X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fswrast%2Fs_span.h;h=c4b47df58fff21d40b2075a2ced9299b51ce77b6;hb=8fb727548a652c47d8cf9593e2ae412ef2040119;hp=eb866d66ff62441e35eb3654c8537e61abc4b86a;hpb=5e3bc0c2a2bcdf59949410f94c9b705fc1281ce8;p=mesa.git diff --git a/src/mesa/swrast/s_span.h b/src/mesa/swrast/s_span.h index eb866d66ff6..c4b47df58ff 100644 --- a/src/mesa/swrast/s_span.h +++ b/src/mesa/swrast/s_span.h @@ -1,10 +1,8 @@ -/* $Id: s_span.h,v 1.2 2000/11/22 07:32:18 joukj Exp $ */ - /* * Mesa 3-D graphics library - * Version: 3.5 + * Version: 6.5 * - * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. + * Copyright (C) 1999-2005 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"), @@ -25,75 +23,199 @@ */ - - - #ifndef S_SPAN_H #define S_SPAN_H -#include "mtypes.h" #include "swrast.h" -extern void gl_write_index_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, const GLdepth z[], - const GLfixed fog[], - GLuint index[], GLenum primitive ); +/** + * \defgroup SpanFlags + * Special bitflags to describe span data. + * + * In general, the point/line/triangle functions interpolate/emit the + * attributes specified by swrast->_ActiveAttribs (i.e. FRAT_BIT_* values). + * Some things don't fit into that, though, so we have these flags. + */ +/*@{*/ +#define SPAN_RGBA 0x01 /**< interpMask and arrayMask */ +#define SPAN_INDEX 0x02 /**< interpMask and arrayMask */ +#define SPAN_Z 0x04 /**< interpMask and arrayMask */ +#define SPAN_FLAT 0x08 /**< interpMask: flat shading? */ +#define SPAN_XY 0x10 /**< array.x[], y[] valid? */ +#define SPAN_MASK 0x20 /**< was array.mask[] filled in by caller? */ +#define SPAN_LAMBDA 0x40 /**< array.lambda[] valid? */ +#define SPAN_COVERAGE 0x80 /**< array.coverage[] valid? */ +/*@}*/ + + +/** + * \sw_span_arrays + * \brief Arrays of fragment values. + * + * These will either be computed from the span x/xStep values or + * filled in by glDraw/CopyPixels, etc. + * These arrays are separated out of sw_span to conserve memory. + */ +typedef struct sw_span_arrays +{ + /** Per-fragment attributes (indexed by FRAG_ATTRIB_* tokens) */ + /* XXX someday look at transposing first two indexes for better memory + * access pattern. + */ + GLfloat attribs[FRAG_ATTRIB_MAX][MAX_WIDTH][4]; + + /** This mask indicates which fragments are alive or culled */ + GLubyte mask[MAX_WIDTH]; + + GLenum ChanType; /**< Color channel type, GL_UNSIGNED_BYTE, GL_FLOAT */ + + /** Attribute arrays that don't fit into attribs[] array above */ + /*@{*/ + GLubyte rgba8[MAX_WIDTH][4]; + GLushort rgba16[MAX_WIDTH][4]; + GLchan (*rgba)[4]; /** either == rgba8 or rgba16 */ + GLint x[MAX_WIDTH]; /**< fragment X coords */ + GLint y[MAX_WIDTH]; /**< fragment Y coords */ + GLuint z[MAX_WIDTH]; /**< fragment Z coords */ + GLuint index[MAX_WIDTH]; /**< Color indexes */ + GLfloat lambda[MAX_TEXTURE_COORD_UNITS][MAX_WIDTH]; /**< Texture LOD */ + GLfloat coverage[MAX_WIDTH]; /**< Fragment coverage for AA/smoothing */ + /*@}*/ +} SWspanarrays; + + +/** + * The SWspan structure describes the colors, Z, fogcoord, texcoords, + * etc for either a horizontal run or an array of independent pixels. + * We can either specify a base/step to indicate interpolated values, or + * fill in explicit arrays of values. The interpMask and arrayMask bitfields + * indicate which attributes are active interpolants or arrays, respectively. + * + * 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. + */ +typedef struct sw_span +{ + /** Coord of first fragment in horizontal span/run */ + GLint x, y; + + /** Number of fragments in the span */ + GLuint 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 attrStart/StepX/StepY variables are relevant. + */ + GLbitfield interpMask; + + /** Fragment attribute interpolants */ + GLfloat attrStart[FRAG_ATTRIB_MAX][4]; /**< initial value */ + GLfloat attrStepX[FRAG_ATTRIB_MAX][4]; /**< dvalue/dx */ + GLfloat attrStepY[FRAG_ATTRIB_MAX][4]; /**< dvalue/dy */ + + /* XXX the rest of these will go away eventually... */ + + /* For horizontal spans, step is the partial derivative wrt X. + * For lines, step is the delta from one fragment to the next. + */ + GLfixed red, redStep; + GLfixed green, greenStep; + GLfixed blue, blueStep; + GLfixed alpha, alphaStep; + GLfixed index, indexStep; + GLfixed z, zStep; /**< XXX z should probably be GLuint */ + GLfixed intTex[2], intTexStep[2]; /**< (s,t) for unit[0] only */ + + /** + * This bitmask (of \link SpanFlags SPAN_* flags\endlink) indicates + * which of the fragment arrays in the span_arrays struct are relevant. + */ + GLbitfield arrayMask; + + GLbitfield arrayAttribs; + + /** + * 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 1.4MB while the + * sw_span struct is only about 512 bytes. + */ + SWspanarrays *array; +} SWspan; + + + +#define INIT_SPAN(S, PRIMITIVE) \ +do { \ + (S).primitive = (PRIMITIVE); \ + (S).interpMask = 0x0; \ + (S).arrayMask = 0x0; \ + (S).arrayAttribs = 0x0; \ + (S).end = 0; \ + (S).facing = 0; \ + (S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \ +} while (0) -extern void gl_write_monoindex_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, - const GLdepth z[], - const GLfixed fog[], - GLuint index, GLenum primitive ); +extern void +_swrast_span_default_attribs(GLcontext *ctx, SWspan *span); -extern void gl_write_rgba_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, const GLdepth z[], - const GLfixed fog[], - GLchan rgba[][4], GLenum primitive ); +extern void +_swrast_span_interpolate_z( const GLcontext *ctx, SWspan *span ); +extern GLfloat +_swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, + GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, + GLfloat s, GLfloat t, GLfloat q, GLfloat invQ); -extern void gl_write_monocolor_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, - const GLdepth z[], - const GLfixed fog[], - const GLchan color[4], - GLenum primitive ); +extern void +_swrast_write_index_span( GLcontext *ctx, SWspan *span); -extern void gl_write_texture_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, - const GLdepth z[], - const GLfixed fog[], - const GLfloat s[], const GLfloat t[], - const GLfloat u[], GLfloat lambda[], - GLchan rgba[][4], CONST GLchan spec[][4], - GLenum primitive ); +extern void +_swrast_write_rgba_span( GLcontext *ctx, SWspan *span); extern void -gl_write_multitexture_span( GLcontext *ctx, - GLuint n, GLint x, GLint y, - const GLdepth z[], - const GLfixed fog[], - CONST GLfloat s[MAX_TEXTURE_UNITS][MAX_WIDTH], - CONST GLfloat t[MAX_TEXTURE_UNITS][MAX_WIDTH], - CONST GLfloat u[MAX_TEXTURE_UNITS][MAX_WIDTH], - GLfloat lambda[MAX_TEXTURE_UNITS][MAX_WIDTH], - GLchan rgba[][4], - CONST GLchan spec[][4], - GLenum primitive ); +_swrast_read_rgba_span(GLcontext *ctx, struct gl_renderbuffer *rb, + GLuint n, GLint x, GLint y, GLenum type, GLvoid *rgba); +extern void +_swrast_read_index_span( GLcontext *ctx, struct gl_renderbuffer *rb, + GLuint n, GLint x, GLint y, GLuint indx[] ); -extern void gl_read_rgba_span( GLcontext *ctx, GLframebuffer *buffer, - GLuint n, GLint x, GLint y, - GLchan rgba[][4] ); +extern void +_swrast_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, + GLuint count, const GLint x[], const GLint y[], + void *values, GLuint valueSize); + +extern void +_swrast_put_row(GLcontext *ctx, struct gl_renderbuffer *rb, + GLuint count, GLint x, GLint y, + const GLvoid *values, GLuint valueSize); +extern void +_swrast_get_row(GLcontext *ctx, struct gl_renderbuffer *rb, + GLuint count, GLint x, GLint y, + GLvoid *values, GLuint valueSize); -extern void gl_read_index_span( GLcontext *ctx, GLframebuffer *buffer, - GLuint n, GLint x, GLint y, GLuint indx[] ); +extern void * +_swrast_get_dest_rgba(GLcontext *ctx, struct gl_renderbuffer *rb, + SWspan *span); #endif