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- /* $Id: ss_triangle.c,v 1.20 2002/10/29 22:25:57 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 3.5
- *
- * Copyright (C) 1999-2001 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.
- *
- * Authors:
- * Keith Whitwell <keith@tungstengraphics.com>
- */
-
- #include "glheader.h"
- #include "colormac.h"
- #include "macros.h"
- #include "mtypes.h"
-
- #include "tnl/t_context.h"
-
- #include "ss_triangle.h"
- #include "ss_context.h"
-
- #define SS_RGBA_BIT 0x1
- #define SS_OFFSET_BIT 0x2
- #define SS_TWOSIDE_BIT 0x4
- #define SS_UNFILLED_BIT 0x8
- #define SS_MAX_TRIFUNC 0x10
-
- static triangle_func tri_tab[SS_MAX_TRIFUNC];
- static quad_func quad_tab[SS_MAX_TRIFUNC];
-
-
- static void _swsetup_render_line_tri( GLcontext *ctx,
- GLuint e0, GLuint e1, GLuint e2,
- GLuint facing )
- {
- SScontext *swsetup = SWSETUP_CONTEXT(ctx);
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLubyte *ef = VB->EdgeFlag;
- SWvertex *verts = swsetup->verts;
- SWvertex *v0 = &verts[e0];
- SWvertex *v1 = &verts[e1];
- SWvertex *v2 = &verts[e2];
- GLchan c[2][4];
- GLchan s[2][4];
- GLuint i[2];
-
- /* cull testing */
- if (ctx->Polygon.CullFlag) {
- if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
- return;
- if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
- return;
- }
-
- if (ctx->_TriangleCaps & DD_FLATSHADE) {
- COPY_CHAN4(c[0], v0->color);
- COPY_CHAN4(c[1], v1->color);
- COPY_CHAN4(s[0], v0->specular);
- COPY_CHAN4(s[1], v1->specular);
- i[0] = v0->index;
- i[1] = v1->index;
-
- COPY_CHAN4(v0->color, v2->color);
- COPY_CHAN4(v1->color, v2->color);
- COPY_CHAN4(v0->specular, v2->specular);
- COPY_CHAN4(v1->specular, v2->specular);
- v0->index = v2->index;
- v1->index = v2->index;
- }
-
- if (swsetup->render_prim == GL_POLYGON) {
- if (ef[e2]) _swrast_Line( ctx, v2, v0 );
- if (ef[e0]) _swrast_Line( ctx, v0, v1 );
- if (ef[e1]) _swrast_Line( ctx, v1, v2 );
- } else {
- if (ef[e0]) _swrast_Line( ctx, v0, v1 );
- if (ef[e1]) _swrast_Line( ctx, v1, v2 );
- if (ef[e2]) _swrast_Line( ctx, v2, v0 );
- }
-
- if (ctx->_TriangleCaps & DD_FLATSHADE) {
- COPY_CHAN4(v0->color, c[0]);
- COPY_CHAN4(v1->color, c[1]);
- COPY_CHAN4(v0->specular, s[0]);
- COPY_CHAN4(v1->specular, s[1]);
- v0->index = i[0];
- v1->index = i[1];
- }
- }
-
- static void _swsetup_render_point_tri( GLcontext *ctx,
- GLuint e0, GLuint e1, GLuint e2,
- GLuint facing )
- {
- SScontext *swsetup = SWSETUP_CONTEXT(ctx);
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLubyte *ef = VB->EdgeFlag;
- SWvertex *verts = swsetup->verts;
- SWvertex *v0 = &verts[e0];
- SWvertex *v1 = &verts[e1];
- SWvertex *v2 = &verts[e2];
- GLchan c[2][4];
- GLchan s[2][4];
- GLuint i[2];
-
- /* cull testing */
- if (ctx->Polygon.CullFlag) {
- if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
- return;
- if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
- return;
- }
-
- if (ctx->_TriangleCaps & DD_FLATSHADE) {
- COPY_CHAN4(c[0], v0->color);
- COPY_CHAN4(c[1], v1->color);
- COPY_CHAN4(s[0], v0->specular);
- COPY_CHAN4(s[1], v1->specular);
- i[0] = v0->index;
- i[1] = v1->index;
-
- COPY_CHAN4(v0->color, v2->color);
- COPY_CHAN4(v1->color, v2->color);
- COPY_CHAN4(v0->specular, v2->specular);
- COPY_CHAN4(v1->specular, v2->specular);
- v0->index = v2->index;
- v1->index = v2->index;
- }
-
- if (ef[e0]) _swrast_Point( ctx, v0 );
- if (ef[e1]) _swrast_Point( ctx, v1 );
- if (ef[e2]) _swrast_Point( ctx, v2 );
-
- if (ctx->_TriangleCaps & DD_FLATSHADE) {
- COPY_CHAN4(v0->color, c[0]);
- COPY_CHAN4(v1->color, c[1]);
- COPY_CHAN4(v0->specular, s[0]);
- COPY_CHAN4(v1->specular, s[1]);
- v0->index = i[0];
- v1->index = i[1];
- }
- _swrast_flush(ctx);
- }
-
- #define SS_COLOR(a,b) COPY_CHAN4(a,b)
- #define SS_SPEC(a,b) COPY_3V(a,b)
- #define SS_IND(a,b) (a = b)
-
- #define IND (0)
- #define TAG(x) x
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT)
- #define TAG(x) x##_offset
- #include "ss_tritmp.h"
-
- #define IND (SS_TWOSIDE_BIT)
- #define TAG(x) x##_twoside
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT)
- #define TAG(x) x##_offset_twoside
- #include "ss_tritmp.h"
-
- #define IND (SS_UNFILLED_BIT)
- #define TAG(x) x##_unfilled
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT)
- #define TAG(x) x##_offset_unfilled
- #include "ss_tritmp.h"
-
- #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
- #define TAG(x) x##_twoside_unfilled
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT)
- #define TAG(x) x##_offset_twoside_unfilled
- #include "ss_tritmp.h"
-
- #define IND (0|SS_RGBA_BIT)
- #define TAG(x) x##_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_offset_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_TWOSIDE_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_twoside_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_offset_twoside_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_UNFILLED_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_unfilled_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_offset_unfilled_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_twoside_unfilled_rgba
- #include "ss_tritmp.h"
-
- #define IND (SS_OFFSET_BIT|SS_TWOSIDE_BIT|SS_UNFILLED_BIT|SS_RGBA_BIT)
- #define TAG(x) x##_offset_twoside_unfilled_rgba
- #include "ss_tritmp.h"
-
-
- void _swsetup_trifuncs_init( GLcontext *ctx )
- {
- (void) ctx;
-
- init();
- init_offset();
- init_twoside();
- init_offset_twoside();
- init_unfilled();
- init_offset_unfilled();
- init_twoside_unfilled();
- init_offset_twoside_unfilled();
-
- init_rgba();
- init_offset_rgba();
- init_twoside_rgba();
- init_offset_twoside_rgba();
- init_unfilled_rgba();
- init_offset_unfilled_rgba();
- init_twoside_unfilled_rgba();
- init_offset_twoside_unfilled_rgba();
- }
-
-
- static void swsetup_points( GLcontext *ctx, GLuint first, GLuint last )
- {
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
- GLuint i;
-
- if (VB->Elts) {
- for (i = first; i < last; i++)
- if (VB->ClipMask[VB->Elts[i]] == 0)
- _swrast_Point( ctx, &verts[VB->Elts[i]] );
- }
- else {
- for (i = first; i < last; i++)
- if (VB->ClipMask[i] == 0)
- _swrast_Point( ctx, &verts[i] );
- }
- }
-
- static void swsetup_line( GLcontext *ctx, GLuint v0, GLuint v1 )
- {
- SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts;
- _swrast_Line( ctx, &verts[v0], &verts[v1] );
- }
-
-
-
- void _swsetup_choose_trifuncs( GLcontext *ctx )
- {
- TNLcontext *tnl = TNL_CONTEXT(ctx);
- GLuint ind = 0;
-
- if (ctx->Polygon.OffsetPoint ||
- ctx->Polygon.OffsetLine ||
- ctx->Polygon.OffsetFill)
- ind |= SS_OFFSET_BIT;
-
- if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
- ind |= SS_TWOSIDE_BIT;
-
- /* We piggyback the two-sided stencil front/back determination on the
- * unfilled triangle path.
- */
- if ((ctx->_TriangleCaps & DD_TRI_UNFILLED) ||
- (ctx->Stencil.Enabled && ctx->Stencil.TestTwoSide))
- ind |= SS_UNFILLED_BIT;
-
- if (ctx->Visual.rgbMode)
- ind |= SS_RGBA_BIT;
-
- tnl->Driver.Render.Triangle = tri_tab[ind];
- tnl->Driver.Render.Quad = quad_tab[ind];
- tnl->Driver.Render.Line = swsetup_line;
- tnl->Driver.Render.Points = swsetup_points;
-
- ctx->_Facing = 0;
- }
-