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mesa: additional comments in format code

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This commit is contained in:
Brian Paul 2009-10-24 08:41:08 -06:00
parent 1160acbfea
commit eb732b1bbb
1 changed files with 28 additions and 1 deletions
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29
src/mesa/main/formats.c
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@ -39,7 +39,8 @@ struct gl_format_info
/** /**
* Base format is one of GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, * Base format is one of GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE,
* GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_COLOR_INDEX, GL_DEPTH_COMPONENT. * GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA, GL_COLOR_INDEX,
* GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
*/ */
GLenum BaseFormat; GLenum BaseFormat;
@ -577,6 +578,11 @@ _mesa_get_format_info(gl_format format)
} }
/**
* Return bytes needed to store a block of pixels in the given format.
* Normally, a block is 1x1 (a single pixel). But for compressed formats
* a block may be 4x4 or 8x4, etc.
*/
GLuint GLuint
_mesa_get_format_bytes(gl_format format) _mesa_get_format_bytes(gl_format format)
{ {
@ -586,6 +592,11 @@ _mesa_get_format_bytes(gl_format format)
} }
/**
* Return bits per component for the given format.
* \param format one of MESA_FORMAT_x
* \param pname the component, such as GL_RED_BITS, GL_TEXTURE_BLUE_BITS, etc.
*/
GLint GLint
_mesa_get_format_bits(gl_format format, GLenum pname) _mesa_get_format_bits(gl_format format, GLenum pname)
{ {
@ -636,6 +647,15 @@ _mesa_get_format_bits(gl_format format, GLenum pname)
} }
/**
* Return the data type (or more specifically, the data representation)
* for the given format.
* The return value will be one of:
* GL_UNSIGNED_NORMALIZED = unsigned int representing [0,1]
* GL_SIGNED_NORMALIZED = signed int representing [-1, 1]
* GL_UNSIGNED_INT = an ordinary unsigned integer
* GL_FLOAT = an ordinary float
*/
GLenum GLenum
_mesa_get_format_datatype(gl_format format) _mesa_get_format_datatype(gl_format format)
{ {
@ -644,6 +664,12 @@ _mesa_get_format_datatype(gl_format format)
} }
/**
* Return the basic format for the given type. The result will be
* one of GL_RGB, GL_RGBA, GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA,
* GL_INTENSITY, GL_YCBCR_MESA, GL_COLOR_INDEX, GL_DEPTH_COMPONENT,
* GL_STENCIL_INDEX, GL_DEPTH_STENCIL.
*/
GLenum GLenum
_mesa_get_format_base_format(gl_format format) _mesa_get_format_base_format(gl_format format)
{ {
@ -652,6 +678,7 @@ _mesa_get_format_base_format(gl_format format)
} }
/** Is the given format a compressed format? */
GLboolean GLboolean
_mesa_is_format_compressed(gl_format format) _mesa_is_format_compressed(gl_format format)
{ {