blend.h File Reference

#include "types.h"

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Functions
void	gl_blend_span (GLcontext *ctx, GLuint n, GLint x, GLint y, GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[], GLubyte mask[])
void	gl_blend_pixels (GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[], GLubyte mask[])
void	gl_BlendFunc (GLcontext *ctx, GLenum sfactor, GLenum dfactor)

Function Documentation

gl_blend_pixels()

void gl_blend_pixels	(	GLcontext *	ctx,
		GLuint	n,
		const GLint	x[],
		const GLint	y[],
		GLubyte	red[],
		GLubyte	green[],
		GLubyte	blue[],
		GLubyte	alpha[],
		GLubyte	mask[]
	)

Definition at line 532 of file blend.c.

{
   GLubyte rdest[PB_SIZE], gdest[PB_SIZE], bdest[PB_SIZE], adest[PB_SIZE];
 
   /* Read pixels from current color buffer */
   (*ctx->Driver.ReadColorPixels)( ctx, n, x, y, rdest, gdest, bdest, adest, mask );
   if (ctx->RasterMask & ALPHABUF_BIT) {
      gl_read_alpha_pixels( ctx, n, x, y, adest, mask );
   }
 
   do_blend( ctx, n, mask, red, green, blue, alpha, rdest, gdest, bdest, adest );
}

Referenced by gl_flush_pb().

gl_blend_span()

void gl_blend_span	(	GLcontext *	ctx,
		GLuint	n,
		GLint	x,
		GLint	y,
		GLubyte	red[],
		GLubyte	green[],
		GLubyte	blue[],
		GLubyte	alpha[],
		GLubyte	mask[]
	)

Definition at line 507 of file blend.c.

{
   GLubyte rdest[MAX_WIDTH], gdest[MAX_WIDTH];
   GLubyte bdest[MAX_WIDTH], adest[MAX_WIDTH];
 
   /* Read span of current frame buffer pixels */
   gl_read_color_span( ctx, n, x, y, rdest, gdest, bdest, adest );
 
   do_blend( ctx, n, mask, red, green, blue, alpha, rdest, gdest, bdest, adest );
}

Referenced by gl_write_color_span(), gl_write_monocolor_span(), and gl_write_texture_span().

gl_BlendFunc()

void gl_BlendFunc	(	GLcontext *	ctx,
		GLenum	sfactor,
		GLenum	dfactor
	)

Definition at line 76 of file blend.c.

{
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glBlendFunc" );
      return;
   }
 
   switch (sfactor) {
      case GL_ZERO:
      case GL_ONE:
      case GL_DST_COLOR:
      case GL_ONE_MINUS_DST_COLOR:
      case GL_SRC_ALPHA:
      case GL_ONE_MINUS_SRC_ALPHA:
      case GL_DST_ALPHA:
      case GL_ONE_MINUS_DST_ALPHA:
      case GL_SRC_ALPHA_SATURATE:
         ctx->Color.BlendSrc = sfactor;
         break;
      default:
         gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(sfactor)" );
         return;
   }
 
   switch (dfactor) {
      case GL_ZERO:
      case GL_ONE:
      case GL_SRC_COLOR:
      case GL_ONE_MINUS_SRC_COLOR:
      case GL_SRC_ALPHA:
      case GL_ONE_MINUS_SRC_ALPHA:
      case GL_DST_ALPHA:
      case GL_ONE_MINUS_DST_ALPHA:
         ctx->Color.BlendDst = dfactor;
         break;
      default:
         gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
   }
 
   ctx->NewState |= NEW_RASTER_OPS;
}

Referenced by execute_list(), and init_exec_pointers().