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Introduced new gluScaleImage function that uses a PixelStorageModes structure to pass in details on image packing,

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rather than relying upon glGet's to get the values.
This commit is contained in:
Robert Osfield
2010-10-07 10:51:22 +00:00
parent 021484440c
commit 12e6a23451
6 changed files with 152 additions and 134 deletions
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44
include/osg/GLU
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@@ -16,8 +16,50 @@
#include <osg/GL>
extern OSG_EXPORT GLint gluScaleImage (GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut);
/* Pixel storage modes, used by gluScaleImage */
struct OSG_EXPORT PixelStorageModes
{
// sets defaults as per glGet docs in OpenGL red book
PixelStorageModes();
// use glGet's to retrieve all the current settings
void retrieveStoreModes();
// use glGet's to retrieve all the current 3D settings
void retrieveStoreModes3D();
GLint pack_alignment;
GLint pack_row_length;
GLint pack_skip_rows;
GLint pack_skip_pixels;
GLint pack_lsb_first;
GLint pack_swap_bytes;
GLint pack_skip_images;
GLint pack_image_height;
GLint unpack_alignment;
GLint unpack_row_length;
GLint unpack_skip_rows;
GLint unpack_skip_pixels;
GLint unpack_lsb_first;
GLint unpack_swap_bytes;
GLint unpack_skip_images;
GLint unpack_image_height;
} ;
extern OSG_EXPORT const GLubyte * gluErrorString (GLenum error);
/** OSG specific gluScaleImage function that allows you to pass in the PixelStoreModes, which
* enables the code to avoid glGet's that are associated with the conventional gluScaleImage function.
* Avoiding glGet's allows this gluScaleImage function to be called at any time, from any thread, there
* is no need to have a graphics context current.*/
extern OSG_EXPORT GLint gluScaleImage (PixelStorageModes* psm, GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut);
/** Traditional GLU gluScaleImage function that sets up the PixelStoreModes automatically by doing glGets.;
* The use of glGet's means that you can only call this function from a thread with a valid graphics context.
* The use of glGet's will also result in lower performance due to the round trip to the OpenGL driver.*/
extern OSG_EXPORT GLint gluScaleImage (GLenum format, GLsizei wIn, GLsizei hIn, GLenum typeIn, const void *dataIn, GLsizei wOut, GLsizei hOut, GLenum typeOut, GLvoid* dataOut);
extern OSG_EXPORT GLint gluBuild1DMipmapLevels (GLenum target, GLint internalFormat, GLsizei width, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data);
extern OSG_EXPORT GLint gluBuild1DMipmaps (GLenum target, GLint internalFormat, GLsizei width, GLenum format, GLenum type, const void *data);
extern OSG_EXPORT GLint gluBuild2DMipmapLevels (GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLenum format, GLenum type, GLint level, GLint base, GLint max, const void *data);