ss_tritmp.h revision a5820159056fb9c3f5da6b3ae4570cd97b95835d
1/* 2 * Mesa 3-D graphics library 3 * Version: 6.1 4 * 5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included 15 * in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Keith Whitwell <keith@tungstengraphics.com> 26 */ 27 28 29static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) 30{ 31 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 32 SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts; 33 SWvertex *v[3]; 34 GLfloat z[3]; 35 GLfloat offset; 36 GLenum mode = GL_FILL; 37 GLuint facing = 0; 38 GLchan saved_color[3][4]; 39 GLchan saved_spec[3][4]; 40 GLfloat saved_index[3]; 41 42 v[0] = &verts[e0]; 43 v[1] = &verts[e1]; 44 v[2] = &verts[e2]; 45 46 47 if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT)) 48 { 49 GLfloat ex = v[0]->win[0] - v[2]->win[0]; 50 GLfloat ey = v[0]->win[1] - v[2]->win[1]; 51 GLfloat fx = v[1]->win[0] - v[2]->win[0]; 52 GLfloat fy = v[1]->win[1] - v[2]->win[1]; 53 GLfloat cc = ex*fy - ey*fx; 54 55 if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)) 56 { 57 facing = (cc < 0.0) ^ ctx->Polygon._FrontBit; 58 if (ctx->Stencil.TestTwoSide) 59 ctx->_Facing = facing; /* for 2-sided stencil test */ 60 61 if (IND & SS_UNFILLED_BIT) 62 mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode; 63 64 if (facing == 1) { 65 if (IND & SS_TWOSIDE_BIT) { 66 if (IND & SS_RGBA_BIT) { 67 GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data; 68 69 COPY_CHAN4(saved_color[0], v[0]->color); 70 COPY_CHAN4(saved_color[1], v[1]->color); 71 COPY_CHAN4(saved_color[2], v[2]->color); 72 73 if (VB->ColorPtr[1]->stride) { 74 SS_COLOR(v[0]->color, vbcolor[e0]); 75 SS_COLOR(v[1]->color, vbcolor[e1]); 76 SS_COLOR(v[2]->color, vbcolor[e2]); 77 } 78 else { 79 SS_COLOR(v[0]->color, vbcolor[0]); 80 SS_COLOR(v[1]->color, vbcolor[0]); 81 SS_COLOR(v[2]->color, vbcolor[0]); 82 } 83 84 if (VB->SecondaryColorPtr[1]) { 85 GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data; 86 87 COPY_CHAN4(saved_spec[0], v[0]->specular); 88 COPY_CHAN4(saved_spec[1], v[1]->specular); 89 COPY_CHAN4(saved_spec[2], v[2]->specular); 90 91 if (VB->SecondaryColorPtr[1]->stride) { 92 SS_SPEC(v[0]->specular, vbspec[e0]); 93 SS_SPEC(v[1]->specular, vbspec[e1]); 94 SS_SPEC(v[2]->specular, vbspec[e2]); 95 } 96 else { 97 SS_SPEC(v[0]->specular, vbspec[0]); 98 SS_SPEC(v[1]->specular, vbspec[0]); 99 SS_SPEC(v[2]->specular, vbspec[0]); 100 } 101 } 102 } else { 103 GLfloat *vbindex = (GLfloat *)VB->IndexPtr[1]->data; 104 saved_index[0] = v[0]->index; 105 saved_index[1] = v[1]->index; 106 saved_index[2] = v[2]->index; 107 108 SS_IND(v[0]->index, (GLuint) vbindex[e0]); 109 SS_IND(v[1]->index, (GLuint) vbindex[e1]); 110 SS_IND(v[2]->index, (GLuint) vbindex[e2]); 111 } 112 } 113 } 114 } 115 116 if (IND & SS_OFFSET_BIT) 117 { 118 offset = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD; 119 z[0] = v[0]->win[2]; 120 z[1] = v[1]->win[2]; 121 z[2] = v[2]->win[2]; 122 if (cc * cc > 1e-16) { 123 const GLfloat ez = z[0] - z[2]; 124 const GLfloat fz = z[1] - z[2]; 125 const GLfloat oneOverArea = 1.0F / cc; 126 const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea); 127 const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea); 128 offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor; 129 /* Unfortunately, we need to clamp to prevent negative Zs below. 130 * Technically, we should do the clamping per-fragment. 131 */ 132 offset = MAX2(offset, -v[0]->win[2]); 133 offset = MAX2(offset, -v[1]->win[2]); 134 offset = MAX2(offset, -v[2]->win[2]); 135 } 136 } 137 } 138 139 if (mode == GL_POINT) { 140 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) { 141 v[0]->win[2] += offset; 142 v[1]->win[2] += offset; 143 v[2]->win[2] += offset; 144 } 145 _swsetup_render_point_tri( ctx, e0, e1, e2, facing ); 146 } else if (mode == GL_LINE) { 147 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) { 148 v[0]->win[2] += offset; 149 v[1]->win[2] += offset; 150 v[2]->win[2] += offset; 151 } 152 _swsetup_render_line_tri( ctx, e0, e1, e2, facing ); 153 } else { 154 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) { 155 v[0]->win[2] += offset; 156 v[1]->win[2] += offset; 157 v[2]->win[2] += offset; 158 } 159 _swrast_Triangle( ctx, v[0], v[1], v[2] ); 160 } 161 162 if (IND & SS_OFFSET_BIT) { 163 v[0]->win[2] = z[0]; 164 v[1]->win[2] = z[1]; 165 v[2]->win[2] = z[2]; 166 } 167 168 if (IND & SS_TWOSIDE_BIT) { 169 if (facing == 1) { 170 if (IND & SS_RGBA_BIT) { 171 COPY_CHAN4(v[0]->color, saved_color[0]); 172 COPY_CHAN4(v[1]->color, saved_color[1]); 173 COPY_CHAN4(v[2]->color, saved_color[2]); 174 if (VB->SecondaryColorPtr[1]) { 175 COPY_CHAN4(v[0]->specular, saved_spec[0]); 176 COPY_CHAN4(v[1]->specular, saved_spec[1]); 177 COPY_CHAN4(v[2]->specular, saved_spec[2]); 178 } 179 } else { 180 v[0]->index = saved_index[0]; 181 v[1]->index = saved_index[1]; 182 v[2]->index = saved_index[2]; 183 } 184 } 185 } 186} 187 188 189 190/* Need to fixup edgeflags when decomposing to triangles: 191 */ 192static void TAG(quadfunc)( GLcontext *ctx, GLuint v0, 193 GLuint v1, GLuint v2, GLuint v3 ) 194{ 195 if (IND & SS_UNFILLED_BIT) { 196 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 197 GLubyte ef1 = VB->EdgeFlag[v1]; 198 GLubyte ef3 = VB->EdgeFlag[v3]; 199 VB->EdgeFlag[v1] = 0; 200 TAG(triangle)( ctx, v0, v1, v3 ); 201 VB->EdgeFlag[v1] = ef1; 202 VB->EdgeFlag[v3] = 0; 203 TAG(triangle)( ctx, v1, v2, v3 ); 204 VB->EdgeFlag[v3] = ef3; 205 } else { 206 TAG(triangle)( ctx, v0, v1, v3 ); 207 TAG(triangle)( ctx, v1, v2, v3 ); 208 } 209} 210 211 212 213 214static void TAG(init)( void ) 215{ 216 tri_tab[IND] = TAG(triangle); 217 quad_tab[IND] = TAG(quadfunc); 218} 219 220 221#undef IND 222#undef TAG 223