David _ wrote:
Hi
i´ve created an osg::image and i want to call the method allocateImage
to allocate memory for the image data
void allocateImage
<http://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a01233.html#a12>
(int s, int t, int r, GLenum pixelFormat, GLenum type, int packing=1)
my problem is that i can´t find a list of valid GLenum pixelFormat
values and the same for GLenum type
in the osg::image header file i can see this macros declared at the
beginning
These are just copies of the ones defined by the OpenGL headers.
#define GL_BGR 0x80E0
#define GL_BGRA 0x80E1
#define GL_UNSIGNED_BYTE_3_3_2 0x8032
#define GL_UNSIGNED_BYTE_2_3_3_REV 0x8362
#define GL_UNSIGNED_SHORT_5_6_5 0x8363
#define GL_UNSIGNED_SHORT_5_6_5_REV 0x8364
#define GL_UNSIGNED_SHORT_4_4_4_4 0x8033
#define GL_UNSIGNED_SHORT_4_4_4_4_REV 0x8365
#define GL_UNSIGNED_SHORT_5_5_5_1 0x8034
#define GL_UNSIGNED_SHORT_1_5_5_5_REV 0x8366
#define GL_UNSIGNED_INT_8_8_8_8 0x8035
#define GL_UNSIGNED_INT_8_8_8_8_REV 0x8367
#define GL_UNSIGNED_INT_10_10_10_2 0x8036
#define GL_UNSIGNED_INT_2_10_10_10_REV 0x8368
i want to create RGBA, RGB and Alpha (1byte per pixel) images and
don´t know which parameters to use
i guess that the pixel format is GL_BGR and GL_BGRA for the first two
ones, but no idea of how to declare a just alpha image
what is the GLenum type parameter???
From my /usr/include/GL/gl.h
/* PixelFormat */
#define GL_COLOR_INDEX 0x1900
#define GL_STENCIL_INDEX 0x1901
#define GL_DEPTH_COMPONENT 0x1902
#define GL_RED 0x1903
#define GL_GREEN 0x1904
#define GL_BLUE 0x1905
#define GL_ALPHA 0x1906
#define GL_RGB 0x1907
#define GL_RGBA 0x1908
#define GL_LUMINANCE 0x1909
#define GL_LUMINANCE_ALPHA 0x190A
/* PixelType */
#define GL_BITMAP 0x1A00
/* GL_BYTE */
/* GL_UNSIGNED_BYTE */
/* GL_SHORT */
/* GL_UNSIGNED_SHORT */
/* GL_INT */
/* GL_UNSIGNED_INT */
/* GL_FLOAT */
/* GL_UNSIGNED_BYTE_3_3_2_EXT */
/* GL_UNSIGNED_SHORT_4_4_4_4_EXT */
/* GL_UNSIGNED_SHORT_5_5_5_1_EXT */
/* GL_UNSIGNED_INT_8_8_8_8_EXT */
/* GL_UNSIGNED_INT_10_10_10_2_EXT */
At least, I think these are the right ones :)
The defined like GL_BYTE, etc. are commented out because they're already
defined earlier (under DataType).
Paul
PS I think you can find the official values through this
(http://opengl.org/registry/api) page. The enums are defined in
http://opengl.org/registry/api/enum.spec, but it's a bit hard to digest.
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