/* * 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" point, line, and triangle functions. * It should be fairly easy to write new special-purpose point, line or * triangle functions and hook them into this module. */ #include "glxheader.h" #include "depth.h" #include "macros.h" #include "mtypes.h" #include "xmesaP.h" /* Internal swrast includes: */ #include "swrast/s_depth.h" #include "swrast/s_points.h" #include "swrast/s_lines.h" #include "swrast/s_context.h" /**********************************************************************/ /*** Point rendering ***/ /**********************************************************************/ /* * Render an array of points into a pixmap, any pixel format. */ #if 000 /* XXX don't use this, it doesn't dither correctly */ static void draw_points_ANY_pixmap( GLcontext *ctx, const SWvertex *vert ) { XMesaContext xmesa = XMESA_CONTEXT(ctx); XMesaDisplay *dpy = xmesa->xm_visual->display; XMesaDrawable buffer = xmesa->xm_buffer->buffer; XMesaGC gc = xmesa->xm_buffer->gc; if (xmesa->xm_visual->mesa_visual.RGBAflag) { register int x, y; const GLubyte *color = vert->color; unsigned long pixel = xmesa_color_to_pixel( xmesa, color[0], color[1], color[2], color[3], xmesa->pixelformat); XMesaSetForeground( dpy, gc, pixel ); x = (GLint) vert->win[0]; y = YFLIP( xrb, (GLint) vert->win[1] ); XMesaDrawPoint( dpy, buffer, gc, x, y); } else { /* Color index mode */ register int x, y; XMesaSetForeground( dpy, gc, vert->index ); x = (GLint) vert->win[0]; y = YFLIP( xrb, (GLint) vert->win[1] ); XMesaDrawPoint( dpy, buffer, gc, x, y); } } #endif /* Override the swrast point-selection function. Try to use one of * our internal point functions, otherwise fall back to the standard * swrast functions. */ void xmesa_choose_point( GLcontext *ctx ) { #if 0 XMesaContext xmesa = XMESA_CONTEXT(ctx); SWcontext *swrast = SWRAST_CONTEXT(ctx); if (ctx->RenderMode == GL_RENDER && ctx->Point.Size == 1.0F && !ctx->Point.SmoothFlag && swrast->_RasterMask == 0 && !ctx->Texture._EnabledUnits && xmesa->xm_buffer->buffer != XIMAGE) { swrast->Point = draw_points_ANY_pixmap; } else { _swrast_choose_point( ctx ); } #else _swrast_choose_point( ctx ); #endif } /**********************************************************************/ /*** Line rendering ***/ /**********************************************************************/ #define GET_XRB(XRB) struct xmesa_renderbuffer *XRB = \ xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped) /* * Draw a flat-shaded, PF_TRUECOLOR line into an XImage. */ #define NAME flat_TRUECOLOR_line #define SETUP_CODE \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ unsigned long pixel; \ PACK_TRUECOLOR( pixel, color[0], color[1], color[2] ); #define CLIP_HACK 1 #define PLOT(X,Y) XMesaPutPixel(xrb->ximage, X, YFLIP(xrb, Y), pixel ); #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_8A8B8G8R line into an XImage. */ #define NAME flat_8A8B8G8R_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8B8G8R( color[0], color[1], color[2] ); #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = pixel; #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_8A8R8G8B line into an XImage. */ #define NAME flat_8A8R8G8B_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8R8G8B( color[0], color[1], color[2] ); #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = pixel; #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_8R8G8B line into an XImage. */ #define NAME flat_8R8G8B_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8R8G8B( color[0], color[1], color[2] ); #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = pixel; #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_8R8G8B24 line into an XImage. */ #define NAME flat_8R8G8B24_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; #define PIXEL_TYPE bgr_t #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) { \ pixelPtr->r = color[RCOMP]; \ pixelPtr->g = color[GCOMP]; \ pixelPtr->b = color[BCOMP]; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_5R6G5B line into an XImage. */ #define NAME flat_5R6G5B_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLushort pixel = PACK_5R6G5B( color[0], color[1], color[2] ); #define PIXEL_TYPE GLushort #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = pixel; #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_DITHER_5R6G5B line into an XImage. */ #define NAME flat_DITHER_5R6G5B_line #define SETUP_CODE \ GET_XRB(xrb); \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ const GLubyte *color = vert1->color; #define PIXEL_TYPE GLushort #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) PACK_TRUEDITHER( *pixelPtr, X, Y, color[0], color[1], color[2] ); #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_DITHER 8-bit line into an XImage. */ #define NAME flat_DITHER8_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLint r = color[0], g = color[1], b = color[2]; \ DITHER_SETUP; #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = DITHER(X,Y,r,g,b); #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_LOOKUP 8-bit line into an XImage. */ #define NAME flat_LOOKUP8_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLubyte pixel; \ LOOKUP_SETUP; \ pixel = (GLubyte) LOOKUP( color[0], color[1], color[2] ); #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = pixel; #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, PF_HPCR line into an XImage. */ #define NAME flat_HPCR_line #define SETUP_CODE \ GET_XRB(xrb); \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ const GLubyte *color = vert1->color; \ GLint r = color[0], g = color[1], b = color[2]; #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) *pixelPtr = (GLubyte) DITHER_HPCR(X,Y,r,g,b); #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_TRUECOLOR line into an XImage. */ #define NAME flat_TRUECOLOR_z_line #define SETUP_CODE \ GET_XRB(xrb); \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ const GLubyte *color = vert1->color; \ unsigned long pixel; \ PACK_TRUECOLOR( pixel, color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ XMesaPutPixel(xrb->ximage, X, YFLIP(xrb, Y), pixel); \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_8A8B8G8R line into an XImage. */ #define NAME flat_8A8B8G8R_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8B8G8R( color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = pixel; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_8A8R8G8B line into an XImage. */ #define NAME flat_8A8R8G8B_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8R8G8B( color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = pixel; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_8R8G8B line into an XImage. */ #define NAME flat_8R8G8B_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLuint pixel = PACK_8R8G8B( color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLuint #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = pixel; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_8R8G8B24 line into an XImage. */ #define NAME flat_8R8G8B24_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE bgr_t #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ pixelPtr->r = color[RCOMP]; \ pixelPtr->g = color[GCOMP]; \ pixelPtr->b = color[BCOMP]; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_5R6G5B line into an XImage. */ #define NAME flat_5R6G5B_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLushort pixel = PACK_5R6G5B( color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLushort #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = pixel; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_DITHER_5R6G5B line into an XImage. */ #define NAME flat_DITHER_5R6G5B_z_line #define SETUP_CODE \ GET_XRB(xrb); \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ const GLubyte *color = vert1->color; #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLushort #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ PACK_TRUEDITHER(*pixelPtr, X, Y, color[0], color[1], color[2]); \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_DITHER 8-bit line into an XImage. */ #define NAME flat_DITHER8_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLint r = color[0], g = color[1], b = color[2]; \ DITHER_SETUP; #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = (GLubyte) DITHER( X, Y, r, g, b); \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_LOOKUP 8-bit line into an XImage. */ #define NAME flat_LOOKUP8_z_line #define SETUP_CODE \ GET_XRB(xrb); \ const GLubyte *color = vert1->color; \ GLubyte pixel; \ LOOKUP_SETUP; \ pixel = (GLubyte) LOOKUP( color[0], color[1], color[2] ); #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = pixel; \ } #include "swrast/s_linetemp.h" /* * Draw a flat-shaded, Z-less, PF_HPCR line into an XImage. */ #define NAME flat_HPCR_z_line #define SETUP_CODE \ GET_XRB(xrb); \ XMesaContext xmesa = XMESA_CONTEXT(ctx); \ const GLubyte *color = vert1->color; \ GLint r = color[0], g = color[1], b = color[2]; #define INTERP_Z 1 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE #define PIXEL_TYPE GLubyte #define BYTES_PER_ROW (xrb->ximage->bytes_per_line) #define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X,Y) #define CLIP_HACK 1 #define PLOT(X,Y) \ if (Z < *zPtr) { \ *zPtr = Z; \ *pixelPtr = (GLubyte) DITHER_HPCR( X, Y, r, g, b); \ } #include "swrast/s_linetemp.h" #ifndef XFree86Server /** * Draw fast, XOR line with XDrawLine in front color buffer. * WARNING: this isn't fully OpenGL conformant because different pixels * will be hit versus using the other line functions. * Don't use the code in X server GLcore module since we need a wrapper * for the XSetLineAttributes() function call. */ static void xor_line(GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1) { XMesaContext xmesa = XMESA_CONTEXT(ctx); XMesaDisplay *dpy = xmesa->xm_visual->display; XMesaGC gc = xmesa->xm_buffer->gc; GET_XRB(xrb); unsigned long pixel = xmesa_color_to_pixel(ctx, vert1->color[0], vert1->color[1], vert1->color[2], vert1->color[3], xmesa->pixelformat); int x0 = (int) vert0->win[0]; int y0 = YFLIP(xrb, (GLint) vert0->win[1]); int x1 = (int) vert1->win[0]; int y1 = YFLIP(xrb, (GLint) vert1->win[1]); XMesaSetForeground(dpy, gc, pixel); XMesaSetFunction(dpy, gc, GXxor); XSetLineAttributes(dpy, gc, (int) ctx->Line.Width, LineSolid, CapButt, JoinMiter); XDrawLine(dpy, xrb->pixmap, gc, x0, y0, x1, y1); XMesaSetFunction(dpy, gc, GXcopy); /* this gc is used elsewhere */ } #endif /* XFree86Server */ /** * Return pointer to line drawing function, or NULL if we should use a * swrast fallback. */ static swrast_line_func get_line_func(GLcontext *ctx) { XMesaContext xmesa = XMESA_CONTEXT(ctx); SWcontext *swrast = SWRAST_CONTEXT(ctx); int depth = GET_VISUAL_DEPTH(xmesa->xm_visual); struct xmesa_renderbuffer *xrb; if ((ctx->DrawBuffer->_ColorDrawBufferMask[0] & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT)) == 0) return (swrast_line_func) NULL; if (ctx->RenderMode != GL_RENDER) return (swrast_line_func) NULL; if (ctx->Line.SmoothFlag) return (swrast_line_func) NULL; if (ctx->Texture._EnabledUnits) return (swrast_line_func) NULL; if (ctx->Light.ShadeModel != GL_FLAT) return (swrast_line_func) NULL; if (ctx->Line.StippleFlag) return (swrast_line_func) NULL; if (swrast->_RasterMask & MULTI_DRAW_BIT) return (swrast_line_func) NULL; xrb = xmesa_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]->Wrapped); if (xrb->ximage && swrast->_RasterMask==DEPTH_BIT && ctx->Depth.Func==GL_LESS && ctx->Depth.Mask==GL_TRUE && ctx->Visual.depthBits == DEFAULT_SOFTWARE_DEPTH_BITS && ctx->Line.Width==1.0F) { switch (xmesa->pixelformat) { case PF_Truecolor: return flat_TRUECOLOR_z_line; case PF_8A8B8G8R: return flat_8A8B8G8R_z_line; case PF_8A8R8G8B: return flat_8A8R8G8B_z_line; case PF_8R8G8B: return flat_8R8G8B_z_line; case PF_8R8G8B24: return flat_8R8G8B24_z_line; case PF_5R6G5B: return flat_5R6G5B_z_line; case PF_Dither_5R6G5B: return flat_DITHER_5R6G5B_z_line; case PF_Dither: return (depth==8) ? flat_DITHER8_z_line : (swrast_line_func) NULL; case PF_Lookup: return (depth==8) ? flat_LOOKUP8_z_line : (swrast_line_func) NULL; case PF_HPCR: return flat_HPCR_z_line; default: return (swrast_line_func)NULL; } } if (xrb->ximage && swrast->_RasterMask==0 && ctx->Line.Width==1.0F) { switch (xmesa->pixelformat) { case PF_Truecolor: return flat_TRUECOLOR_line; case PF_8A8B8G8R: return flat_8A8B8G8R_line; case PF_8A8R8G8B: return flat_8A8R8G8B_line; case PF_8R8G8B: return flat_8R8G8B_line; case PF_8R8G8B24: return flat_8R8G8B24_line; case PF_5R6G5B: return flat_5R6G5B_line; case PF_Dither_5R6G5B: return flat_DITHER_5R6G5B_line; case PF_Dither: return (depth==8) ? flat_DITHER8_line : (swrast_line_func) NULL; case PF_Lookup: return (depth==8) ? flat_LOOKUP8_line : (swrast_line_func) NULL; case PF_HPCR: return flat_HPCR_line; default: return (swrast_line_func)NULL; } } #ifndef XFree86Server if (ctx->DrawBuffer->_NumColorDrawBuffers[0] == 1 && ctx->DrawBuffer->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT && swrast->_RasterMask == LOGIC_OP_BIT && ctx->Color.LogicOp == GL_XOR && !ctx->Line.StippleFlag && !ctx->Line.SmoothFlag) { return xor_line; } #endif /* XFree86Server */ return (swrast_line_func) NULL; } /** * Override for the swrast line-selection function. Try to use one * of our internal line functions, otherwise fall back to the * standard swrast functions. */ void xmesa_choose_line(GLcontext *ctx) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (!(swrast->Line = get_line_func( ctx ))) _swrast_choose_line( ctx ); }