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238 lines
8 KiB
C
238 lines
8 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Antialiased line template.
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*/
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/*
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* Function to render each fragment in the AA line.
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* \param ix - integer fragment window X coordiante
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* \param iy - integer fragment window Y coordiante
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*/
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static void
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NAME(plot)(struct gl_context *ctx, struct LineInfo *line, int ix, int iy)
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{
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const SWcontext *swrast = SWRAST_CONTEXT(ctx);
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const GLfloat fx = (GLfloat) ix;
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const GLfloat fy = (GLfloat) iy;
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const GLfloat coverage = compute_coveragef(line, ix, iy);
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const GLuint i = line->span.end;
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(void) swrast;
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if (coverage == 0.0)
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return;
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line->span.end++;
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line->span.array->coverage[i] = coverage;
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line->span.array->x[i] = ix;
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line->span.array->y[i] = iy;
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/*
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* Compute Z, color, texture coords, fog for the fragment by
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* solving the plane equations at (ix,iy).
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*/
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#ifdef DO_Z
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line->span.array->z[i] = (GLuint) solve_plane(fx, fy, line->zPlane);
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#endif
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line->span.array->rgba[i][RCOMP] = solve_plane_chan(fx, fy, line->rPlane);
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line->span.array->rgba[i][GCOMP] = solve_plane_chan(fx, fy, line->gPlane);
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line->span.array->rgba[i][BCOMP] = solve_plane_chan(fx, fy, line->bPlane);
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line->span.array->rgba[i][ACOMP] = solve_plane_chan(fx, fy, line->aPlane);
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#if defined(DO_ATTRIBS)
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ATTRIB_LOOP_BEGIN
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GLfloat (*attribArray)[4] = line->span.array->attribs[attr];
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if (attr == FRAG_ATTRIB_TEX) {
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/* texcoord w/ divide by Q */
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const GLfloat invQ = solve_plane_recip(fx, fy, line->attrPlane[attr][3]);
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GLuint c;
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for (c = 0; c < 3; c++) {
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attribArray[i][c] = solve_plane(fx, fy, line->attrPlane[attr][c]) * invQ;
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}
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line->span.array->lambda[i]
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= compute_lambda(line->attrPlane[attr][0],
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line->attrPlane[attr][1], invQ,
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line->texWidth[attr], line->texHeight[attr]);
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}
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else {
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/* non-texture attrib */
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const GLfloat invW = solve_plane_recip(fx, fy, line->wPlane);
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GLuint c;
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for (c = 0; c < 4; c++) {
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attribArray[i][c] = solve_plane(fx, fy, line->attrPlane[attr][c]) * invW;
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}
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}
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ATTRIB_LOOP_END
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#endif
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if (line->span.end == MAX_WIDTH) {
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_swrast_write_rgba_span(ctx, &(line->span));
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line->span.end = 0; /* reset counter */
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}
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}
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/*
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* Line setup
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*/
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static void
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NAME(line)(struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1)
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{
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SWcontext *swrast = SWRAST_CONTEXT(ctx);
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GLfloat tStart, tEnd; /* segment start, end along line length */
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GLboolean inSegment;
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GLint iLen, i;
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/* Init the LineInfo struct */
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struct LineInfo line;
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line.x0 = v0->attrib[FRAG_ATTRIB_WPOS][0];
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line.y0 = v0->attrib[FRAG_ATTRIB_WPOS][1];
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line.x1 = v1->attrib[FRAG_ATTRIB_WPOS][0];
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line.y1 = v1->attrib[FRAG_ATTRIB_WPOS][1];
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line.dx = line.x1 - line.x0;
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line.dy = line.y1 - line.y0;
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line.len = SQRTF(line.dx * line.dx + line.dy * line.dy);
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line.halfWidth = 0.5F * CLAMP(ctx->Line.Width,
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ctx->Const.MinLineWidthAA,
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ctx->Const.MaxLineWidthAA);
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if (line.len == 0.0 || IS_INF_OR_NAN(line.len))
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return;
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INIT_SPAN(line.span, GL_LINE);
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line.span.arrayMask = SPAN_XY | SPAN_COVERAGE;
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line.xAdj = line.dx / line.len * line.halfWidth;
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line.yAdj = line.dy / line.len * line.halfWidth;
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#ifdef DO_Z
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line.span.arrayMask |= SPAN_Z;
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compute_plane(line.x0, line.y0, line.x1, line.y1,
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v0->attrib[FRAG_ATTRIB_WPOS][2], v1->attrib[FRAG_ATTRIB_WPOS][2], line.zPlane);
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#endif
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line.span.arrayMask |= SPAN_RGBA;
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if (ctx->Light.ShadeModel == GL_SMOOTH) {
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compute_plane(line.x0, line.y0, line.x1, line.y1,
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v0->color[RCOMP], v1->color[RCOMP], line.rPlane);
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compute_plane(line.x0, line.y0, line.x1, line.y1,
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v0->color[GCOMP], v1->color[GCOMP], line.gPlane);
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compute_plane(line.x0, line.y0, line.x1, line.y1,
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v0->color[BCOMP], v1->color[BCOMP], line.bPlane);
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compute_plane(line.x0, line.y0, line.x1, line.y1,
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v0->color[ACOMP], v1->color[ACOMP], line.aPlane);
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}
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else {
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constant_plane(v1->color[RCOMP], line.rPlane);
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constant_plane(v1->color[GCOMP], line.gPlane);
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constant_plane(v1->color[BCOMP], line.bPlane);
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constant_plane(v1->color[ACOMP], line.aPlane);
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}
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#if defined(DO_ATTRIBS)
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{
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const GLfloat invW0 = v0->attrib[FRAG_ATTRIB_WPOS][3];
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const GLfloat invW1 = v1->attrib[FRAG_ATTRIB_WPOS][3];
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line.span.arrayMask |= SPAN_LAMBDA;
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compute_plane(line.x0, line.y0, line.x1, line.y1, invW0, invW1, line.wPlane);
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ATTRIB_LOOP_BEGIN
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GLuint c;
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if (swrast->_InterpMode[attr] == GL_FLAT) {
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for (c = 0; c < 4; c++) {
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constant_plane(v1->attrib[attr][c], line.attrPlane[attr][c]);
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}
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}
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else {
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for (c = 0; c < 4; c++) {
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const GLfloat a0 = v0->attrib[attr][c] * invW0;
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const GLfloat a1 = v1->attrib[attr][c] * invW1;
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compute_plane(line.x0, line.y0, line.x1, line.y1, a0, a1,
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line.attrPlane[attr][c]);
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}
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}
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line.span.arrayAttribs |= BITFIELD64_BIT(attr);
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if (attr == FRAG_ATTRIB_TEX) {
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const struct gl_texture_object *obj = ctx->Texture.Unit._Current;
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const struct gl_texture_image *texImage = obj->Image[0][obj->BaseLevel];
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line.texWidth[attr] = (GLfloat) texImage->Width;
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line.texHeight[attr] = (GLfloat) texImage->Height;
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}
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ATTRIB_LOOP_END
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}
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#endif
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tStart = tEnd = 0.0;
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inSegment = GL_FALSE;
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iLen = (GLint) line.len;
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if (ctx->Line.StippleFlag) {
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for (i = 0; i < iLen; i++) {
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const GLuint bit = (swrast->StippleCounter / ctx->Line.StippleFactor) & 0xf;
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if ((1 << bit) & ctx->Line.StipplePattern) {
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/* stipple bit is on */
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const GLfloat t = (GLfloat) i / (GLfloat) line.len;
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if (!inSegment) {
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/* start new segment */
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inSegment = GL_TRUE;
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tStart = t;
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}
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else {
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/* still in the segment, extend it */
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tEnd = t;
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}
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}
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else {
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/* stipple bit is off */
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if (inSegment && (tEnd > tStart)) {
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/* draw the segment */
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segment(ctx, &line, NAME(plot), tStart, tEnd);
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inSegment = GL_FALSE;
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}
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else {
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/* still between segments, do nothing */
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}
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}
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swrast->StippleCounter++;
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}
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if (inSegment) {
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/* draw the final segment of the line */
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segment(ctx, &line, NAME(plot), tStart, 1.0F);
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}
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}
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else {
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/* non-stippled */
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segment(ctx, &line, NAME(plot), 0.0, 1.0);
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}
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_swrast_write_rgba_span(ctx, &(line.span));
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}
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#undef DO_Z
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#undef DO_ATTRIBS
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#undef NAME
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