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authormarha <marha@users.sourceforge.net>2011-04-27 06:58:32 +0000
committermarha <marha@users.sourceforge.net>2011-04-27 06:58:32 +0000
commit96d6df5da9cddedf4931bf8e17f96e242467c661 (patch)
tree07977c913b04e80b7dbd302e7a5890422aeacb1b /mesalib/src/mesa/swrast/s_context.h
parent71372d36e1a3f0230b88808f70d35446fda12260 (diff)
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xserver libX11 libxtrans mesa pixman xkeyboard-config git update 27 Apr 2011
Diffstat (limited to 'mesalib/src/mesa/swrast/s_context.h')
-rw-r--r--mesalib/src/mesa/swrast/s_context.h697
1 files changed, 348 insertions, 349 deletions
diff --git a/mesalib/src/mesa/swrast/s_context.h b/mesalib/src/mesa/swrast/s_context.h
index 7535832ab..8d7458c2d 100644
--- a/mesalib/src/mesa/swrast/s_context.h
+++ b/mesalib/src/mesa/swrast/s_context.h
@@ -1,349 +1,348 @@
-/*
- * 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
+/*
+ * 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;
+
+ /** 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