Added MesaLib-7.6

1 files changed, 226 insertions, 0 deletions

diff --git a/mesalib/src/mesa/swrast/s_span.h b/mesalib/src/mesa/swrast/s_span.h
new file mode 100644
index 000000000..0eabae20e
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+++ b/mesalib/src/mesa/swrast/s_span.h
@@ -0,0 +1,226 @@
+/*
+ * 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 "swrast.h"
+
+
+/**
+ * \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;
+
+   /** 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;
+
+   /** 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).leftClip = 0;				\
+   (S).facing = 0;				\
+   (S).array = SWRAST_CONTEXT(ctx)->SpanArrays;	\
+} while (0)
+
+
+
+extern void
+_swrast_span_default_attribs(GLcontext *ctx, SWspan *span);
+
+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
+_swrast_write_index_span( GLcontext *ctx, SWspan *span);
+
+
+extern void
+_swrast_write_rgba_span( GLcontext *ctx, SWspan *span);
+
+
+extern void
+_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
+_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 *
+_swrast_get_dest_rgba(GLcontext *ctx, struct gl_renderbuffer *rb,
+                      SWspan *span);
+
+#endif