/*
* Mesa 3-D graphics library
- * Version: 6.5
+ * Version: 7.5
*
- * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ * 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"),
#define S_SPAN_H
-#include "mtypes.h"
#include "swrast.h"
/**
* \defgroup SpanFlags
- * Bitflags used for interpMask and arrayMask fields below to indicate
- * which interpolant values and fragment arrays are in use, respectively.
+ * Special bitflags to describe span data.
*
- * XXX We should replace these flags with the FRAG_BIT_ values someday...
+ * 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 0x001
-#define SPAN_SPEC 0x002
-#define SPAN_INDEX 0x004
-#define SPAN_Z 0x008
-#define SPAN_W 0x010
-#define SPAN_FOG 0x020
-#define SPAN_TEXTURE 0x040
-#define SPAN_INT_TEXTURE 0x080
-#define SPAN_LAMBDA 0x100
-#define SPAN_COVERAGE 0x200
-#define SPAN_FLAT 0x400 /**< flat shading? */
-#define SPAN_XY 0x800
-#define SPAN_MASK 0x1000
-#define SPAN_VARYING 0x2000
+#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? */
/*@}*/
-#if 0
-/* alternate arrangement for code below */
-struct arrays2 {
- union {
- GLubyte sz1[MAX_WIDTH][4]; /* primary color */
- GLushort sz2[MAX_WIDTH][4];
- } rgba;
- union {
- GLubyte sz1[MAX_WIDTH][4]; /* specular color and temp storage */
- GLushort sz2[MAX_WIDTH][4];
- } spec;
-};
-#endif
-
-
-
/**
* \sw_span_arrays
* \brief Arrays of fragment values.
GLubyte mask[MAX_WIDTH];
GLenum ChanType; /**< Color channel type, GL_UNSIGNED_BYTE, GL_FLOAT */
- union {
- struct {
- GLubyte rgba[MAX_WIDTH][4]; /**< primary color */
- GLubyte spec[MAX_WIDTH][4]; /**< specular color and temp storage */
- } sz1;
- struct {
- GLushort rgba[MAX_WIDTH][4];
- GLushort spec[MAX_WIDTH][4];
- } sz2;
- } color;
- /** XXX these are temporary fields, pointing into above color arrays */
- GLchan (*rgba)[4];
- GLchan (*spec)[4];
+ /** 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;
/** 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;
/* For horizontal spans, step is the partial derivative wrt X.
* For lines, step is the delta from one fragment to the next.
*/
-#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; /* XXX z should probably be GLuint */
- GLfixed intTex[2], intTexStep[2]; /* s, t only */
+ 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
*/
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
-#define INIT_SPAN(S, PRIMITIVE, END, INTERP_MASK, ARRAY_MASK) \
-do { \
- (S).primitive = (PRIMITIVE); \
- (S).interpMask = (INTERP_MASK); \
- (S).arrayMask = (ARRAY_MASK); \
- (S).end = (END); \
- (S).facing = 0; \
- (S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \
+#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).facing = 0; \
+ (S).array = SWRAST_CONTEXT(ctx)->SpanArrays; \
} while (0)
extern void
-_swrast_span_default_z( GLcontext *ctx, SWspan *span );
+_swrast_span_default_attribs(GLcontext *ctx, SWspan *span);
extern void
_swrast_span_interpolate_z( const GLcontext *ctx, SWspan *span );
-extern void
-_swrast_span_default_fog( GLcontext *ctx, SWspan *span );
-
-extern void
-_swrast_span_default_color( GLcontext *ctx, SWspan *span );
-
-extern void
-_swrast_span_default_texcoords( 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
-_swrast_write_index_span( GLcontext *ctx, SWspan *span);
-
extern void
_swrast_write_rgba_span( GLcontext *ctx, SWspan *span);
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