ss_tritmp.h revision 0a9187801505130738ae947c69cafa8a1dd118d1
1/* 2 * Mesa 3-D graphics library 3 * Version: 7.1 4 * 5 * Copyright (C) 1999-2007 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 29/** 30 * This is where we handle assigning vertex colors based on front/back 31 * facing, compute polygon offset and handle glPolygonMode(). 32 */ 33static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) 34{ 35 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 36 SScontext *swsetup = SWSETUP_CONTEXT(ctx); 37 SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts; 38 SWvertex *v[3]; 39 GLfloat z[3]; 40 GLfloat offset, oz0, oz1, oz2; 41 GLenum mode = GL_FILL; 42 GLuint facing = 0; 43 GLchan saved_color[3][4]; 44 GLfloat saved_col0[3][4]; 45 GLfloat saved_spec[3][4]; 46 GLfloat saved_index[3]; 47 48 v[0] = &verts[e0]; 49 v[1] = &verts[e1]; 50 v[2] = &verts[e2]; 51 52 if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT)) 53 { 54 GLfloat ex = v[0]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0]; 55 GLfloat ey = v[0]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1]; 56 GLfloat fx = v[1]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0]; 57 GLfloat fy = v[1]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1]; 58 GLfloat cc = ex*fy - ey*fx; 59 60 if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)) 61 { 62 facing = (cc < 0.0) ^ ctx->Polygon._FrontBit; 63 64 if (IND & SS_UNFILLED_BIT) 65 mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode; 66 67 if (facing == 1) { 68 if (IND & SS_TWOSIDE_BIT) { 69 if (IND & SS_RGBA_BIT) { 70 if (VB->BackfaceColorPtr) { 71 GLfloat (*vbcolor)[4] = VB->BackfaceColorPtr->data; 72 73 if (swsetup->intColors) { 74 COPY_CHAN4(saved_color[0], v[0]->color); 75 COPY_CHAN4(saved_color[1], v[1]->color); 76 COPY_CHAN4(saved_color[2], v[2]->color); 77 } 78 else { 79 COPY_4V(saved_col0[0], v[0]->attrib[FRAG_ATTRIB_COL0]); 80 COPY_4V(saved_col0[1], v[1]->attrib[FRAG_ATTRIB_COL0]); 81 COPY_4V(saved_col0[2], v[2]->attrib[FRAG_ATTRIB_COL0]); 82 } 83 84 if (VB->BackfaceColorPtr->stride) { 85 if (swsetup->intColors) { 86 SS_COLOR(v[0]->color, vbcolor[e0]); 87 SS_COLOR(v[1]->color, vbcolor[e1]); 88 SS_COLOR(v[2]->color, vbcolor[e2]); 89 } 90 else { 91 COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[e0]); 92 COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[e1]); 93 COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[e2]); 94 } 95 } 96 else { 97 /* flat shade */ 98 if (swsetup->intColors) { 99 SS_COLOR(v[0]->color, vbcolor[0]); 100 SS_COLOR(v[1]->color, vbcolor[0]); 101 SS_COLOR(v[2]->color, vbcolor[0]); 102 } 103 else { 104 COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); 105 COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); 106 COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); 107 } 108 } 109 } 110 111 if (VB->BackfaceSecondaryColorPtr) { 112 GLfloat (*vbspec)[4] = VB->BackfaceSecondaryColorPtr->data; 113 114 COPY_4V(saved_spec[0], v[0]->attrib[FRAG_ATTRIB_COL1]); 115 COPY_4V(saved_spec[1], v[1]->attrib[FRAG_ATTRIB_COL1]); 116 COPY_4V(saved_spec[2], v[2]->attrib[FRAG_ATTRIB_COL1]); 117 118 if (VB->BackfaceSecondaryColorPtr->stride) { 119 SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[e0]); 120 SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[e1]); 121 SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[e2]); 122 } 123 else { 124 SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); 125 SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); 126 SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); 127 } 128 } 129 } else { 130 GLfloat *vbindex = (GLfloat *)VB->BackfaceIndexPtr->data; 131 saved_index[0] = v[0]->attrib[FRAG_ATTRIB_CI][0]; 132 saved_index[1] = v[1]->attrib[FRAG_ATTRIB_CI][0]; 133 saved_index[2] = v[2]->attrib[FRAG_ATTRIB_CI][0]; 134 135 SS_IND(v[0]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e0]); 136 SS_IND(v[1]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e1]); 137 SS_IND(v[2]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e2]); 138 } 139 } 140 } 141 } 142 143 if (IND & SS_OFFSET_BIT) { 144 const GLfloat max = ctx->DrawBuffer->_DepthMaxF; 145 /* save original Z values (restored later) */ 146 z[0] = v[0]->attrib[FRAG_ATTRIB_WPOS][2]; 147 z[1] = v[1]->attrib[FRAG_ATTRIB_WPOS][2]; 148 z[2] = v[2]->attrib[FRAG_ATTRIB_WPOS][2]; 149 /* Note that Z values are already scaled to [0,65535] (for example) 150 * so no MRD value is used here. 151 */ 152 offset = ctx->Polygon.OffsetUnits; 153 if (cc * cc > 1e-16) { 154 const GLfloat ez = z[0] - z[2]; 155 const GLfloat fz = z[1] - z[2]; 156 const GLfloat oneOverArea = 1.0F / cc; 157 const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea); 158 const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea); 159 offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor; 160 } 161 /* new Z values */ 162 oz0 = CLAMP(v[0]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); 163 oz1 = CLAMP(v[1]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); 164 oz2 = CLAMP(v[2]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); 165 } 166 } 167 168 if (mode == GL_POINT) { 169 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) { 170 v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; 171 v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; 172 v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; 173 } 174 _swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_point_tri); 175 } else if (mode == GL_LINE) { 176 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) { 177 v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; 178 v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; 179 v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; 180 } 181 _swsetup_render_tri(ctx, e0, e1, e2, facing, _swsetup_edge_render_line_tri); 182 } else { 183 if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) { 184 v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; 185 v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; 186 v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; 187 } 188 _swrast_Triangle( ctx, v[0], v[1], v[2] ); 189 } 190 191 /* 192 * Restore original vertex colors, etc. 193 */ 194 if (IND & SS_OFFSET_BIT) { 195 v[0]->attrib[FRAG_ATTRIB_WPOS][2] = z[0]; 196 v[1]->attrib[FRAG_ATTRIB_WPOS][2] = z[1]; 197 v[2]->attrib[FRAG_ATTRIB_WPOS][2] = z[2]; 198 } 199 200 if (IND & SS_TWOSIDE_BIT) { 201 if (facing == 1) { 202 if (IND & SS_RGBA_BIT) { 203 if (VB->BackfaceColorPtr) { 204 if (swsetup->intColors) { 205 COPY_CHAN4(v[0]->color, saved_color[0]); 206 COPY_CHAN4(v[1]->color, saved_color[1]); 207 COPY_CHAN4(v[2]->color, saved_color[2]); 208 } 209 else { 210 COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], saved_col0[0]); 211 COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], saved_col0[1]); 212 COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], saved_col0[2]); 213 } 214 } 215 216 if (VB->BackfaceSecondaryColorPtr) { 217 COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL1], saved_spec[0]); 218 COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL1], saved_spec[1]); 219 COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL1], saved_spec[2]); 220 } 221 } else { 222 v[0]->attrib[FRAG_ATTRIB_CI][0] = saved_index[0]; 223 v[1]->attrib[FRAG_ATTRIB_CI][0] = saved_index[1]; 224 v[2]->attrib[FRAG_ATTRIB_CI][0] = saved_index[2]; 225 } 226 } 227 } 228} 229 230 231 232/* Need to fixup edgeflags when decomposing to triangles: 233 */ 234static void TAG(quadfunc)( GLcontext *ctx, GLuint v0, 235 GLuint v1, GLuint v2, GLuint v3 ) 236{ 237 if (IND & SS_UNFILLED_BIT) { 238 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 239 if (VB->EdgeFlag) { /* XXX this test shouldn't be needed (bug 12614) */ 240 GLubyte ef1 = VB->EdgeFlag[v1]; 241 GLubyte ef3 = VB->EdgeFlag[v3]; 242 VB->EdgeFlag[v1] = 0; 243 TAG(triangle)( ctx, v0, v1, v3 ); 244 VB->EdgeFlag[v1] = ef1; 245 VB->EdgeFlag[v3] = 0; 246 TAG(triangle)( ctx, v1, v2, v3 ); 247 VB->EdgeFlag[v3] = ef3; 248 } 249 } else { 250 TAG(triangle)( ctx, v0, v1, v3 ); 251 TAG(triangle)( ctx, v1, v2, v3 ); 252 } 253} 254 255 256 257 258static void TAG(init)( void ) 259{ 260 tri_tab[IND] = TAG(triangle); 261 quad_tab[IND] = TAG(quadfunc); 262} 263 264 265#undef IND 266#undef TAG 267