xm_tri.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2006  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.
 */


/*
 * This file contains "accelerated" triangle functions.  It should be
 * fairly easy to write new special-purpose triangle functions and hook
 * them into this module.
 */


#include "glxheader.h"
#include "depth.h"
#include "macros.h"
#include "imports.h"
#include "mtypes.h"
#include "xmesaP.h"

/* Internal swrast includes:
 */
#include "swrast/s_context.h"
#include "swrast/s_depth.h"
#include "swrast/s_triangle.h"


#define GET_XRB(XRB)  struct xmesa_renderbuffer *XRB = \
   xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]->Wrapped)


/**********************************************************************/
/***                   Triangle rendering                           ***/
/**********************************************************************/


#if CHAN_BITS == 8

/*
 * XImage, smooth, depth-buffered, PF_TRUECOLOR triangle.
 */
#define NAME smooth_TRUECOLOR_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define SETUP_CODE						\
   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
   GET_XRB(xrb);

#define RENDER_SPAN( span ) {					\
   GLint x = span.x, y = YFLIP(xrb, span.y);			\
   GLuint i;							\
   for (i = 0; i < span.end; i++, x++) {			\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         unsigned long p;					\
         PACK_TRUECOLOR(p, FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         XMesaPutPixel(xrb->ximage, x, y, p);			\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }

#include "swrast/s_tritemp.h"




/*
 * XImage, smooth, depth-buffered, PF_8A8B8G8R triangle.
 */
#define NAME smooth_8A8B8G8R_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define INTERP_ALPHA 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
#define PIXEL_TYPE GLuint
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = PACK_8A8B8G8R(FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue),	\
            FixedToInt(span.alpha));				\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.alpha += span.alphaStep;				\
      span.z += span.zStep;					\
   } }

#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_8A8R8G8B triangle.
 */
#define NAME smooth_8A8R8G8B_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define INTERP_ALPHA 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
#define PIXEL_TYPE GLuint
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);

#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = PACK_8A8R8G8B(FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue),	\
            FixedToInt(span.alpha));				\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.alpha += span.alphaStep;				\
      span.z += span.zStep;					\
   } }

#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_8R8G8B triangle.
 */
#define NAME smooth_8R8G8B_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
#define PIXEL_TYPE GLuint
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);

#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = PACK_8R8G8B(FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }

#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_8R8G8B24 triangle.
 */
#define NAME smooth_8R8G8B24_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y)
#define PIXEL_TYPE bgr_t
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
	 PIXEL_TYPE *ptr = pRow + i;				\
         ptr->r = FixedToInt(span.red);				\
         ptr->g = FixedToInt(span.green);			\
         ptr->b = FixedToInt(span.blue);			\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_TRUEDITHER triangle.
 */
#define NAME smooth_TRUEDITHER_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define SETUP_CODE						\
   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   GLint x = span.x, y = YFLIP(xrb, span.y);			\
   for (i = 0; i < span.end; i++, x++) {			\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         unsigned long p;					\
         PACK_TRUEDITHER(p, x, y, FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         XMesaPutPixel(xrb->ximage, x, y, p);			\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_5R6G5B triangle.
 */
#define NAME smooth_5R6G5B_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
#define PIXEL_TYPE GLushort
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = PACK_5R6G5B(FixedToInt(span.red),		\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_DITHER_5R6G5B triangle.
 */
#define NAME smooth_DITHER_5R6G5B_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
#define PIXEL_TYPE GLushort
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   GLint x = span.x, y = YFLIP(xrb, span.y);			\
   for (i = 0; i < span.end; i++, x++) {			\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         PACK_TRUEDITHER(pRow[i], x, y, FixedToInt(span.red),	\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, 8-bit, PF_DITHER8 triangle.
 */
#define NAME smooth_DITHER8_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
#define PIXEL_TYPE GLubyte
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   GLint x = span.x, y = YFLIP(xrb, span.y);			\
   XDITHER_SETUP(y);						\
   for (i = 0; i < span.end; i++, x++) {			\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = (PIXEL_TYPE) XDITHER(x, FixedToInt(span.red),\
            FixedToInt(span.green), FixedToInt(span.blue) );	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, PF_DITHER triangle.
 */
#define NAME smooth_DITHER_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define SETUP_CODE						\
   GET_XRB(xrb);						\
   XMesaImage *img = xrb->ximage;
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   GLint x = span.x, y = YFLIP(xrb, span.y);			\
   XDITHER_SETUP(y);						\
   for (i = 0; i < span.end; i++, x++) {			\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         unsigned long p = XDITHER(x, FixedToInt(span.red),	\
            FixedToInt(span.green), FixedToInt(span.blue));	\
	 XMesaPutPixel(img, x, y, p);			       	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, 8-bit PF_LOOKUP triangle.
 */
#define NAME smooth_LOOKUP8_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
#define PIXEL_TYPE GLubyte
#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
#define SETUP_CODE						\
   GET_XRB(xrb);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   LOOKUP_SETUP;						\
   for (i = 0; i < span.end; i++) {				\
      const DEPTH_TYPE z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {					\
         pRow[i] = LOOKUP(FixedToInt(span.red),			\
            FixedToInt(span.green), FixedToInt(span.blue));	\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.z += span.zStep;					\
   } }
#include "swrast/s_tritemp.h"



/*
 * XImage, smooth, depth-buffered, 8-bit PF_HPCR triangle.
 */