diff options
Diffstat (limited to 'progs/demos/readpix.c')
| -rw-r--r-- | progs/demos/readpix.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/progs/demos/readpix.c b/progs/demos/readpix.c index 32225b7961c..238ef2ee1fa 100644 --- a/progs/demos/readpix.c +++ b/progs/demos/readpix.c @@ -1,4 +1,4 @@ -/* $Id: readpix.c,v 1.3 2000/03/31 01:01:31 brianp Exp $ */ +/* $Id: readpix.c,v 1.4 2000/10/16 21:24:39 brianp Exp $ */ /* * glReadPixels and glCopyPixels test @@ -8,6 +8,9 @@ /* * $Log: readpix.c,v $ + * Revision 1.4 2000/10/16 21:24:39 brianp + * use gray background, memset TempImage to white to help with debugging + * * Revision 1.3 2000/03/31 01:01:31 brianp * tweaks to allow different read formats/types * @@ -43,11 +46,11 @@ static GLboolean ScaleAndBias = GL_FALSE; static GLboolean Benchmark = GL_FALSE; static GLubyte *TempImage = NULL; -#if 1 +#if 0 #define ReadFormat ImgFormat #define ReadType GL_UNSIGNED_BYTE #endif -#if 0 +#if 1 static GLenum ReadFormat = GL_RGBA; static GLenum ReadType = GL_UNSIGNED_BYTE; #endif @@ -55,6 +58,18 @@ static GLenum ReadType = GL_UNSIGNED_BYTE; static GLenum ReadFormat = GL_RGB; static GLenum ReadType = GL_UNSIGNED_SHORT_5_6_5; #endif +#if 0 +static GLenum ReadFormat = GL_RGBA; +static GLenum ReadType = GL_UNSIGNED_SHORT_1_5_5_5_REV; +#endif +#if 0 +static GLenum ReadFormat = GL_BGRA; +static GLenum ReadType = GL_UNSIGNED_SHORT_5_5_5_1; +#endif +#if 0 +static GLenum ReadFormat = GL_BGRA; +static GLenum ReadType = GL_UNSIGNED_SHORT_4_4_4_4_REV; +#endif static void @@ -101,6 +116,7 @@ SetupPixelTransfer(GLboolean invert) static void Display( void ) { + glClearColor(.3, .3, .3, 1); glClear( GL_COLOR_BUFFER_BIT ); glRasterPos2i(5, ImgHeight+25); @@ -137,6 +153,8 @@ Display( void ) Benchmark = GL_FALSE; } else { + /* clear the temporary image to white (helpful for debugging */ + memset(TempImage, 255, ImgWidth * ImgHeight * 4); glReadPixels(APosX, APosY, ImgWidth, ImgHeight, ReadFormat, ReadType, TempImage); } |