| /* |
| * Mesa 3-D graphics library |
| * Version: 7.1 |
| * |
| * Copyright (C) 1999-2007 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> |
| */ |
| |
| |
| /** |
| * This is where we handle assigning vertex colors based on front/back |
| * facing, compute polygon offset and handle glPolygonMode(). |
| */ |
| static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) |
| { |
| struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
| SScontext *swsetup = SWSETUP_CONTEXT(ctx); |
| SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts; |
| SWvertex *v[3]; |
| GLfloat z[3]; |
| GLfloat offset, oz0, oz1, oz2; |
| GLenum mode = GL_FILL; |
| GLuint facing = 0; |
| GLchan saved_color[3][4]; |
| GLfloat saved_col0[3][4]; |
| GLfloat saved_spec[3][4]; |
| GLfloat saved_index[3]; |
| |
| v[0] = &verts[e0]; |
| v[1] = &verts[e1]; |
| v[2] = &verts[e2]; |
| |
| if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT)) |
| { |
| GLfloat ex = v[0]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0]; |
| GLfloat ey = v[0]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1]; |
| GLfloat fx = v[1]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0]; |
| GLfloat fy = v[1]->attrib[FRAG_ATTRIB_WPOS][1] - v[2]->attrib[FRAG_ATTRIB_WPOS][1]; |
| GLfloat cc = ex*fy - ey*fx; |
| |
| if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)) |
| { |
| facing = (cc < 0.0) ^ ctx->Polygon._FrontBit; |
| |
| if (IND & SS_UNFILLED_BIT) |
| mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode; |
| |
| if (facing == 1) { |
| if (IND & SS_TWOSIDE_BIT) { |
| if (IND & SS_RGBA_BIT) { |
| if (VB->ColorPtr[1]) { |
| GLfloat (*vbcolor)[4] = VB->ColorPtr[1]->data; |
| |
| if (swsetup->intColors) { |
| COPY_CHAN4(saved_color[0], v[0]->color); |
| COPY_CHAN4(saved_color[1], v[1]->color); |
| COPY_CHAN4(saved_color[2], v[2]->color); |
| } |
| else { |
| COPY_4V(saved_col0[0], v[0]->attrib[FRAG_ATTRIB_COL0]); |
| COPY_4V(saved_col0[1], v[1]->attrib[FRAG_ATTRIB_COL0]); |
| COPY_4V(saved_col0[2], v[2]->attrib[FRAG_ATTRIB_COL0]); |
| } |
| |
| if (VB->ColorPtr[1]->stride) { |
| if (swsetup->intColors) { |
| SS_COLOR(v[0]->color, vbcolor[e0]); |
| SS_COLOR(v[1]->color, vbcolor[e1]); |
| SS_COLOR(v[2]->color, vbcolor[e2]); |
| } |
| else { |
| COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[e0]); |
| COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[e1]); |
| COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[e2]); |
| } |
| } |
| else { |
| /* flat shade */ |
| if (swsetup->intColors) { |
| SS_COLOR(v[0]->color, vbcolor[0]); |
| SS_COLOR(v[1]->color, vbcolor[0]); |
| SS_COLOR(v[2]->color, vbcolor[0]); |
| } |
| else { |
| COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); |
| COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); |
| COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], vbcolor[0]); |
| } |
| } |
| } |
| |
| if (VB->SecondaryColorPtr[1]) { |
| GLfloat (*vbspec)[4] = VB->SecondaryColorPtr[1]->data; |
| |
| COPY_4V(saved_spec[0], v[0]->attrib[FRAG_ATTRIB_COL1]); |
| COPY_4V(saved_spec[1], v[1]->attrib[FRAG_ATTRIB_COL1]); |
| COPY_4V(saved_spec[2], v[2]->attrib[FRAG_ATTRIB_COL1]); |
| |
| if (VB->SecondaryColorPtr[1]->stride) { |
| SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[e0]); |
| SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[e1]); |
| SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[e2]); |
| } |
| else { |
| SS_SPEC(v[0]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); |
| SS_SPEC(v[1]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); |
| SS_SPEC(v[2]->attrib[FRAG_ATTRIB_COL1], vbspec[0]); |
| } |
| } |
| } else { |
| GLfloat *vbindex = (GLfloat *)VB->IndexPtr[1]->data; |
| saved_index[0] = v[0]->attrib[FRAG_ATTRIB_CI][0]; |
| saved_index[1] = v[1]->attrib[FRAG_ATTRIB_CI][0]; |
| saved_index[2] = v[2]->attrib[FRAG_ATTRIB_CI][0]; |
| |
| SS_IND(v[0]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e0]); |
| SS_IND(v[1]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e1]); |
| SS_IND(v[2]->attrib[FRAG_ATTRIB_CI][0], (GLuint) vbindex[e2]); |
| } |
| } |
| } |
| } |
| |
| if (IND & SS_OFFSET_BIT) { |
| const GLfloat max = ctx->DrawBuffer->_DepthMaxF; |
| /* save original Z values (restored later) */ |
| z[0] = v[0]->attrib[FRAG_ATTRIB_WPOS][2]; |
| z[1] = v[1]->attrib[FRAG_ATTRIB_WPOS][2]; |
| z[2] = v[2]->attrib[FRAG_ATTRIB_WPOS][2]; |
| /* Note that Z values are already scaled to [0,65535] (for example) |
| * so no MRD value is used here. |
| */ |
| offset = ctx->Polygon.OffsetUnits; |
| if (cc * cc > 1e-16) { |
| const GLfloat ez = z[0] - z[2]; |
| const GLfloat fz = z[1] - z[2]; |
| const GLfloat oneOverArea = 1.0F / cc; |
| const GLfloat dzdx = FABSF((ey * fz - ez * fy) * oneOverArea); |
| const GLfloat dzdy = FABSF((ez * fx - ex * fz) * oneOverArea); |
| offset += MAX2(dzdx, dzdy) * ctx->Polygon.OffsetFactor; |
| } |
| /* new Z values */ |
| oz0 = CLAMP(v[0]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); |
| oz1 = CLAMP(v[1]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); |
| oz2 = CLAMP(v[2]->attrib[FRAG_ATTRIB_WPOS][2] + offset, 0.0, max); |
| } |
| } |
| |
| if (mode == GL_POINT) { |
| if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) { |
| v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; |
| v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; |
| v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; |
| } |
| _swsetup_render_point_tri( ctx, e0, e1, e2, facing ); |
| } else if (mode == GL_LINE) { |
| if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) { |
| v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; |
| v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; |
| v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; |
| } |
| _swsetup_render_line_tri( ctx, e0, e1, e2, facing ); |
| } else { |
| if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) { |
| v[0]->attrib[FRAG_ATTRIB_WPOS][2] = oz0; |
| v[1]->attrib[FRAG_ATTRIB_WPOS][2] = oz1; |
| v[2]->attrib[FRAG_ATTRIB_WPOS][2] = oz2; |
| } |
| _swrast_Triangle( ctx, v[0], v[1], v[2] ); |
| } |
| |
| /* |
| * Restore original vertex colors, etc. |
| */ |
| if (IND & SS_OFFSET_BIT) { |
| v[0]->attrib[FRAG_ATTRIB_WPOS][2] = z[0]; |
| v[1]->attrib[FRAG_ATTRIB_WPOS][2] = z[1]; |
| v[2]->attrib[FRAG_ATTRIB_WPOS][2] = z[2]; |
| } |
| |
| if (IND & SS_TWOSIDE_BIT) { |
| if (facing == 1) { |
| if (IND & SS_RGBA_BIT) { |
| if (VB->ColorPtr[1]) { |
| if (swsetup->intColors) { |
| COPY_CHAN4(v[0]->color, saved_color[0]); |
| COPY_CHAN4(v[1]->color, saved_color[1]); |
| COPY_CHAN4(v[2]->color, saved_color[2]); |
| } |
| else { |
| COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL0], saved_col0[0]); |
| COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL0], saved_col0[1]); |
| COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL0], saved_col0[2]); |
| } |
| } |
| |
| if (VB->SecondaryColorPtr[1]) { |
| COPY_4V(v[0]->attrib[FRAG_ATTRIB_COL1], saved_spec[0]); |
| COPY_4V(v[1]->attrib[FRAG_ATTRIB_COL1], saved_spec[1]); |
| COPY_4V(v[2]->attrib[FRAG_ATTRIB_COL1], saved_spec[2]); |
| } |
| } else { |
| v[0]->attrib[FRAG_ATTRIB_CI][0] = saved_index[0]; |
| v[1]->attrib[FRAG_ATTRIB_CI][0] = saved_index[1]; |
| v[2]->attrib[FRAG_ATTRIB_CI][0] = saved_index[2]; |
| } |
| } |
| } |
| } |
| |
| |
| |
| /* Need to fixup edgeflags when decomposing to triangles: |
| */ |
| static void TAG(quadfunc)( GLcontext *ctx, GLuint v0, |
| GLuint v1, GLuint v2, GLuint v3 ) |
| { |
| if (IND & SS_UNFILLED_BIT) { |
| struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
| if (VB->EdgeFlag) { /* XXX this test shouldn't be needed (bug 12614) */ |
| GLubyte ef1 = VB->EdgeFlag[v1]; |
| GLubyte ef3 = VB->EdgeFlag[v3]; |
| VB->EdgeFlag[v1] = 0; |
| TAG(triangle)( ctx, v0, v1, v3 ); |
| VB->EdgeFlag[v1] = ef1; |
| VB->EdgeFlag[v3] = 0; |
| TAG(triangle)( ctx, v1, v2, v3 ); |
| VB->EdgeFlag[v3] = ef3; |
| } |
| } else { |
| TAG(triangle)( ctx, v0, v1, v3 ); |
| TAG(triangle)( ctx, v1, v2, v3 ); |
| } |
| } |
| |
| |
| |
| |
| static void TAG(init)( void ) |
| { |
| tri_tab[IND] = TAG(triangle); |
| quad_tab[IND] = TAG(quadfunc); |
| } |
| |
| |
| #undef IND |
| #undef TAG |
