height\n");
+   printf("           p  Decrease GL_UNPACK_SKIP_PIXELS\n");
+   printf("           P  Increase GL_UNPACK_SKIP_PIXELS\n");
+   printf("           r  Decrease GL_UNPACK_SKIP_ROWS\n");
+   printf("           R  Increase GL_UNPACK_SKIP_ROWS\n");
+   printf("           s  Toggle GL_SCISSOR_TEST\n");
+   printf("           b  Benchmark test\n");
+   printf("         ESC  Exit\n");
+}
+
+
+int main( int argc, char *argv[] )
+{
+   GLboolean ciMode = GL_FALSE;
+
+   if (argc > 1 && strcmp(argv[1], "-ci")==0) {
+      ciMode = GL_TRUE;
+   }
+
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 500, 400 );
+
+   if (ciMode)
+      glutInitDisplayMode( GLUT_INDEX | GLUT_DOUBLE );
+   else
+      glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+
+   glutCreateWindow(argv[0]);
+
+   Init(ciMode);
+   Usage();
+
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutSpecialFunc( SpecialKey );
+   glutDisplayFunc( Display );
+
+   glutMainLoop();
+   return 0;
+}