From 807c6931fe683fd844ceec1b023232181e6aae03 Mon Sep 17 00:00:00 2001 From: marha Date: Tue, 28 Dec 2010 16:10:20 +0000 Subject: xserver and mesa git update 28-12-2010 --- mesalib/src/mesa/swrast/s_linetemp.h | 804 +++++++++++++++++------------------ 1 file changed, 402 insertions(+), 402 deletions(-) (limited to 'mesalib/src/mesa/swrast/s_linetemp.h') diff --git a/mesalib/src/mesa/swrast/s_linetemp.h b/mesalib/src/mesa/swrast/s_linetemp.h index 033431df2..bd94ca40a 100644 --- a/mesalib/src/mesa/swrast/s_linetemp.h +++ b/mesalib/src/mesa/swrast/s_linetemp.h @@ -1,402 +1,402 @@ -/* - * Mesa 3-D graphics library - * Version: 7.0 - * - * 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. - */ - - -/* - * Line Rasterizer Template - * - * This file is #include'd to generate custom line rasterizers. - * - * The following macros may be defined to indicate what auxillary information - * must be interplated along the line: - * INTERP_Z - if defined, interpolate Z values - * INTERP_ATTRIBS - if defined, interpolate attribs (texcoords, varying, etc) - * - * When one can directly address pixels in the color buffer the following - * macros can be defined and used to directly compute pixel addresses during - * rasterization (see pixelPtr): - * PIXEL_TYPE - the datatype of a pixel (GLubyte, GLushort, GLuint) - * BYTES_PER_ROW - number of bytes per row in the color buffer - * PIXEL_ADDRESS(X,Y) - returns the address of pixel at (X,Y) where - * Y==0 at bottom of screen and increases upward. - * - * Similarly, for direct depth buffer access, this type is used for depth - * buffer addressing: - * DEPTH_TYPE - either GLushort or GLuint - * - * Optionally, one may provide one-time setup code - * SETUP_CODE - code which is to be executed once per line - * - * To actually "plot" each pixel the PLOT macro must be defined... - * PLOT(X,Y) - code to plot a pixel. Example: - * if (Z < *zPtr) { - * *zPtr = Z; - * color = pack_rgb( FixedToInt(r0), FixedToInt(g0), - * FixedToInt(b0) ); - * put_pixel( X, Y, color ); - * } - * - * This code was designed for the origin to be in the lower-left corner. - * - */ - - -static void -NAME( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 ) -{ - const SWcontext *swrast = SWRAST_CONTEXT(ctx); - SWspan span; - GLuint interpFlags = 0; - GLint x0 = (GLint) vert0->attrib[FRAG_ATTRIB_WPOS][0]; - GLint x1 = (GLint) vert1->attrib[FRAG_ATTRIB_WPOS][0]; - GLint y0 = (GLint) vert0->attrib[FRAG_ATTRIB_WPOS][1]; - GLint y1 = (GLint) vert1->attrib[FRAG_ATTRIB_WPOS][1]; - GLint dx, dy; - GLint numPixels; - GLint xstep, ystep; -#if defined(DEPTH_TYPE) - const GLint depthBits = ctx->DrawBuffer->Visual.depthBits; - const GLint fixedToDepthShift = depthBits <= 16 ? FIXED_SHIFT : 0; - struct gl_renderbuffer *zrb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer; -#define FixedToDepth(F) ((F) >> fixedToDepthShift) - GLint zPtrXstep, zPtrYstep; - DEPTH_TYPE *zPtr; -#elif defined(INTERP_Z) - const GLint depthBits = ctx->DrawBuffer->Visual.depthBits; -#endif -#ifdef PIXEL_ADDRESS - PIXEL_TYPE *pixelPtr; - GLint pixelXstep, pixelYstep; -#endif - -#ifdef SETUP_CODE - SETUP_CODE -#endif - - (void) swrast; - - /* Cull primitives with malformed coordinates. - */ - { - GLfloat tmp = vert0->attrib[FRAG_ATTRIB_WPOS][0] + vert0->attrib[FRAG_ATTRIB_WPOS][1] - + vert1->attrib[FRAG_ATTRIB_WPOS][0] + vert1->attrib[FRAG_ATTRIB_WPOS][1]; - if (IS_INF_OR_NAN(tmp)) - return; - } - - /* - printf("%s():\n", __FUNCTION__); - printf(" (%f, %f, %f) -> (%f, %f, %f)\n", - vert0->attrib[FRAG_ATTRIB_WPOS][0], - vert0->attrib[FRAG_ATTRIB_WPOS][1], - vert0->attrib[FRAG_ATTRIB_WPOS][2], - vert1->attrib[FRAG_ATTRIB_WPOS][0], - vert1->attrib[FRAG_ATTRIB_WPOS][1], - vert1->attrib[FRAG_ATTRIB_WPOS][2]); - printf(" (%d, %d, %d) -> (%d, %d, %d)\n", - vert0->color[0], vert0->color[1], vert0->color[2], - vert1->color[0], vert1->color[1], vert1->color[2]); - printf(" (%d, %d, %d) -> (%d, %d, %d)\n", - vert0->specular[0], vert0->specular[1], vert0->specular[2], - vert1->specular[0], vert1->specular[1], vert1->specular[2]); - */ - -/* - * Despite being clipped to the view volume, the line's window coordinates - * may just lie outside the window bounds. That is, if the legal window - * coordinates are [0,W-1][0,H-1], it's possible for x==W and/or y==H. - * This quick and dirty code nudges the endpoints inside the window if - * necessary. - */ -#ifdef CLIP_HACK - { - GLint w = ctx->DrawBuffer->Width; - GLint h = ctx->DrawBuffer->Height; - if ((x0==w) | (x1==w)) { - if ((x0==w) & (x1==w)) - return; - x0 -= x0==w; - x1 -= x1==w; - } - if ((y0==h) | (y1==h)) { - if ((y0==h) & (y1==h)) - return; - y0 -= y0==h; - y1 -= y1==h; - } - } -#endif - - dx = x1 - x0; - dy = y1 - y0; - if (dx == 0 && dy == 0) - return; - - /* - printf("%s %d,%d %g %g %g %g %g %g %g %g\n", __FUNCTION__, dx, dy, - vert0->attrib[FRAG_ATTRIB_COL1][0], - vert0->attrib[FRAG_ATTRIB_COL1][1], - vert0->attrib[FRAG_ATTRIB_COL1][2], - vert0->attrib[FRAG_ATTRIB_COL1][3], - vert1->attrib[FRAG_ATTRIB_COL1][0], - vert1->attrib[FRAG_ATTRIB_COL1][1], - vert1->attrib[FRAG_ATTRIB_COL1][2], - vert1->attrib[FRAG_ATTRIB_COL1][3]); - */ - -#ifdef DEPTH_TYPE - zPtr = (DEPTH_TYPE *) zrb->GetPointer(ctx, zrb, x0, y0); -#endif -#ifdef PIXEL_ADDRESS - pixelPtr = (PIXEL_TYPE *) PIXEL_ADDRESS(x0,y0); -#endif - - if (dx<0) { - dx = -dx; /* make positive */ - xstep = -1; -#ifdef DEPTH_TYPE - zPtrXstep = -((GLint)sizeof(DEPTH_TYPE)); -#endif -#ifdef PIXEL_ADDRESS - pixelXstep = -((GLint)sizeof(PIXEL_TYPE)); -#endif - } - else { - xstep = 1; -#ifdef DEPTH_TYPE - zPtrXstep = ((GLint)sizeof(DEPTH_TYPE)); -#endif -#ifdef PIXEL_ADDRESS - pixelXstep = ((GLint)sizeof(PIXEL_TYPE)); -#endif - } - - if (dy<0) { - dy = -dy; /* make positive */ - ystep = -1; -#ifdef DEPTH_TYPE - zPtrYstep = -((GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE))); -#endif -#ifdef PIXEL_ADDRESS - pixelYstep = BYTES_PER_ROW; -#endif - } - else { - ystep = 1; -#ifdef DEPTH_TYPE - zPtrYstep = (GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE)); -#endif -#ifdef PIXEL_ADDRESS - pixelYstep = -(BYTES_PER_ROW); -#endif - } - - ASSERT(dx >= 0); - ASSERT(dy >= 0); - - numPixels = MAX2(dx, dy); - - /* - * Span setup: compute start and step values for all interpolated values. - */ - interpFlags |= SPAN_RGBA; - if (ctx->Light.ShadeModel == GL_SMOOTH) { - span.red = ChanToFixed(vert0->color[0]); - span.green = ChanToFixed(vert0->color[1]); - span.blue = ChanToFixed(vert0->color[2]); - span.alpha = ChanToFixed(vert0->color[3]); - span.redStep = (ChanToFixed(vert1->color[0]) - span.red ) / numPixels; - span.greenStep = (ChanToFixed(vert1->color[1]) - span.green) / numPixels; - span.blueStep = (ChanToFixed(vert1->color[2]) - span.blue ) / numPixels; - span.alphaStep = (ChanToFixed(vert1->color[3]) - span.alpha) / numPixels; - } - else { - span.red = ChanToFixed(vert1->color[0]); - span.green = ChanToFixed(vert1->color[1]); - span.blue = ChanToFixed(vert1->color[2]); - span.alpha = ChanToFixed(vert1->color[3]); - span.redStep = 0; - span.greenStep = 0; - span.blueStep = 0; - span.alphaStep = 0; - } -#if defined(INTERP_Z) || defined(DEPTH_TYPE) - interpFlags |= SPAN_Z; - { - if (depthBits <= 16) { - span.z = FloatToFixed(vert0->attrib[FRAG_ATTRIB_WPOS][2]) + FIXED_HALF; - span.zStep = FloatToFixed( vert1->attrib[FRAG_ATTRIB_WPOS][2] - - vert0->attrib[FRAG_ATTRIB_WPOS][2]) / numPixels; - } - else { - /* don't use fixed point */ - span.z = (GLuint) vert0->attrib[FRAG_ATTRIB_WPOS][2]; - span.zStep = (GLint) (( vert1->attrib[FRAG_ATTRIB_WPOS][2] - - vert0->attrib[FRAG_ATTRIB_WPOS][2]) / numPixels); - } - } -#endif -#if defined(INTERP_ATTRIBS) - { - const GLfloat invLen = 1.0F / numPixels; - const GLfloat invw0 = vert0->attrib[FRAG_ATTRIB_WPOS][3]; - const GLfloat invw1 = vert1->attrib[FRAG_ATTRIB_WPOS][3]; - - span.attrStart[FRAG_ATTRIB_WPOS][3] = invw0; - span.attrStepX[FRAG_ATTRIB_WPOS][3] = (invw1 - invw0) * invLen; - span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0; - - ATTRIB_LOOP_BEGIN - if (swrast->_InterpMode[attr] == GL_FLAT) { - COPY_4V(span.attrStart[attr], vert1->attrib[attr]); - ASSIGN_4V(span.attrStepX[attr], 0.0, 0.0, 0.0, 0.0); - } - else { - GLuint c; - for (c = 0; c < 4; c++) { - float da; - span.attrStart[attr][c] = invw0 * vert0->attrib[attr][c]; - da = (invw1 * vert1->attrib[attr][c]) - span.attrStart[attr][c]; - span.attrStepX[attr][c] = da * invLen; - } - } - ASSIGN_4V(span.attrStepY[attr], 0.0, 0.0, 0.0, 0.0); - ATTRIB_LOOP_END - } -#endif - - INIT_SPAN(span, GL_LINE); - span.end = numPixels; - span.interpMask = interpFlags; - span.arrayMask = SPAN_XY; - - span.facing = swrast->PointLineFacing; - - - /* - * Draw - */ - - if (dx > dy) { - /*** X-major line ***/ - GLint i; - GLint errorInc = dy+dy; - GLint error = errorInc-dx; - GLint errorDec = error-dx; - - for (i = 0; i < dx; i++) { -#ifdef DEPTH_TYPE - GLuint Z = FixedToDepth(span.z); -#endif -#ifdef PLOT - PLOT( x0, y0 ); -#else - span.array->x[i] = x0; - span.array->y[i] = y0; -#endif - x0 += xstep; -#ifdef DEPTH_TYPE - zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); - span.z += span.zStep; -#endif -#ifdef PIXEL_ADDRESS - pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); -#endif - if (error < 0) { - error += errorInc; - } - else { - error += errorDec; - y0 += ystep; -#ifdef DEPTH_TYPE - zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); -#endif -#ifdef PIXEL_ADDRESS - pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); -#endif - } - } - } - else { - /*** Y-major line ***/ - GLint i; - GLint errorInc = dx+dx; - GLint error = errorInc-dy; - GLint errorDec = error-dy; - - for (i=0;ix[i] = x0; - span.array->y[i] = y0; -#endif - y0 += ystep; -#ifdef DEPTH_TYPE - zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); - span.z += span.zStep; -#endif -#ifdef PIXEL_ADDRESS - pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); -#endif - if (error<0) { - error += errorInc; - } - else { - error += errorDec; - x0 += xstep; -#ifdef DEPTH_TYPE - zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); -#endif -#ifdef PIXEL_ADDRESS - pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); -#endif - } - } - } - -#ifdef RENDER_SPAN - RENDER_SPAN( span ); -#endif - - (void)span; - -} - - -#undef NAME -#undef INTERP_Z -#undef INTERP_ATTRIBS -#undef PIXEL_ADDRESS -#undef PIXEL_TYPE -#undef DEPTH_TYPE -#undef BYTES_PER_ROW -#undef SETUP_CODE -#undef PLOT -#undef CLIP_HACK -#undef FixedToDepth -#undef RENDER_SPAN +/* + * Mesa 3-D graphics library + * Version: 7.0 + * + * 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. + */ + + +/* + * Line Rasterizer Template + * + * This file is #include'd to generate custom line rasterizers. + * + * The following macros may be defined to indicate what auxillary information + * must be interplated along the line: + * INTERP_Z - if defined, interpolate Z values + * INTERP_ATTRIBS - if defined, interpolate attribs (texcoords, varying, etc) + * + * When one can directly address pixels in the color buffer the following + * macros can be defined and used to directly compute pixel addresses during + * rasterization (see pixelPtr): + * PIXEL_TYPE - the datatype of a pixel (GLubyte, GLushort, GLuint) + * BYTES_PER_ROW - number of bytes per row in the color buffer + * PIXEL_ADDRESS(X,Y) - returns the address of pixel at (X,Y) where + * Y==0 at bottom of screen and increases upward. + * + * Similarly, for direct depth buffer access, this type is used for depth + * buffer addressing: + * DEPTH_TYPE - either GLushort or GLuint + * + * Optionally, one may provide one-time setup code + * SETUP_CODE - code which is to be executed once per line + * + * To actually "plot" each pixel the PLOT macro must be defined... + * PLOT(X,Y) - code to plot a pixel. Example: + * if (Z < *zPtr) { + * *zPtr = Z; + * color = pack_rgb( FixedToInt(r0), FixedToInt(g0), + * FixedToInt(b0) ); + * put_pixel( X, Y, color ); + * } + * + * This code was designed for the origin to be in the lower-left corner. + * + */ + + +static void +NAME( struct gl_context *ctx, const SWvertex *vert0, const SWvertex *vert1 ) +{ + const SWcontext *swrast = SWRAST_CONTEXT(ctx); + SWspan span; + GLuint interpFlags = 0; + GLint x0 = (GLint) vert0->attrib[FRAG_ATTRIB_WPOS][0]; + GLint x1 = (GLint) vert1->attrib[FRAG_ATTRIB_WPOS][0]; + GLint y0 = (GLint) vert0->attrib[FRAG_ATTRIB_WPOS][1]; + GLint y1 = (GLint) vert1->attrib[FRAG_ATTRIB_WPOS][1]; + GLint dx, dy; + GLint numPixels; + GLint xstep, ystep; +#if defined(DEPTH_TYPE) + const GLint depthBits = ctx->DrawBuffer->Visual.depthBits; + const GLint fixedToDepthShift = depthBits <= 16 ? FIXED_SHIFT : 0; + struct gl_renderbuffer *zrb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer; +#define FixedToDepth(F) ((F) >> fixedToDepthShift) + GLint zPtrXstep, zPtrYstep; + DEPTH_TYPE *zPtr; +#elif defined(INTERP_Z) + const GLint depthBits = ctx->DrawBuffer->Visual.depthBits; +#endif +#ifdef PIXEL_ADDRESS + PIXEL_TYPE *pixelPtr; + GLint pixelXstep, pixelYstep; +#endif + +#ifdef SETUP_CODE + SETUP_CODE +#endif + + (void) swrast; + + /* Cull primitives with malformed coordinates. + */ + { + GLfloat tmp = vert0->attrib[FRAG_ATTRIB_WPOS][0] + vert0->attrib[FRAG_ATTRIB_WPOS][1] + + vert1->attrib[FRAG_ATTRIB_WPOS][0] + vert1->attrib[FRAG_ATTRIB_WPOS][1]; + if (IS_INF_OR_NAN(tmp)) + return; + } + + /* + printf("%s():\n", __FUNCTION__); + printf(" (%f, %f, %f) -> (%f, %f, %f)\n", + vert0->attrib[FRAG_ATTRIB_WPOS][0], + vert0->attrib[FRAG_ATTRIB_WPOS][1], + vert0->attrib[FRAG_ATTRIB_WPOS][2], + vert1->attrib[FRAG_ATTRIB_WPOS][0], + vert1->attrib[FRAG_ATTRIB_WPOS][1], + vert1->attrib[FRAG_ATTRIB_WPOS][2]); + printf(" (%d, %d, %d) -> (%d, %d, %d)\n", + vert0->color[0], vert0->color[1], vert0->color[2], + vert1->color[0], vert1->color[1], vert1->color[2]); + printf(" (%d, %d, %d) -> (%d, %d, %d)\n", + vert0->specular[0], vert0->specular[1], vert0->specular[2], + vert1->specular[0], vert1->specular[1], vert1->specular[2]); + */ + +/* + * Despite being clipped to the view volume, the line's window coordinates + * may just lie outside the window bounds. That is, if the legal window + * coordinates are [0,W-1][0,H-1], it's possible for x==W and/or y==H. + * This quick and dirty code nudges the endpoints inside the window if + * necessary. + */ +#ifdef CLIP_HACK + { + GLint w = ctx->DrawBuffer->Width; + GLint h = ctx->DrawBuffer->Height; + if ((x0==w) | (x1==w)) { + if ((x0==w) & (x1==w)) + return; + x0 -= x0==w; + x1 -= x1==w; + } + if ((y0==h) | (y1==h)) { + if ((y0==h) & (y1==h)) + return; + y0 -= y0==h; + y1 -= y1==h; + } + } +#endif + + dx = x1 - x0; + dy = y1 - y0; + if (dx == 0 && dy == 0) + return; + + /* + printf("%s %d,%d %g %g %g %g %g %g %g %g\n", __FUNCTION__, dx, dy, + vert0->attrib[FRAG_ATTRIB_COL1][0], + vert0->attrib[FRAG_ATTRIB_COL1][1], + vert0->attrib[FRAG_ATTRIB_COL1][2], + vert0->attrib[FRAG_ATTRIB_COL1][3], + vert1->attrib[FRAG_ATTRIB_COL1][0], + vert1->attrib[FRAG_ATTRIB_COL1][1], + vert1->attrib[FRAG_ATTRIB_COL1][2], + vert1->attrib[FRAG_ATTRIB_COL1][3]); + */ + +#ifdef DEPTH_TYPE + zPtr = (DEPTH_TYPE *) zrb->GetPointer(ctx, zrb, x0, y0); +#endif +#ifdef PIXEL_ADDRESS + pixelPtr = (PIXEL_TYPE *) PIXEL_ADDRESS(x0,y0); +#endif + + if (dx<0) { + dx = -dx; /* make positive */ + xstep = -1; +#ifdef DEPTH_TYPE + zPtrXstep = -((GLint)sizeof(DEPTH_TYPE)); +#endif +#ifdef PIXEL_ADDRESS + pixelXstep = -((GLint)sizeof(PIXEL_TYPE)); +#endif + } + else { + xstep = 1; +#ifdef DEPTH_TYPE + zPtrXstep = ((GLint)sizeof(DEPTH_TYPE)); +#endif +#ifdef PIXEL_ADDRESS + pixelXstep = ((GLint)sizeof(PIXEL_TYPE)); +#endif + } + + if (dy<0) { + dy = -dy; /* make positive */ + ystep = -1; +#ifdef DEPTH_TYPE + zPtrYstep = -((GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE))); +#endif +#ifdef PIXEL_ADDRESS + pixelYstep = BYTES_PER_ROW; +#endif + } + else { + ystep = 1; +#ifdef DEPTH_TYPE + zPtrYstep = (GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE)); +#endif +#ifdef PIXEL_ADDRESS + pixelYstep = -(BYTES_PER_ROW); +#endif + } + + ASSERT(dx >= 0); + ASSERT(dy >= 0); + + numPixels = MAX2(dx, dy); + + /* + * Span setup: compute start and step values for all interpolated values. + */ + interpFlags |= SPAN_RGBA; + if (ctx->Light.ShadeModel == GL_SMOOTH) { + span.red = ChanToFixed(vert0->color[0]); + span.green = ChanToFixed(vert0->color[1]); + span.blue = ChanToFixed(vert0->color[2]); + span.alpha = ChanToFixed(vert0->color[3]); + span.redStep = (ChanToFixed(vert1->color[0]) - span.red ) / numPixels; + span.greenStep = (ChanToFixed(vert1->color[1]) - span.green) / numPixels; + span.blueStep = (ChanToFixed(vert1->color[2]) - span.blue ) / numPixels; + span.alphaStep = (ChanToFixed(vert1->color[3]) - span.alpha) / numPixels; + } + else { + span.red = ChanToFixed(vert1->color[0]); + span.green = ChanToFixed(vert1->color[1]); + span.blue = ChanToFixed(vert1->color[2]); + span.alpha = ChanToFixed(vert1->color[3]); + span.redStep = 0; + span.greenStep = 0; + span.blueStep = 0; + span.alphaStep = 0; + } +#if defined(INTERP_Z) || defined(DEPTH_TYPE) + interpFlags |= SPAN_Z; + { + if (depthBits <= 16) { + span.z = FloatToFixed(vert0->attrib[FRAG_ATTRIB_WPOS][2]) + FIXED_HALF; + span.zStep = FloatToFixed( vert1->attrib[FRAG_ATTRIB_WPOS][2] + - vert0->attrib[FRAG_ATTRIB_WPOS][2]) / numPixels; + } + else { + /* don't use fixed point */ + span.z = (GLuint) vert0->attrib[FRAG_ATTRIB_WPOS][2]; + span.zStep = (GLint) (( vert1->attrib[FRAG_ATTRIB_WPOS][2] + - vert0->attrib[FRAG_ATTRIB_WPOS][2]) / numPixels); + } + } +#endif +#if defined(INTERP_ATTRIBS) + { + const GLfloat invLen = 1.0F / numPixels; + const GLfloat invw0 = vert0->attrib[FRAG_ATTRIB_WPOS][3]; + const GLfloat invw1 = vert1->attrib[FRAG_ATTRIB_WPOS][3]; + + span.attrStart[FRAG_ATTRIB_WPOS][3] = invw0; + span.attrStepX[FRAG_ATTRIB_WPOS][3] = (invw1 - invw0) * invLen; + span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0; + + ATTRIB_LOOP_BEGIN + if (swrast->_InterpMode[attr] == GL_FLAT) { + COPY_4V(span.attrStart[attr], vert1->attrib[attr]); + ASSIGN_4V(span.attrStepX[attr], 0.0, 0.0, 0.0, 0.0); + } + else { + GLuint c; + for (c = 0; c < 4; c++) { + float da; + span.attrStart[attr][c] = invw0 * vert0->attrib[attr][c]; + da = (invw1 * vert1->attrib[attr][c]) - span.attrStart[attr][c]; + span.attrStepX[attr][c] = da * invLen; + } + } + ASSIGN_4V(span.attrStepY[attr], 0.0, 0.0, 0.0, 0.0); + ATTRIB_LOOP_END + } +#endif + + INIT_SPAN(span, GL_LINE); + span.end = numPixels; + span.interpMask = interpFlags; + span.arrayMask = SPAN_XY; + + span.facing = swrast->PointLineFacing; + + + /* + * Draw + */ + + if (dx > dy) { + /*** X-major line ***/ + GLint i; + GLint errorInc = dy+dy; + GLint error = errorInc-dx; + GLint errorDec = error-dx; + + for (i = 0; i < dx; i++) { +#ifdef DEPTH_TYPE + GLuint Z = FixedToDepth(span.z); +#endif +#ifdef PLOT + PLOT( x0, y0 ); +#else + span.array->x[i] = x0; + span.array->y[i] = y0; +#endif + x0 += xstep; +#ifdef DEPTH_TYPE + zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); + span.z += span.zStep; +#endif +#ifdef PIXEL_ADDRESS + pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); +#endif + if (error < 0) { + error += errorInc; + } + else { + error += errorDec; + y0 += ystep; +#ifdef DEPTH_TYPE + zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); +#endif +#ifdef PIXEL_ADDRESS + pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); +#endif + } + } + } + else { + /*** Y-major line ***/ + GLint i; + GLint errorInc = dx+dx; + GLint error = errorInc-dy; + GLint errorDec = error-dy; + + for (i=0;ix[i] = x0; + span.array->y[i] = y0; +#endif + y0 += ystep; +#ifdef DEPTH_TYPE + zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); + span.z += span.zStep; +#endif +#ifdef PIXEL_ADDRESS + pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); +#endif + if (error<0) { + error += errorInc; + } + else { + error += errorDec; + x0 += xstep; +#ifdef DEPTH_TYPE + zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); +#endif +#ifdef PIXEL_ADDRESS + pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); +#endif + } + } + } + +#ifdef RENDER_SPAN + RENDER_SPAN( span ); +#endif + + (void)span; + +} + + +#undef NAME +#undef INTERP_Z +#undef INTERP_ATTRIBS +#undef PIXEL_ADDRESS +#undef PIXEL_TYPE +#undef DEPTH_TYPE +#undef BYTES_PER_ROW +#undef SETUP_CODE +#undef PLOT +#undef CLIP_HACK +#undef FixedToDepth +#undef RENDER_SPAN -- cgit v1.2.3