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213 lines
7 KiB
C
213 lines
7 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.5
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef S_SPAN_H
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#define S_SPAN_H
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#include "main/config.h"
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#include "main/glheader.h"
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#include "main/mtypes.h"
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#include "swrast/s_chan.h"
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struct gl_context;
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struct gl_renderbuffer;
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/**
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* \defgroup SpanFlags
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* Special bitflags to describe span data.
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*
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* In general, the point/line/triangle functions interpolate/emit the
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* attributes specified by swrast->_ActiveAttribs (i.e. FRAT_BIT_* values).
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* Some things don't fit into that, though, so we have these flags.
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*/
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/*@{*/
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#define SPAN_RGBA 0x01 /**< interpMask and arrayMask */
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#define SPAN_Z 0x02 /**< interpMask and arrayMask */
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#define SPAN_FLAT 0x04 /**< interpMask: flat shading? */
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#define SPAN_XY 0x08 /**< array.x[], y[] valid? */
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#define SPAN_MASK 0x10 /**< was array.mask[] filled in by caller? */
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#define SPAN_LAMBDA 0x20 /**< array.lambda[] valid? */
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#define SPAN_COVERAGE 0x40 /**< array.coverage[] valid? */
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/*@}*/
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/**
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* \sw_span_arrays
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* \brief Arrays of fragment values.
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*
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* These will either be computed from the span x/xStep values or
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* filled in by glDraw/CopyPixels, etc.
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* These arrays are separated out of sw_span to conserve memory.
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*/
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typedef struct sw_span_arrays
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{
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/** Per-fragment attributes (indexed by FRAG_ATTRIB_* tokens) */
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/* XXX someday look at transposing first two indexes for better memory
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* access pattern.
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*/
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GLfloat attribs[FRAG_ATTRIB_MAX][MAX_WIDTH][4];
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/** This mask indicates which fragments are alive or culled */
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GLubyte mask[MAX_WIDTH];
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GLenum ChanType; /**< Color channel type, GL_UNSIGNED_BYTE, GL_FLOAT */
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/** Attribute arrays that don't fit into attribs[] array above */
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/*@{*/
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GLubyte rgba8[MAX_WIDTH][4];
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GLushort rgba16[MAX_WIDTH][4];
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GLchan (*rgba)[4]; /** either == rgba8 or rgba16 */
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GLint x[MAX_WIDTH]; /**< fragment X coords */
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GLint y[MAX_WIDTH]; /**< fragment Y coords */
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GLuint z[MAX_WIDTH]; /**< fragment Z coords */
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GLuint index[MAX_WIDTH]; /**< Color indexes */
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GLfloat lambda[MAX_WIDTH]; /**< Texture LOD */
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GLfloat coverage[MAX_WIDTH]; /**< Fragment coverage for AA/smoothing */
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/*@}*/
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} SWspanarrays;
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/**
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* The SWspan structure describes the colors, Z, fogcoord, texcoords,
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* etc for either a horizontal run or an array of independent pixels.
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* We can either specify a base/step to indicate interpolated values, or
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* fill in explicit arrays of values. The interpMask and arrayMask bitfields
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* indicate which attributes are active interpolants or arrays, respectively.
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*
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* It would be interesting to experiment with multiprocessor rasterization
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* with this structure. The triangle rasterizer could simply emit a
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* stream of these structures which would be consumed by one or more
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* span-processing threads which could run in parallel.
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*/
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typedef struct sw_span
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{
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/** Coord of first fragment in horizontal span/run */
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GLint x, y;
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/** Number of fragments in the span */
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GLuint end;
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/** for clipping left edge of spans */
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GLuint leftClip;
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/** This flag indicates that mask[] array is effectively filled with ones */
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GLboolean writeAll;
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/** either GL_POLYGON, GL_LINE, GL_POLYGON, GL_BITMAP */
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GLenum primitive;
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/**
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* This bitmask (of \link SpanFlags SPAN_* flags\endlink) indicates
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* which of the attrStart/StepX/StepY variables are relevant.
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*/
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GLbitfield interpMask;
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/** Fragment attribute interpolants */
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GLfloat attrStart[FRAG_ATTRIB_MAX][4]; /**< initial value */
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GLfloat attrStepX[FRAG_ATTRIB_MAX][4]; /**< dvalue/dx */
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GLfloat attrStepY[FRAG_ATTRIB_MAX][4]; /**< dvalue/dy */
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/* XXX the rest of these will go away eventually... */
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/* For horizontal spans, step is the partial derivative wrt X.
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* For lines, step is the delta from one fragment to the next.
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*/
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GLfixed red, redStep;
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GLfixed green, greenStep;
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GLfixed blue, blueStep;
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GLfixed alpha, alphaStep;
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GLfixed index, indexStep;
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GLfixed z, zStep; /**< XXX z should probably be GLuint */
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GLfixed intTex[2], intTexStep[2]; /**< (s,t) for unit[0] only */
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/**
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* This bitmask (of \link SpanFlags SPAN_* flags\endlink) indicates
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* which of the fragment arrays in the span_arrays struct are relevant.
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*/
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GLbitfield arrayMask;
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/** Mask of FRAG_BIT_x bits */
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GLbitfield64 arrayAttribs;
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/**
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* We store the arrays of fragment values in a separate struct so
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* that we can allocate sw_span structs on the stack without using
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* a lot of memory. The span_arrays struct is about 1.4MB while the
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* sw_span struct is only about 512 bytes.
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*/
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SWspanarrays *array;
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} SWspan;
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#define INIT_SPAN(S, PRIMITIVE) \
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do { \
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(S).primitive = (PRIMITIVE); \
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(S).interpMask = 0x0; \
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(S).arrayMask = 0x0; \
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(S).arrayAttribs = 0x0; \
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(S).end = 0; \
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(S).leftClip = 0; \
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(S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \
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} while (0)
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extern void
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_swrast_span_default_attribs(struct gl_context *ctx, SWspan *span);
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extern void
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_swrast_span_interpolate_z( const struct gl_context *ctx, SWspan *span );
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extern GLfloat
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_swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy,
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GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH,
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GLfloat s, GLfloat t, GLfloat q, GLfloat invQ);
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extern void
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_swrast_write_rgba_span( struct gl_context *ctx, SWspan *span);
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extern void
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_swrast_read_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,
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GLuint n, GLint x, GLint y, GLvoid *rgba);
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extern void
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_swrast_put_row(struct gl_context *ctx, struct gl_renderbuffer *rb,
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GLenum datatype,
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GLuint count, GLint x, GLint y,
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const void *values, const GLubyte *mask);
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extern void *
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_swrast_get_dest_rgba(struct gl_context *ctx, struct gl_renderbuffer *rb,
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SWspan *span);
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#endif
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