-/**
- * \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.
- * These arrays are separated out of sw_span to conserve memory.
- */
-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;
-};
-