From 8e4a95a93d15a6707a29454cd47e10b08314cda2 Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Thu, 24 May 2007 10:41:34 +0100 Subject: First version of the softpipe rasterizer. This will flesh out to hopefully acheive 3 things: - New software rasterizer for mesa - New driver model for mesa & dri with much smaller drivers - The basis for the cell driver. It's got a long way to go yet, but will at least run trivial/tri.c. --- src/mesa/softpipe/generic/g_prim_offset.c | 157 ++++++++++++++++++++++++++++++ 1 file changed, 157 insertions(+) create mode 100644 src/mesa/softpipe/generic/g_prim_offset.c (limited to 'src/mesa/softpipe/generic/g_prim_offset.c') diff --git a/src/mesa/softpipe/generic/g_prim_offset.c b/src/mesa/softpipe/generic/g_prim_offset.c new file mode 100644 index 0000000000..801ce9a441 --- /dev/null +++ b/src/mesa/softpipe/generic/g_prim_offset.c @@ -0,0 +1,157 @@ +/************************************************************************** + * + * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * 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, sub license, 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 (including the + * next paragraph) 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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. + * + **************************************************************************/ + +/* Authors: Keith Whitwell + */ +#include "imports.h" +#include "macros.h" + +#include "g_context.h" +#include "g_prim.h" + + + +struct offset_stage { + struct prim_stage stage; + + GLuint hw_data_offset; + + GLfloat scale; + GLfloat units; +}; + + + +static INLINE struct offset_stage *offset_stage( struct prim_stage *stage ) +{ + return (struct offset_stage *)stage; +} + + +static void offset_begin( struct prim_stage *stage ) +{ + struct offset_stage *offset = offset_stage(stage); + + offset->units = stage->generic->setup.offset_units; + offset->scale = stage->generic->setup.offset_scale; + + stage->next->begin( stage->next ); +} + + +/* Offset tri. Some hardware can handle this, but not usually when + * doing unfilled rendering. + */ +static void do_offset_tri( struct prim_stage *stage, + struct prim_header *header ) +{ + struct offset_stage *offset = offset_stage(stage); + GLfloat inv_det = 1.0 / header->det; + + /* Window coords: + */ + GLfloat *v0 = (GLfloat *)&(header->v[0]->data[0]); + GLfloat *v1 = (GLfloat *)&(header->v[1]->data[0]); + GLfloat *v2 = (GLfloat *)&(header->v[2]->data[0]); + + GLfloat ex = v0[0] - v2[2]; + GLfloat fx = v1[0] - v2[2]; + GLfloat ey = v0[1] - v2[2]; + GLfloat fy = v1[1] - v2[2]; + GLfloat ez = v0[2] - v2[2]; + GLfloat fz = v1[2] - v2[2]; + + GLfloat a = ey*fz - ez*fy; + GLfloat b = ez*fx - ex*fz; + + GLfloat ac = a * inv_det; + GLfloat bc = b * inv_det; + GLfloat zoffset; + + if ( ac < 0.0f ) ac = -ac; + if ( bc < 0.0f ) bc = -bc; + + zoffset = offset->units + MAX2( ac, bc ) * offset->scale; + + v0[2] += zoffset; + v1[2] += zoffset; + v2[2] += zoffset; + + stage->next->tri( stage->next, header ); +} + + +static void offset_tri( struct prim_stage *stage, + struct prim_header *header ) +{ + struct prim_header tmp; + + tmp.det = header->det; + tmp.v[0] = dup_vert(stage, header->v[0], 0); + tmp.v[1] = dup_vert(stage, header->v[1], 1); + tmp.v[2] = dup_vert(stage, header->v[2], 2); + + do_offset_tri( stage->next, &tmp ); +} + + + +static void offset_line( struct prim_stage *stage, + struct prim_header *header ) +{ + stage->next->line( stage->next, header ); +} + + +static void offset_point( struct prim_stage *stage, + struct prim_header *header ) +{ + stage->next->point( stage->next, header ); +} + + +static void offset_end( struct prim_stage *stage ) +{ + stage->next->end( stage->next ); +} + +struct prim_stage *prim_offset( struct generic_context *generic ) +{ + struct offset_stage *offset = CALLOC_STRUCT(offset_stage); + + prim_alloc_tmps( &offset->stage, 3 ); + + offset->stage.generic = generic; + offset->stage.next = NULL; + offset->stage.begin = offset_begin; + offset->stage.point = offset_point; + offset->stage.line = offset_line; + offset->stage.tri = offset_tri; + offset->stage.end = offset_end; + + return &offset->stage; +} -- cgit v1.2.3