s_blend.c File Reference

software blending. More...

#include "main/glheader.h"
#include "main/context.h"
#include "main/colormac.h"
#include "main/macros.h"
#include "s_blend.h"
#include "s_context.h"
#include "s_span.h"

Go to the source code of this file.

Defines
#define	_BLENDAPI
#define	DIV255(X)   (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)
Functions
static void _BLENDAPI	blend_noop (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_replace (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_transparency_ubyte (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_transparency_ushort (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_transparency_float (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_add (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_min (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_max (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void _BLENDAPI	blend_modulate (GLcontext *ctx, GLuint n, const GLubyte mask[], GLvoid *src, const GLvoid *dst, GLenum chanType)
static void	blend_general_float (GLcontext *ctx, GLuint n, const GLubyte mask[], GLfloat rgba[][4], GLfloat dest[][4], GLenum chanType)
static void	blend_general (GLcontext *ctx, GLuint n, const GLubyte mask[], void *src, const void *dst, GLenum chanType)
void	_swrast_choose_blend_func (GLcontext *ctx, GLenum chanType)
void	_swrast_blend_span (GLcontext *ctx, struct gl_renderbuffer *rb, SWspan *span)

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Detailed Description

software blending.

Author:

Brian Paul

Only a few blend modes have been optimized (min, max, transparency, add) more optimized cases can easily be added if needed. Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.

Definition in file s_blend.c.