A new module to provide RasterSetup and advanced triangle/line/point

functionality layered on top of the software rasterizer.

An example entrypoint:
	void _swsetup_Triangle( GLcontext, GLuint, GLuint, GLuint, GLuint )

will coerce the software rasterizer to draw flat, twoside-lit,
unfilled and offset triangles (including decomposition to points or lines).

1 files changed, 286 insertions, 0 deletions

diff --git a/src/mesa/swrast_setup/ss_tritmp.h b/src/mesa/swrast_setup/ss_tritmp.h
new file mode 100644
index 0000000000..570827a1b5
--- /dev/null
+++ b/src/mesa/swrast_setup/ss_tritmp.h
@@ -0,0 +1,286 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ * 
+ * Copyright (C) 1999  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 <keithw@valinux.com>
+ */
+
+
+static void TAG(triangle)(GLcontext *ctx,
+			  GLuint e0, GLuint e1, GLuint e2,
+			  GLuint pv)
+{
+   struct vertex_buffer *VB = ctx->VB;
+   SWvertex *verts = SWSETUP_VB(VB)->verts;
+   SWvertex *v[3];
+   GLfloat offset;
+   GLfloat z[3];
+   GLubyte c[3][4], s[3][4];
+   GLuint i[3];
+   GLenum mode = GL_FILL;
+
+   v[0] = &verts[e0];
+   v[1] = &verts[e1];
+   v[2] = &verts[e2];
+
+   if (IND & (SS_TWOSIDE_BIT | SS_FLAT_BIT)) {
+      SS_COLOR(c[0], v[0]->color);
+      SS_COLOR(c[1], v[1]->color);
+      SS_COLOR(c[2], v[2]->color);
+      
+      SS_SPEC(s[0], v[0]->specular);
+      SS_SPEC(s[1], v[1]->specular);
+      SS_SPEC(s[2], v[2]->specular);
+
+      SS_IND(i[0], v[0]->index);
+      SS_IND(i[1], v[1]->index);
+      SS_IND(i[2], v[2]->index);
+   }
+
+   if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT))
+   {
+      GLfloat ex = v[0]->win[0] - v[2]->win[0];
+      GLfloat ey = v[0]->win[1] - v[2]->win[1];
+      GLfloat fx = v[1]->win[0] - v[2]->win[0];
+      GLfloat fy = v[1]->win[1] - v[2]->win[1];
+      GLfloat cc  = ex*fy - ey*fx;
+
+      if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
+      {
+	 GLuint  facing = (cc < 0.0) ^ ctx->Polygon.FrontBit;
+	
+	 if (IND & SS_UNFILLED_BIT)
+	    mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;
+ 
+	 if (IND & SS_TWOSIDE_BIT) {
+	    GLubyte (*vbcolor)[4] = VB->Color[facing]->data;
+	    GLubyte (*vbspec)[4] = VB->SecondaryColor[facing]->data;
+	    GLuint *vbindex = VB->Index[facing]->data;
+
+	    if (IND & SS_FLAT_BIT) {
+	       SS_COLOR(v[0]->color, vbcolor[pv]);
+	       SS_COLOR(v[1]->color, vbcolor[pv]);
+	       SS_COLOR(v[2]->color, vbcolor[pv]);
+
+	       SS_SPEC(v[0]->specular, vbspec[pv]);
+	       SS_SPEC(v[1]->specular, vbspec[pv]);
+	       SS_SPEC(v[2]->specular, vbspec[pv]);
+
+	       SS_IND(v[0]->index, vbindex[pv]);
+	       SS_IND(v[1]->index, vbindex[pv]);
+	       SS_IND(v[2]->index, vbindex[pv]);
+	    } else {
+	       SS_COLOR(v[0]->color, vbcolor[e0]);
+	       SS_COLOR(v[1]->color, vbcolor[e1]);
+	       SS_COLOR(v[2]->color, vbcolor[e2]);
+
+	       SS_SPEC(v[0]->specular, vbspec[e0]);
+	       SS_SPEC(v[1]->specular, vbspec[e1]);
+	       SS_SPEC(v[2]->specular, vbspec[e2]);
+
+	       SS_IND(v[0]->index, vbindex[e0]);
+	       SS_IND(v[1]->index, vbindex[e1]);
+	       SS_IND(v[2]->index, vbindex[e2]);
+	    }
+	 }   
+      }
+
+      if (IND & SS_OFFSET_BIT)
+      {
+	 offset = ctx->Polygon.OffsetUnits;
+	 z[0] = v[0]->win[2];
+	 z[1] = v[1]->win[2];
+	 z[2] = v[2]->win[2];
+	 if (cc * cc > 1e-16) {
+	    GLfloat ez = z[0] - z[2];
+	    GLfloat fz = z[1] - z[2];
+	    GLfloat a = ey*fz - ez*fy;
+	    GLfloat b = ez*fx - ex*fz;
+	    GLfloat ic = 1.0 / cc;
+	    GLfloat ac = a * ic;
+	    GLfloat bc = b * ic;
+	    if (ac < 0.0f) ac = -ac;
+	    if (bc < 0.0f) bc = -bc;
+	    offset += MAX2(ac, bc) * ctx->Polygon.OffsetFactor;
+	 }
+      }
+   }
+   else if(IND & SS_FLAT_BIT)
+   {
+      GLubyte *color = VB->Color[0]->data[pv];
+      GLubyte *spec = VB->SecondaryColor[0]->data[pv];
+      GLuint index = VB->Index[0]->data[pv];
+
+      SS_COLOR(v[0]->color, color);
+      SS_COLOR(v[1]->color, color);
+      SS_COLOR(v[2]->color, color);
+      
+      SS_SPEC(v[0]->specular, spec);
+      SS_SPEC(v[1]->specular, spec);
+      SS_SPEC(v[2]->specular, spec);
+
+      SS_IND(v[0]->index, index);
+      SS_IND(v[1]->index, index);
+      SS_IND(v[2]->index, index);
+   }
+
+   if (mode == GL_POINT) {
+      GLubyte *ef = VB->EdgeFlagPtr->data;
+      if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) {
+	 v[0]->win[2] += offset;
+	 v[1]->win[2] += offset;
+	 v[2]->win[2] += offset;
+      }
+      if (ef[e0]&0x1) { ef[e0] &= ~0x1; _swrast_Point( ctx, v[0] ); }
+      if (ef[e1]&0x1) { ef[e1] &= ~0x1; _swrast_Point( ctx, v[1] ); }
+      if (ef[e2]&0x2) { ef[e2] &= ~0x2; _swrast_Point( ctx, v[2] ); }
+   } else if (mode == GL_LINE) {
+      GLubyte *ef = VB->EdgeFlagPtr->data;
+      if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
+	 v[0]->win[2] += offset;
+	 v[1]->win[2] += offset;
+	 v[2]->win[2] += offset;
+      }
+      if (ef[e0]&0x1) { ef[e0] &= ~0x1; _swrast_Line( ctx, v[0], v[1] ); }
+      if (ef[e1]&0x1) { ef[e1] &= ~0x1; _swrast_Line( ctx, v[1], v[2] ); }
+      if (ef[e2]&0x2) { ef[e2] &= ~0x2; _swrast_Line( ctx, v[2], v[0] ); }
+   } else {
+      if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
+	 v[0]->win[2] += offset;
+	 v[1]->win[2] += offset;
+	 v[2]->win[2] += offset;
+      }
+      _swrast_Triangle( ctx, v[0], v[1], v[2] ); 
+   }
+
+   if (IND & SS_OFFSET_BIT) {
+      v[0]->win[2] = z[0];
+      v[1]->win[2] = z[1];
+      v[2]->win[2] = z[2];
+   }
+
+   if (IND & (SS_FLAT_BIT | SS_TWOSIDE_BIT)) {
+      SS_COLOR(v[0]->color, c[0]);
+      SS_COLOR(v[1]->color, c[1]);
+      SS_COLOR(v[2]->color, c[2]);
+      
+      SS_SPEC(v[0]->specular, s[0]);
+      SS_SPEC(v[1]->specular, s[1]);
+      SS_SPEC(v[2]->specular, s[2]);
+
+      SS_IND(v[0]->index, i[0]);
+      SS_IND(v[1]->index, i[1]);
+      SS_IND(v[2]->index, i[2]);
+   } 
+}
+
+
+
+/* Need to do something with edgeflags:
+ */
+static void TAG(quad)( GLcontext *ctx, GLuint v0,
+		       GLuint v1, GLuint v2, GLuint v3, 
+		       GLuint pv )
+{
+   TAG(triangle)( ctx, v0, v1, v3, pv );
+   TAG(triangle)( ctx, v1, v2, v3, pv );
+}
+
+
+static void TAG(line)( GLcontext *ctx, GLuint v0, GLuint v1, GLuint pv )
+{
+   struct vertex_buffer *VB = ctx->VB;
+   SWvertex *verts = SWSETUP_VB(VB)->verts;
+   GLubyte c[2][4], s[2][4];
+   GLuint i[2];
+   SWvertex *vert0 = &verts[v0];
+   SWvertex *vert1 = &verts[v1];
+
+
+   if (IND & SS_FLAT_BIT) {
+      GLubyte *color = VB->Color[0]->data[pv];
+      GLubyte *spec = VB->SecondaryColor[0]->data[pv];
+      GLuint index = VB->Index[0]->data[pv];
+
+      SS_COLOR(c[0], vert0->color);
+      SS_COLOR(c[1], vert1->color);
+      
+      SS_SPEC(s[0], vert0->specular);
+      SS_SPEC(s[1], vert1->specular);
+
+      SS_IND(i[0], vert0->index);
+      SS_IND(i[1], vert1->index);
+
+      SS_COLOR(vert0->color, color);
+      SS_COLOR(vert1->color, color);
+      
+      SS_SPEC(vert0->specular, spec);
+      SS_SPEC(vert1->specular, spec);
+
+      SS_IND(vert0->index, index);
+      SS_IND(vert1->index, index);
+   }
+
+   _swrast_Line( ctx, vert0, vert1 );
+
+   if (IND & SS_FLAT_BIT) {
+      SS_COLOR(vert0->color, c[0]);
+      SS_COLOR(vert1->color, c[1]);
+      
+      SS_SPEC(vert0->specular, s[0]);
+      SS_SPEC(vert1->specular, s[1]);
+
+      SS_IND(vert0->index, i[0]);
+      SS_IND(vert1->index, i[1]);
+   }
+}
+
+
+static void TAG(points)( GLcontext *ctx, GLuint first, GLuint last )
+{
+   struct vertex_buffer *VB = ctx->VB;
+   SWvertex *verts = SWSETUP_VB(VB)->verts;
+   int i;
+   
+   for(i=first;i<=last;i++) 
+      if(VB->ClipMask[i]==0)
+	 _swrast_Point( ctx, &verts[i] );
+}
+
+
+
+
+static void TAG(init)( void )
+{
+   tri_tab[IND] = TAG(triangle);
+   quad_tab[IND] = TAG(quad);
+   line_tab[IND] = TAG(line);
+   points_tab[IND] = TAG(points);
+}
+
+
+#undef IND
+#undef TAG
+			 
+
+