+++ /dev/null
-/*
- * Mesa 3-D graphics library
- * Version: 7.5
- *
- * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
- * Copyright (C) 2009 VMware, Inc. 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"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#ifndef S_SPAN_H
-#define S_SPAN_H
-
-
-#include "main/config.h"
-#include "main/glheader.h"
-#include "main/mtypes.h"
-#include "swrast/s_chan.h"
-
-
-struct gl_context;
-struct gl_renderbuffer;
-
-
-/**
- * \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_Z 0x02 /**< interpMask and arrayMask */
-#define SPAN_FLAT 0x04 /**< interpMask: flat shading? */
-#define SPAN_XY 0x08 /**< array.x[], y[] valid? */
-#define SPAN_MASK 0x10 /**< was array.mask[] filled in by caller? */
-#define SPAN_LAMBDA 0x20 /**< array.lambda[] valid? */
-#define SPAN_COVERAGE 0x40 /**< 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_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;
-
- /** for clipping left edge of spans */
- GLuint leftClip;
-
- /** This flag indicates that mask[] array is effectively filled with ones */
- GLboolean writeAll;
-
- /** either GL_POLYGON, GL_LINE, GL_POLYGON, GL_BITMAP */
- GLenum primitive;
-
- /**
- * 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;
-
- /** Mask of FRAG_BIT_x bits */
- GLbitfield64 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).leftClip = 0; \
- (S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \
-} while (0)
-
-
-
-extern void
-_swrast_span_default_attribs(struct gl_context *ctx, SWspan *span);
-
-extern void
-_swrast_span_interpolate_z( const struct gl_context *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
-_swrast_write_rgba_span( struct gl_context *ctx, SWspan *span);
-
-
-extern void
-_swrast_read_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,
- GLuint n, GLint x, GLint y, GLvoid *rgba);
-
-extern void
-_swrast_put_row(struct gl_context *ctx, struct gl_renderbuffer *rb,
- GLenum datatype,
- GLuint count, GLint x, GLint y,
- const void *values, const GLubyte *mask);
-
-extern void *
-_swrast_get_dest_rgba(struct gl_context *ctx, struct gl_renderbuffer *rb,
- SWspan *span);
-
-#endif
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