diff options
Diffstat (limited to 'src/mesa/swrast/swrast.h')
| -rw-r--r-- | src/mesa/swrast/swrast.h | 154 |
1 files changed, 3 insertions, 151 deletions
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h index 6113b860614..3f33dbb355e 100644 --- a/src/mesa/swrast/swrast.h +++ b/src/mesa/swrast/swrast.h @@ -1,10 +1,10 @@ -/* $Id: swrast.h,v 1.34 2003/01/14 04:55:47 brianp Exp $ */ +/* $Id: swrast.h,v 1.35 2003/02/23 04:10:54 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 5.1 * - * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2003 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -27,7 +27,7 @@ /** * \file swrast/swrast.h - * \brief Defines basic structures for sw_rasterizer. + * \brief Public interface to the software rasterization functions. * \author Keith Whitwell <[email protected]> */ @@ -75,154 +75,6 @@ typedef struct { } SWvertex; -/** - * \struct sw_span - * \brief Contains data for either a horizontal line or a set of - * pixels that are passed through a pipeline of functions before being - * drawn. - * - * The sw_span structure describes the colors, Z, fogcoord, texcoords, - * etc for either a horizontal run or a set of independent pixels. We - * can either specify a base/step to indicate interpolated values, or - * fill in arrays of values. The interpMask and arrayMask bitfields - * indicate which are active. - * - * With this structure it's easy to hand-off span rasterization to - * subroutines instead of doing it all inline in the triangle functions - * like we used to do. - * It also cleans up the local variable namespace a great deal. - * - * It would be interesting to experiment with multiprocessor rasterization - * with this structure. The triangle rasterizer could simply emit a - * stream of these structures which would be consumed by one or more - * span-processing threads which could run in parallel. - */ - - -/** - * \defgroup SpanFlags SPAN_XXX-flags - * Bitmasks to indicate which span_arrays need to be computed - * (sw_span::interpMask) or have already been filled - * (sw_span::arrayMask) - */ -/*@{*/ -#define SPAN_RGBA 0x001 -#define SPAN_SPEC 0x002 -#define SPAN_INDEX 0x004 -#define SPAN_Z 0x008 -#define SPAN_FOG 0x010 -#define SPAN_TEXTURE 0x020 -#define SPAN_INT_TEXTURE 0x040 -#define SPAN_LAMBDA 0x080 -#define SPAN_COVERAGE 0x100 -#define SPAN_FLAT 0x200 /**< flat shading? */ -/** sw_span::arrayMask only - for span_arrays::x, span_arrays::y */ -#define SPAN_XY 0x400 -#define SPAN_MASK 0x800 /**< sw_span::arrayMask only */ -/*@}*/ - - -/** - * \struct span_arrays - * \brief Arrays of fragment values. - * - * These will either be computed from the x/xStep values above or - * filled in by glDraw/CopyPixels, etc. - */ -struct span_arrays { - GLchan rgb[MAX_WIDTH][3]; - GLchan rgba[MAX_WIDTH][4]; - GLuint index[MAX_WIDTH]; - GLchan spec[MAX_WIDTH][4]; /* specular color */ - GLint x[MAX_WIDTH]; /**< X/Y used for point/line rendering only */ - GLint y[MAX_WIDTH]; /**< X/Y used for point/line rendering only */ - GLdepth z[MAX_WIDTH]; - GLfloat fog[MAX_WIDTH]; - GLfloat texcoords[MAX_TEXTURE_COORD_UNITS][MAX_WIDTH][4]; - GLfloat lambda[MAX_TEXTURE_COORD_UNITS][MAX_WIDTH]; - GLfloat coverage[MAX_WIDTH]; - - /** This mask indicates if fragment is alive or culled */ - GLubyte mask[MAX_WIDTH]; -}; - - -struct sw_span { - GLint x, y; - - /** Only need to process pixels between start <= i < end */ - /** At this time, start is always zero. */ - GLuint start, end; - - /** This flag indicates that mask[] array is effectively filled with ones */ - GLboolean writeAll; - - /** either GL_POLYGON, GL_LINE, GL_POLYGON, GL_BITMAP */ - GLenum primitive; - - /** 0 = front-facing span, 1 = back-facing span (for two-sided stencil) */ - GLuint facing; - - /** - * This bitmask (of \link SpanFlags SPAN_* flags\endlink) indicates - * which of the x/xStep variables are relevant. - */ - GLuint interpMask; - -#if CHAN_TYPE == GL_FLOAT - GLfloat red, redStep; - GLfloat green, greenStep; - GLfloat blue, blueStep; - GLfloat alpha, alphaStep; - GLfloat specRed, specRedStep; - GLfloat specGreen, specGreenStep; - GLfloat specBlue, specBlueStep; -#else /* CHAN_TYPE == GL_UNSIGNED_BYTE or GL_UNSIGNED SHORT */ - GLfixed red, redStep; - GLfixed green, greenStep; - GLfixed blue, blueStep; - GLfixed alpha, alphaStep; - GLfixed specRed, specRedStep; - GLfixed specGreen, specGreenStep; - GLfixed specBlue, specBlueStep; -#endif - GLfixed index, indexStep; - GLfixed z, zStep; - GLfloat fog, fogStep; - GLfloat tex[MAX_TEXTURE_COORD_UNITS][4]; /* s, t, r, q */ - GLfloat texStepX[MAX_TEXTURE_COORD_UNITS][4]; - GLfloat texStepY[MAX_TEXTURE_COORD_UNITS][4]; - GLfixed intTex[2], intTexStep[2]; /* s, t only */ - - /** - * This bitmask (of \link SpanFlags SPAN_* flags\endlink) indicates - * which of the fragment arrays in the span_arrays struct are relevant. - */ - GLuint arrayMask; - - /** - * We store the arrays of fragment values in a separate struct so - * that we can allocate sw_span structs on the stack without using - * a lot of memory. The span_arrays struct is about 400KB while the - * sw_span struct is only about 512 bytes. - */ - struct span_arrays *array; -}; - - -#define INIT_SPAN(S, PRIMITIVE, END, INTERP_MASK, ARRAY_MASK) \ -do { \ - (S).primitive = (PRIMITIVE); \ - (S).interpMask = (INTERP_MASK); \ - (S).arrayMask = (ARRAY_MASK); \ - (S).start = 0; \ - (S).end = (END); \ - (S).facing = 0; \ - (S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \ -} while (0) - - - struct swrast_device_driver; |