xserver and mesa git update 28-12-2010

1 files changed, 349 insertions, 349 deletions

diff --git a/mesalib/src/mesa/swrast/s_context.h b/mesalib/src/mesa/swrast/s_context.h
index 6d81f7476..7535832ab 100644
--- a/mesalib/src/mesa/swrast/s_context.h
+++ b/mesalib/src/mesa/swrast/s_context.h
@@ -1,349 +1,349 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5.3
- *
- * Copyright (C) 1999-2007  Brian Paul   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.
- */
-
-
-/**
- * \file swrast/s_context.h
- * \brief Software rasterization context and private types.
- * \author Keith Whitwell <keith@tungstengraphics.com>
- */
-
-/**
- * \mainpage swrast module
- *
- * This module, software rasterization, contains the software fallback
- * routines for drawing points, lines, triangles, bitmaps and images.
- * All rendering boils down to writing spans (arrays) of pixels with
- * particular colors.  The span-writing routines must be implemented
- * by the device driver.
- */
-
-
-#ifndef S_CONTEXT_H
-#define S_CONTEXT_H
-
-#include "main/compiler.h"
-#include "main/mtypes.h"
-#include "program/prog_execute.h"
-#include "swrast.h"
-#include "s_span.h"
-
-
-typedef void (*texture_sample_func)(GLcontext *ctx,
-                                    const struct gl_texture_object *tObj,
-                                    GLuint n, const GLfloat texcoords[][4],
-                                    const GLfloat lambda[], GLfloat rgba[][4]);
-
-typedef void (_ASMAPIP blend_func)( GLcontext *ctx, GLuint n,
-                                    const GLubyte mask[],
-                                    GLvoid *src, const GLvoid *dst,
-                                    GLenum chanType);
-
-typedef void (*swrast_point_func)( GLcontext *ctx, const SWvertex *);
-
-typedef void (*swrast_line_func)( GLcontext *ctx,
-                                  const SWvertex *, const SWvertex *);
-
-typedef void (*swrast_tri_func)( GLcontext *ctx, const SWvertex *,
-                                 const SWvertex *, const SWvertex *);
-
-
-typedef void (*validate_texture_image_func)(GLcontext *ctx,
-                                            struct gl_texture_object *texObj,
-                                            GLuint face, GLuint level);
-
-
-/**
- * \defgroup Bitmasks
- * Bitmasks to indicate which rasterization options are enabled
- * (RasterMask)
- */
-/*@{*/
-#define ALPHATEST_BIT		0x001	/**< Alpha-test pixels */
-#define BLEND_BIT		0x002	/**< Blend pixels */
-#define DEPTH_BIT		0x004	/**< Depth-test pixels */
-#define FOG_BIT			0x008	/**< Fog pixels */
-#define LOGIC_OP_BIT		0x010	/**< Apply logic op in software */
-#define CLIP_BIT		0x020	/**< Scissor or window clip pixels */
-#define STENCIL_BIT		0x040	/**< Stencil pixels */
-#define MASKING_BIT		0x080	/**< Do glColorMask or glIndexMask */
-#define MULTI_DRAW_BIT		0x400	/**< Write to more than one color- */
-                                        /**< buffer or no buffers. */
-#define OCCLUSION_BIT           0x800   /**< GL_HP_occlusion_test enabled */
-#define TEXTURE_BIT		0x1000	/**< Texturing really enabled */
-#define FRAGPROG_BIT            0x2000  /**< Fragment program enabled */
-#define ATIFRAGSHADER_BIT       0x4000  /**< ATI Fragment shader enabled */
-#define CLAMPING_BIT            0x8000  /**< Clamp colors to [0,1] */
-/*@}*/
-
-#define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|	\
-			        _NEW_SCISSOR|	\
-			        _NEW_COLOR|	\
-			        _NEW_DEPTH|	\
-			        _NEW_FOG|	\
-                                _NEW_PROGRAM|   \
-			        _NEW_STENCIL|	\
-			        _NEW_TEXTURE|	\
-			        _NEW_VIEWPORT|	\
-			        _NEW_DEPTH)
-
-
-/**
- * \struct SWcontext
- * \brief  Per-context state that's private to the software rasterizer module.
- */
-typedef struct
-{
-   /** Driver interface:
-    */
-   struct swrast_device_driver Driver;
-
-   /** Configuration mechanisms to make software rasterizer match
-    * characteristics of the hardware rasterizer (if present):
-    */
-   GLboolean AllowVertexFog;
-   GLboolean AllowPixelFog;
-
-   /** Derived values, invalidated on statechanges, updated from
-    * _swrast_validate_derived():
-    */
-   GLbitfield _RasterMask;
-   GLfloat _BackfaceSign;      /** +1 or -1 */
-   GLfloat _BackfaceCullSign;  /** +1, 0, or -1 */
-   GLboolean _PreferPixelFog;    /* Compute fog blend factor per fragment? */
-   GLboolean _TextureCombinePrimary;
-   GLboolean _FogEnabled;
-   GLboolean _DeferredTexture;
-   GLenum _FogMode;  /* either GL_FOG_MODE or fragment program's fog mode */
-
-   /** List/array of the fragment attributes to interpolate */
-   GLuint _ActiveAttribs[FRAG_ATTRIB_MAX];
-   /** Same info, but as a bitmask */
-   GLbitfield _ActiveAttribMask;
-   /** Number of fragment attributes to interpolate */
-   GLuint _NumActiveAttribs;
-   /** Indicates how each attrib is to be interpolated (lines/tris) */
-   GLenum _InterpMode[FRAG_ATTRIB_MAX]; /* GL_FLAT or GL_SMOOTH (for now) */
-
-   /* Accum buffer temporaries.
-    */
-   GLboolean _IntegerAccumMode;	/**< Storing unscaled integers? */
-   GLfloat _IntegerAccumScaler;	/**< Implicit scale factor */
-
-   /* Working values:
-    */
-   GLuint StippleCounter;    /**< Line stipple counter */
-   GLuint PointLineFacing;
-   GLbitfield NewState;
-   GLuint StateChanges;
-   GLenum Primitive;    /* current primitive being drawn (ala glBegin) */
-   GLboolean SpecularVertexAdd; /**< Add specular/secondary color per vertex */
-
-   void (*InvalidateState)( GLcontext *ctx, GLbitfield new_state );
-
-   /**
-    * When the NewState mask intersects these masks, we invalidate the
-    * Point/Line/Triangle function pointers below.
-    */
-   /*@{*/
-   GLbitfield InvalidatePointMask;
-   GLbitfield InvalidateLineMask;
-   GLbitfield InvalidateTriangleMask;
-   /*@}*/
-
-   /**
-    * Device drivers plug in functions for these callbacks.
-    * Will be called when the GL state change mask intersects the above masks.
-    */
-   /*@{*/
-   void (*choose_point)( GLcontext * );
-   void (*choose_line)( GLcontext * );
-   void (*choose_triangle)( GLcontext * );
-   /*@}*/
-
-   /**
-    * Current point, line and triangle drawing functions.
-    */
-   /*@{*/
-   swrast_point_func Point;
-   swrast_line_func Line;
-   swrast_tri_func Triangle;
-   /*@}*/
-
-   /**
-    * Placeholders for when separate specular (or secondary color) is
-    * enabled but texturing is not.
-    */
-   /*@{*/
-   swrast_point_func SpecPoint;
-   swrast_line_func SpecLine;
-   swrast_tri_func SpecTriangle;
-   /*@}*/
-
-   /**
-    * Typically, we'll allocate a sw_span structure as a local variable
-    * and set its 'array' pointer to point to this object.  The reason is
-    * this object is big and causes problems when allocated on the stack
-    * on some systems.
-    */
-   SWspanarrays *SpanArrays;
-   SWspanarrays *ZoomedArrays;  /**< For pixel zooming */
-
-   /**
-    * Used to buffer N GL_POINTS, instead of rendering one by one.
-    */
-   SWspan PointSpan;
-
-   /** Internal hooks, kept up to date by the same mechanism as above.
-    */
-   blend_func BlendFunc;
-   texture_sample_func TextureSample[MAX_TEXTURE_IMAGE_UNITS];
-
-   /** Buffer for saving the sampled texture colors.
-    * Needed for GL_ARB_texture_env_crossbar implementation.
-    */
-   GLfloat *TexelBuffer;
-
-   validate_texture_image_func ValidateTextureImage;
-
-   /** State used during execution of fragment programs */
-   struct gl_program_machine FragProgMachine;
-
-} SWcontext;
-
-
-extern void
-_swrast_validate_derived( GLcontext *ctx );
-
-extern void
-_swrast_update_texture_samplers(GLcontext *ctx);
-
-
-/** Return SWcontext for the given GLcontext */
-static INLINE SWcontext *
-SWRAST_CONTEXT(GLcontext *ctx)
-{
-   return (SWcontext *) ctx->swrast_context;
-}
-
-/** const version of above */
-static INLINE const SWcontext *
-CONST_SWRAST_CONTEXT(const GLcontext *ctx)
-{
-   return (const SWcontext *) ctx->swrast_context;
-}
-
-
-/**
- * Called prior to framebuffer reading/writing.
- * For drivers that rely on swrast for fallback rendering, this is the
- * driver's opportunity to map renderbuffers and textures.
- */
-static INLINE void
-swrast_render_start(GLcontext *ctx)
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   if (swrast->Driver.SpanRenderStart)
-      swrast->Driver.SpanRenderStart(ctx);
-}
-
-
-/** Called after framebuffer reading/writing */
-static INLINE void
-swrast_render_finish(GLcontext *ctx)
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   if (swrast->Driver.SpanRenderFinish)
-      swrast->Driver.SpanRenderFinish(ctx);
-}
-
-
-
-/**
- * Size of an RGBA pixel, in bytes, for given datatype.
- */
-#define RGBA_PIXEL_SIZE(TYPE)                                     \
-         ((TYPE == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :      \
-          ((TYPE == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)     \
-           : 4 * sizeof(GLfloat)))
-
-
-
-/*
- * Fixed point arithmetic macros
- */
-#ifndef FIXED_FRAC_BITS
-#define FIXED_FRAC_BITS 11
-#endif
-
-#define FIXED_SHIFT     FIXED_FRAC_BITS
-#define FIXED_ONE       (1 << FIXED_SHIFT)
-#define FIXED_HALF      (1 << (FIXED_SHIFT-1))
-#define FIXED_FRAC_MASK (FIXED_ONE - 1)
-#define FIXED_INT_MASK  (~FIXED_FRAC_MASK)
-#define FIXED_EPSILON   1
-#define FIXED_SCALE     ((float) FIXED_ONE)
-#define FIXED_DBL_SCALE ((double) FIXED_ONE)
-#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))
-#define FixedToDouble(X) ((X) * (1.0 / FIXED_DBL_SCALE))
-#define IntToFixed(I)   ((I) << FIXED_SHIFT)
-#define FixedToInt(X)   ((X) >> FIXED_SHIFT)
-#define FixedToUns(X)   (((unsigned int)(X)) >> FIXED_SHIFT)
-#define FixedCeil(X)    (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)
-#define FixedFloor(X)   ((X) & FIXED_INT_MASK)
-#define FixedToFloat(X) ((X) * (1.0F / FIXED_SCALE))
-#define PosFloatToFixed(X)      FloatToFixed(X)
-#define SignedFloatToFixed(X)   FloatToFixed(X)
-
-
-
-/*
- * XXX these macros are just bandages for now in order to make
- * CHAN_BITS==32 compile cleanly.
- * These should probably go elsewhere at some point.
- */
-#if CHAN_TYPE == GL_FLOAT
-#define ChanToFixed(X)  (X)
-#define FixedToChan(X)  (X)
-#else
-#define ChanToFixed(X)  IntToFixed(X)
-#define FixedToChan(X)  FixedToInt(X)
-#endif
-
-
-/**
- * For looping over fragment attributes in the pointe, line
- * triangle rasterizers.
- */
-#define ATTRIB_LOOP_BEGIN                                \
-   {                                                     \
-      GLuint a;                                          \
-      for (a = 0; a < swrast->_NumActiveAttribs; a++) {  \
-         const GLuint attr = swrast->_ActiveAttribs[a];
-
-#define ATTRIB_LOOP_END } }
-
-
-
-#endif
+/*

+ * Mesa 3-D graphics library

+ * Version:  6.5.3

+ *

+ * Copyright (C) 1999-2007  Brian Paul   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.

+ */

+

+

+/**

+ * \file swrast/s_context.h

+ * \brief Software rasterization context and private types.

+ * \author Keith Whitwell <keith@tungstengraphics.com>

+ */

+

+/**

+ * \mainpage swrast module

+ *

+ * This module, software rasterization, contains the software fallback

+ * routines for drawing points, lines, triangles, bitmaps and images.

+ * All rendering boils down to writing spans (arrays) of pixels with

+ * particular colors.  The span-writing routines must be implemented

+ * by the device driver.

+ */

+

+

+#ifndef S_CONTEXT_H

+#define S_CONTEXT_H

+

+#include "main/compiler.h"

+#include "main/mtypes.h"

+#include "program/prog_execute.h"

+#include "swrast.h"

+#include "s_span.h"

+

+

+typedef void (*texture_sample_func)(struct gl_context *ctx,

+                                    const struct gl_texture_object *tObj,

+                                    GLuint n, const GLfloat texcoords[][4],

+                                    const GLfloat lambda[], GLfloat rgba[][4]);

+

+typedef void (_ASMAPIP blend_func)( struct gl_context *ctx, GLuint n,

+                                    const GLubyte mask[],

+                                    GLvoid *src, const GLvoid *dst,

+                                    GLenum chanType);

+

+typedef void (*swrast_point_func)( struct gl_context *ctx, const SWvertex *);

+

+typedef void (*swrast_line_func)( struct gl_context *ctx,

+                                  const SWvertex *, const SWvertex *);

+

+typedef void (*swrast_tri_func)( struct gl_context *ctx, const SWvertex *,

+                                 const SWvertex *, const SWvertex *);

+

+

+typedef void (*validate_texture_image_func)(struct gl_context *ctx,

+                                            struct gl_texture_object *texObj,

+                                            GLuint face, GLuint level);

+

+

+/**

+ * \defgroup Bitmasks

+ * Bitmasks to indicate which rasterization options are enabled

+ * (RasterMask)

+ */

+/*@{*/

+#define ALPHATEST_BIT		0x001	/**< Alpha-test pixels */

+#define BLEND_BIT		0x002	/**< Blend pixels */

+#define DEPTH_BIT		0x004	/**< Depth-test pixels */

+#define FOG_BIT			0x008	/**< Fog pixels */

+#define LOGIC_OP_BIT		0x010	/**< Apply logic op in software */

+#define CLIP_BIT		0x020	/**< Scissor or window clip pixels */

+#define STENCIL_BIT		0x040	/**< Stencil pixels */

+#define MASKING_BIT		0x080	/**< Do glColorMask or glIndexMask */

+#define MULTI_DRAW_BIT		0x400	/**< Write to more than one color- */

+                                        /**< buffer or no buffers. */

+#define OCCLUSION_BIT           0x800   /**< GL_HP_occlusion_test enabled */

+#define TEXTURE_BIT		0x1000	/**< Texturing really enabled */

+#define FRAGPROG_BIT            0x2000  /**< Fragment program enabled */

+#define ATIFRAGSHADER_BIT       0x4000  /**< ATI Fragment shader enabled */

+#define CLAMPING_BIT            0x8000  /**< Clamp colors to [0,1] */

+/*@}*/

+

+#define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS|	\

+			        _NEW_SCISSOR|	\

+			        _NEW_COLOR|	\

+			        _NEW_DEPTH|	\

+			        _NEW_FOG|	\

+                                _NEW_PROGRAM|   \

+			        _NEW_STENCIL|	\

+			        _NEW_TEXTURE|	\

+			        _NEW_VIEWPORT|	\

+			        _NEW_DEPTH)

+

+

+/**

+ * \struct SWcontext

+ * \brief  Per-context state that's private to the software rasterizer module.

+ */

+typedef struct

+{

+   /** Driver interface:

+    */

+   struct swrast_device_driver Driver;

+

+   /** Configuration mechanisms to make software rasterizer match

+    * characteristics of the hardware rasterizer (if present):

+    */

+   GLboolean AllowVertexFog;

+   GLboolean AllowPixelFog;

+

+   /** Derived values, invalidated on statechanges, updated from

+    * _swrast_validate_derived():

+    */

+   GLbitfield _RasterMask;

+   GLfloat _BackfaceSign;      /** +1 or -1 */

+   GLfloat _BackfaceCullSign;  /** +1, 0, or -1 */

+   GLboolean _PreferPixelFog;    /* Compute fog blend factor per fragment? */

+   GLboolean _TextureCombinePrimary;

+   GLboolean _FogEnabled;

+   GLboolean _DeferredTexture;

+   GLenum _FogMode;  /* either GL_FOG_MODE or fragment program's fog mode */

+

+   /** List/array of the fragment attributes to interpolate */

+   GLuint _ActiveAttribs[FRAG_ATTRIB_MAX];

+   /** Same info, but as a bitmask */

+   GLbitfield _ActiveAttribMask;

+   /** Number of fragment attributes to interpolate */

+   GLuint _NumActiveAttribs;

+   /** Indicates how each attrib is to be interpolated (lines/tris) */

+   GLenum _InterpMode[FRAG_ATTRIB_MAX]; /* GL_FLAT or GL_SMOOTH (for now) */

+

+   /* Accum buffer temporaries.

+    */

+   GLboolean _IntegerAccumMode;	/**< Storing unscaled integers? */

+   GLfloat _IntegerAccumScaler;	/**< Implicit scale factor */

+

+   /* Working values:

+    */

+   GLuint StippleCounter;    /**< Line stipple counter */

+   GLuint PointLineFacing;

+   GLbitfield NewState;

+   GLuint StateChanges;

+   GLenum Primitive;    /* current primitive being drawn (ala glBegin) */

+   GLboolean SpecularVertexAdd; /**< Add specular/secondary color per vertex */

+

+   void (*InvalidateState)( struct gl_context *ctx, GLbitfield new_state );

+

+   /**

+    * When the NewState mask intersects these masks, we invalidate the

+    * Point/Line/Triangle function pointers below.

+    */

+   /*@{*/

+   GLbitfield InvalidatePointMask;

+   GLbitfield InvalidateLineMask;

+   GLbitfield InvalidateTriangleMask;

+   /*@}*/

+

+   /**

+    * Device drivers plug in functions for these callbacks.

+    * Will be called when the GL state change mask intersects the above masks.

+    */

+   /*@{*/

+   void (*choose_point)( struct gl_context * );

+   void (*choose_line)( struct gl_context * );

+   void (*choose_triangle)( struct gl_context * );

+   /*@}*/

+

+   /**

+    * Current point, line and triangle drawing functions.

+    */

+   /*@{*/

+   swrast_point_func Point;

+   swrast_line_func Line;

+   swrast_tri_func Triangle;

+   /*@}*/

+

+   /**

+    * Placeholders for when separate specular (or secondary color) is

+    * enabled but texturing is not.

+    */

+   /*@{*/

+   swrast_point_func SpecPoint;

+   swrast_line_func SpecLine;

+   swrast_tri_func SpecTriangle;

+   /*@}*/

+

+   /**

+    * Typically, we'll allocate a sw_span structure as a local variable

+    * and set its 'array' pointer to point to this object.  The reason is

+    * this object is big and causes problems when allocated on the stack

+    * on some systems.

+    */

+   SWspanarrays *SpanArrays;

+   SWspanarrays *ZoomedArrays;  /**< For pixel zooming */

+

+   /**

+    * Used to buffer N GL_POINTS, instead of rendering one by one.

+    */

+   SWspan PointSpan;

+

+   /** Internal hooks, kept up to date by the same mechanism as above.

+    */

+   blend_func BlendFunc;

+   texture_sample_func TextureSample[MAX_TEXTURE_IMAGE_UNITS];

+

+   /** Buffer for saving the sampled texture colors.

+    * Needed for GL_ARB_texture_env_crossbar implementation.

+    */

+   GLfloat *TexelBuffer;

+

+   validate_texture_image_func ValidateTextureImage;

+

+   /** State used during execution of fragment programs */

+   struct gl_program_machine FragProgMachine;

+

+} SWcontext;

+

+

+extern void

+_swrast_validate_derived( struct gl_context *ctx );

+

+extern void

+_swrast_update_texture_samplers(struct gl_context *ctx);

+

+

+/** Return SWcontext for the given struct gl_context */

+static INLINE SWcontext *

+SWRAST_CONTEXT(struct gl_context *ctx)

+{

+   return (SWcontext *) ctx->swrast_context;

+}

+

+/** const version of above */

+static INLINE const SWcontext *

+CONST_SWRAST_CONTEXT(const struct gl_context *ctx)

+{

+   return (const SWcontext *) ctx->swrast_context;

+}

+

+

+/**

+ * Called prior to framebuffer reading/writing.

+ * For drivers that rely on swrast for fallback rendering, this is the

+ * driver's opportunity to map renderbuffers and textures.

+ */

+static INLINE void

+swrast_render_start(struct gl_context *ctx)

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   if (swrast->Driver.SpanRenderStart)

+      swrast->Driver.SpanRenderStart(ctx);

+}

+

+

+/** Called after framebuffer reading/writing */

+static INLINE void

+swrast_render_finish(struct gl_context *ctx)

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   if (swrast->Driver.SpanRenderFinish)

+      swrast->Driver.SpanRenderFinish(ctx);

+}

+

+

+

+/**

+ * Size of an RGBA pixel, in bytes, for given datatype.

+ */

+#define RGBA_PIXEL_SIZE(TYPE)                                     \

+         ((TYPE == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :      \

+          ((TYPE == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)     \

+           : 4 * sizeof(GLfloat)))

+

+

+

+/*

+ * Fixed point arithmetic macros

+ */

+#ifndef FIXED_FRAC_BITS

+#define FIXED_FRAC_BITS 11

+#endif

+

+#define FIXED_SHIFT     FIXED_FRAC_BITS

+#define FIXED_ONE       (1 << FIXED_SHIFT)

+#define FIXED_HALF      (1 << (FIXED_SHIFT-1))

+#define FIXED_FRAC_MASK (FIXED_ONE - 1)

+#define FIXED_INT_MASK  (~FIXED_FRAC_MASK)

+#define FIXED_EPSILON   1

+#define FIXED_SCALE     ((float) FIXED_ONE)

+#define FIXED_DBL_SCALE ((double) FIXED_ONE)

+#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))

+#define FixedToDouble(X) ((X) * (1.0 / FIXED_DBL_SCALE))

+#define IntToFixed(I)   ((I) << FIXED_SHIFT)

+#define FixedToInt(X)   ((X) >> FIXED_SHIFT)

+#define FixedToUns(X)   (((unsigned int)(X)) >> FIXED_SHIFT)

+#define FixedCeil(X)    (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)

+#define FixedFloor(X)   ((X) & FIXED_INT_MASK)

+#define FixedToFloat(X) ((X) * (1.0F / FIXED_SCALE))

+#define PosFloatToFixed(X)      FloatToFixed(X)

+#define SignedFloatToFixed(X)   FloatToFixed(X)

+

+

+

+/*

+ * XXX these macros are just bandages for now in order to make

+ * CHAN_BITS==32 compile cleanly.

+ * These should probably go elsewhere at some point.

+ */

+#if CHAN_TYPE == GL_FLOAT

+#define ChanToFixed(X)  (X)

+#define FixedToChan(X)  (X)

+#else

+#define ChanToFixed(X)  IntToFixed(X)

+#define FixedToChan(X)  FixedToInt(X)

+#endif

+

+

+/**

+ * For looping over fragment attributes in the pointe, line

+ * triangle rasterizers.

+ */

+#define ATTRIB_LOOP_BEGIN                                \

+   {                                                     \

+      GLuint a;                                          \

+      for (a = 0; a < swrast->_NumActiveAttribs; a++) {  \

+         const GLuint attr = swrast->_ActiveAttribs[a];

+

+#define ATTRIB_LOOP_END } }

+

+

+

+#endif