xserver and mesa git update 28-12-2010

1 files changed, 331 insertions, 331 deletions

diff --git a/mesalib/src/mesa/swrast/s_aatritemp.h b/mesalib/src/mesa/swrast/s_aatritemp.h
index 5c1c6d904..4136df3a7 100644
--- a/mesalib/src/mesa/swrast/s_aatritemp.h
+++ b/mesalib/src/mesa/swrast/s_aatritemp.h
@@ -1,331 +1,331 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.0.3
- *
- * 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.
- */
-
-
-/*
- * Antialiased Triangle Rasterizer Template
- *
- * This file is #include'd to generate custom AA triangle rasterizers.
- * NOTE: this code hasn't been optimized yet.  That'll come after it
- * works correctly.
- *
- * The following macros may be defined to indicate what auxillary information
- * must be copmuted across the triangle:
- *    DO_Z         - if defined, compute Z values
- *    DO_ATTRIBS   - if defined, compute texcoords, varying, etc.
- */
-
-/*void triangle( GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv )*/
-{
-   const SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   const GLfloat *p0 = v0->attrib[FRAG_ATTRIB_WPOS];
-   const GLfloat *p1 = v1->attrib[FRAG_ATTRIB_WPOS];
-   const GLfloat *p2 = v2->attrib[FRAG_ATTRIB_WPOS];
-   const SWvertex *vMin, *vMid, *vMax;
-   GLint iyMin, iyMax;
-   GLfloat yMin, yMax;
-   GLboolean ltor;
-   GLfloat majDx, majDy;  /* major (i.e. long) edge dx and dy */
-   
-   SWspan span;
-   
-#ifdef DO_Z
-   GLfloat zPlane[4];
-#endif
-   GLfloat rPlane[4], gPlane[4], bPlane[4], aPlane[4];
-#if defined(DO_ATTRIBS)
-   GLfloat attrPlane[FRAG_ATTRIB_MAX][4][4];
-   GLfloat wPlane[4];  /* win[3] */
-#endif
-   GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;
-   
-   (void) swrast;
-
-   INIT_SPAN(span, GL_POLYGON);
-   span.arrayMask = SPAN_COVERAGE;
-
-   /* determine bottom to top order of vertices */
-   {
-      GLfloat y0 = v0->attrib[FRAG_ATTRIB_WPOS][1];
-      GLfloat y1 = v1->attrib[FRAG_ATTRIB_WPOS][1];
-      GLfloat y2 = v2->attrib[FRAG_ATTRIB_WPOS][1];
-      if (y0 <= y1) {
-	 if (y1 <= y2) {
-	    vMin = v0;   vMid = v1;   vMax = v2;   /* y0<=y1<=y2 */
-	 }
-	 else if (y2 <= y0) {
-	    vMin = v2;   vMid = v0;   vMax = v1;   /* y2<=y0<=y1 */
-	 }
-	 else {
-	    vMin = v0;   vMid = v2;   vMax = v1;  bf = -bf; /* y0<=y2<=y1 */
-	 }
-      }
-      else {
-	 if (y0 <= y2) {
-	    vMin = v1;   vMid = v0;   vMax = v2;  bf = -bf; /* y1<=y0<=y2 */
-	 }
-	 else if (y2 <= y1) {
-	    vMin = v2;   vMid = v1;   vMax = v0;  bf = -bf; /* y2<=y1<=y0 */
-	 }
-	 else {
-	    vMin = v1;   vMid = v2;   vMax = v0;   /* y1<=y2<=y0 */
-	 }
-      }
-   }
-
-   majDx = vMax->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];
-   majDy = vMax->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];
-
-   /* front/back-face determination and cullling */
-   {
-      const GLfloat botDx = vMid->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];
-      const GLfloat botDy = vMid->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];
-      const GLfloat area = majDx * botDy - botDx * majDy;
-      /* Do backface culling */
-      if (area * bf < 0 || area == 0 || IS_INF_OR_NAN(area))
-	 return;
-      ltor = (GLboolean) (area < 0.0F);
-
-      span.facing = area * swrast->_BackfaceSign > 0.0F;
-   }
-
-   /* Plane equation setup:
-    * We evaluate plane equations at window (x,y) coordinates in order
-    * to compute color, Z, fog, texcoords, etc.  This isn't terribly
-    * efficient but it's easy and reliable.
-    */
-#ifdef DO_Z
-   compute_plane(p0, p1, p2, p0[2], p1[2], p2[2], zPlane);
-   span.arrayMask |= SPAN_Z;
-#endif
-   if (ctx->Light.ShadeModel == GL_SMOOTH) {
-      compute_plane(p0, p1, p2, v0->color[RCOMP], v1->color[RCOMP], v2->color[RCOMP], rPlane);
-      compute_plane(p0, p1, p2, v0->color[GCOMP], v1->color[GCOMP], v2->color[GCOMP], gPlane);
-      compute_plane(p0, p1, p2, v0->color[BCOMP], v1->color[BCOMP], v2->color[BCOMP], bPlane);
-      compute_plane(p0, p1, p2, v0->color[ACOMP], v1->color[ACOMP], v2->color[ACOMP], aPlane);
-   }
-   else {
-      constant_plane(v2->color[RCOMP], rPlane);
-      constant_plane(v2->color[GCOMP], gPlane);
-      constant_plane(v2->color[BCOMP], bPlane);
-      constant_plane(v2->color[ACOMP], aPlane);
-   }
-   span.arrayMask |= SPAN_RGBA;
-#if defined(DO_ATTRIBS)
-   {
-      const GLfloat invW0 = v0->attrib[FRAG_ATTRIB_WPOS][3];
-      const GLfloat invW1 = v1->attrib[FRAG_ATTRIB_WPOS][3];
-      const GLfloat invW2 = v2->attrib[FRAG_ATTRIB_WPOS][3];
-      compute_plane(p0, p1, p2, invW0, invW1, invW2, wPlane);
-      span.attrStepX[FRAG_ATTRIB_WPOS][3] = plane_dx(wPlane);
-      span.attrStepY[FRAG_ATTRIB_WPOS][3] = plane_dy(wPlane);
-      ATTRIB_LOOP_BEGIN
-         GLuint c;
-         if (swrast->_InterpMode[attr] == GL_FLAT) {
-            for (c = 0; c < 4; c++) {
-               constant_plane(v2->attrib[attr][c] * invW2, attrPlane[attr][c]);
-            }
-         }
-         else {
-            for (c = 0; c < 4; c++) {
-               const GLfloat a0 = v0->attrib[attr][c] * invW0;
-               const GLfloat a1 = v1->attrib[attr][c] * invW1;
-               const GLfloat a2 = v2->attrib[attr][c] * invW2;
-               compute_plane(p0, p1, p2, a0, a1, a2, attrPlane[attr][c]);
-            }
-         }
-         for (c = 0; c < 4; c++) {
-            span.attrStepX[attr][c] = plane_dx(attrPlane[attr][c]);
-            span.attrStepY[attr][c] = plane_dy(attrPlane[attr][c]);
-         }
-      ATTRIB_LOOP_END
-   }
-#endif
-
-   /* Begin bottom-to-top scan over the triangle.
-    * The long edge will either be on the left or right side of the
-    * triangle.  We always scan from the long edge toward the shorter
-    * edges, stopping when we find that coverage = 0.  If the long edge
-    * is on the left we scan left-to-right.  Else, we scan right-to-left.
-    */
-   yMin = vMin->attrib[FRAG_ATTRIB_WPOS][1];
-   yMax = vMax->attrib[FRAG_ATTRIB_WPOS][1];
-   iyMin = (GLint) yMin;
-   iyMax = (GLint) yMax + 1;
-
-   if (ltor) {
-      /* scan left to right */
-      const GLfloat *pMin = vMin->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat *pMid = vMid->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat *pMax = vMax->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat dxdy = majDx / majDy;
-      const GLfloat xAdj = dxdy < 0.0F ? -dxdy : 0.0F;
-      GLfloat x = pMin[0] - (yMin - iyMin) * dxdy;
-      GLint iy;
-      for (iy = iyMin; iy < iyMax; iy++, x += dxdy) {
-         GLint ix, startX = (GLint) (x - xAdj);
-         GLuint count;
-         GLfloat coverage = 0.0F;
-
-         /* skip over fragments with zero coverage */
-         while (startX < MAX_WIDTH) {
-            coverage = compute_coveragef(pMin, pMid, pMax, startX, iy);
-            if (coverage > 0.0F)
-               break;
-            startX++;
-         }
-
-         /* enter interior of triangle */
-         ix = startX;
-
-#if defined(DO_ATTRIBS)
-         /* compute attributes at left-most fragment */
-         span.attrStart[FRAG_ATTRIB_WPOS][3] = solve_plane(ix + 0.5F, iy + 0.5F, wPlane);
-         ATTRIB_LOOP_BEGIN
-            GLuint c;
-            for (c = 0; c < 4; c++) {
-               span.attrStart[attr][c] = solve_plane(ix + 0.5F, iy + 0.5F, attrPlane[attr][c]);
-            }
-         ATTRIB_LOOP_END
-#endif
-
-         count = 0;
-         while (coverage > 0.0F) {
-            /* (cx,cy) = center of fragment */
-            const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;
-            SWspanarrays *array = span.array;
-            array->coverage[count] = coverage;
-#ifdef DO_Z
-            array->z[count] = (GLuint) solve_plane(cx, cy, zPlane);
-#endif
-            array->rgba[count][RCOMP] = solve_plane_chan(cx, cy, rPlane);
-            array->rgba[count][GCOMP] = solve_plane_chan(cx, cy, gPlane);
-            array->rgba[count][BCOMP] = solve_plane_chan(cx, cy, bPlane);
-            array->rgba[count][ACOMP] = solve_plane_chan(cx, cy, aPlane);
-            ix++;
-            count++;
-            coverage = compute_coveragef(pMin, pMid, pMax, ix, iy);
-         }
-         
-         if (ix <= startX)
-            continue;
-         
-         span.x = startX;
-         span.y = iy;
-         span.end = (GLuint) ix - (GLuint) startX;
-         _swrast_write_rgba_span(ctx, &span);
-      }
-   }
-   else {
-      /* scan right to left */
-      const GLfloat *pMin = vMin->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat *pMid = vMid->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat *pMax = vMax->attrib[FRAG_ATTRIB_WPOS];
-      const GLfloat dxdy = majDx / majDy;
-      const GLfloat xAdj = dxdy > 0 ? dxdy : 0.0F;
-      GLfloat x = pMin[0] - (yMin - iyMin) * dxdy;
-      GLint iy;
-      for (iy = iyMin; iy < iyMax; iy++, x += dxdy) {
-         GLint ix, left, startX = (GLint) (x + xAdj);
-         GLuint count, n;
-         GLfloat coverage = 0.0F;
-         
-         /* make sure we're not past the window edge */
-         if (startX >= ctx->DrawBuffer->_Xmax) {
-            startX = ctx->DrawBuffer->_Xmax - 1;
-         }
-
-         /* skip fragments with zero coverage */
-         while (startX > 0) {
-            coverage = compute_coveragef(pMin, pMax, pMid, startX, iy);
-            if (coverage > 0.0F)
-               break;
-            startX--;
-         }
-         
-         /* enter interior of triangle */
-         ix = startX;
-         count = 0;
-         while (coverage > 0.0F) {
-            /* (cx,cy) = center of fragment */
-            const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;
-            SWspanarrays *array = span.array;
-            ASSERT(ix >= 0);
-            array->coverage[ix] = coverage;
-#ifdef DO_Z
-            array->z[ix] = (GLuint) solve_plane(cx, cy, zPlane);
-#endif
-            array->rgba[ix][RCOMP] = solve_plane_chan(cx, cy, rPlane);
-            array->rgba[ix][GCOMP] = solve_plane_chan(cx, cy, gPlane);
-            array->rgba[ix][BCOMP] = solve_plane_chan(cx, cy, bPlane);
-            array->rgba[ix][ACOMP] = solve_plane_chan(cx, cy, aPlane);
-            ix--;
-            count++;
-            coverage = compute_coveragef(pMin, pMax, pMid, ix, iy);
-         }
-         
-#if defined(DO_ATTRIBS)
-         /* compute attributes at left-most fragment */
-         span.attrStart[FRAG_ATTRIB_WPOS][3] = solve_plane(ix + 1.5F, iy + 0.5F, wPlane);
-         ATTRIB_LOOP_BEGIN
-            GLuint c;
-            for (c = 0; c < 4; c++) {
-               span.attrStart[attr][c] = solve_plane(ix + 1.5F, iy + 0.5F, attrPlane[attr][c]);
-            }
-         ATTRIB_LOOP_END
-#endif
-
-         if (startX <= ix)
-            continue;
-
-         n = (GLuint) startX - (GLuint) ix;
-
-         left = ix + 1;
-
-         /* shift all values to the left */
-         /* XXX this is temporary */
-         {
-            SWspanarrays *array = span.array;
-            GLint j;
-            for (j = 0; j < (GLint) n; j++) {
-               array->coverage[j] = array->coverage[j + left];
-               COPY_CHAN4(array->rgba[j], array->rgba[j + left]);
-#ifdef DO_Z
-               array->z[j] = array->z[j + left];
-#endif
-            }
-         }
-
-         span.x = left;
-         span.y = iy;
-         span.end = n;
-         _swrast_write_rgba_span(ctx, &span);
-      }
-   }
-}
-
-
-#undef DO_Z
-#undef DO_ATTRIBS
-#undef DO_OCCLUSION_TEST
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.0.3

+ *

+ * 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.

+ */

+

+

+/*

+ * Antialiased Triangle Rasterizer Template

+ *

+ * This file is #include'd to generate custom AA triangle rasterizers.

+ * NOTE: this code hasn't been optimized yet.  That'll come after it

+ * works correctly.

+ *

+ * The following macros may be defined to indicate what auxillary information

+ * must be copmuted across the triangle:

+ *    DO_Z         - if defined, compute Z values

+ *    DO_ATTRIBS   - if defined, compute texcoords, varying, etc.

+ */

+

+/*void triangle( struct gl_context *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint pv )*/

+{

+   const SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   const GLfloat *p0 = v0->attrib[FRAG_ATTRIB_WPOS];

+   const GLfloat *p1 = v1->attrib[FRAG_ATTRIB_WPOS];

+   const GLfloat *p2 = v2->attrib[FRAG_ATTRIB_WPOS];

+   const SWvertex *vMin, *vMid, *vMax;

+   GLint iyMin, iyMax;

+   GLfloat yMin, yMax;

+   GLboolean ltor;

+   GLfloat majDx, majDy;  /* major (i.e. long) edge dx and dy */

+   

+   SWspan span;

+   

+#ifdef DO_Z

+   GLfloat zPlane[4];

+#endif

+   GLfloat rPlane[4], gPlane[4], bPlane[4], aPlane[4];

+#if defined(DO_ATTRIBS)

+   GLfloat attrPlane[FRAG_ATTRIB_MAX][4][4];

+   GLfloat wPlane[4];  /* win[3] */

+#endif

+   GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;

+   

+   (void) swrast;

+

+   INIT_SPAN(span, GL_POLYGON);

+   span.arrayMask = SPAN_COVERAGE;

+

+   /* determine bottom to top order of vertices */

+   {

+      GLfloat y0 = v0->attrib[FRAG_ATTRIB_WPOS][1];

+      GLfloat y1 = v1->attrib[FRAG_ATTRIB_WPOS][1];

+      GLfloat y2 = v2->attrib[FRAG_ATTRIB_WPOS][1];

+      if (y0 <= y1) {

+	 if (y1 <= y2) {

+	    vMin = v0;   vMid = v1;   vMax = v2;   /* y0<=y1<=y2 */

+	 }

+	 else if (y2 <= y0) {

+	    vMin = v2;   vMid = v0;   vMax = v1;   /* y2<=y0<=y1 */

+	 }

+	 else {

+	    vMin = v0;   vMid = v2;   vMax = v1;  bf = -bf; /* y0<=y2<=y1 */

+	 }

+      }

+      else {

+	 if (y0 <= y2) {

+	    vMin = v1;   vMid = v0;   vMax = v2;  bf = -bf; /* y1<=y0<=y2 */

+	 }

+	 else if (y2 <= y1) {

+	    vMin = v2;   vMid = v1;   vMax = v0;  bf = -bf; /* y2<=y1<=y0 */

+	 }

+	 else {

+	    vMin = v1;   vMid = v2;   vMax = v0;   /* y1<=y2<=y0 */

+	 }

+      }

+   }

+

+   majDx = vMax->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];

+   majDy = vMax->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];

+

+   /* front/back-face determination and cullling */

+   {

+      const GLfloat botDx = vMid->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];

+      const GLfloat botDy = vMid->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];

+      const GLfloat area = majDx * botDy - botDx * majDy;

+      /* Do backface culling */

+      if (area * bf < 0 || area == 0 || IS_INF_OR_NAN(area))

+	 return;

+      ltor = (GLboolean) (area < 0.0F);

+

+      span.facing = area * swrast->_BackfaceSign > 0.0F;

+   }

+

+   /* Plane equation setup:

+    * We evaluate plane equations at window (x,y) coordinates in order

+    * to compute color, Z, fog, texcoords, etc.  This isn't terribly

+    * efficient but it's easy and reliable.

+    */

+#ifdef DO_Z

+   compute_plane(p0, p1, p2, p0[2], p1[2], p2[2], zPlane);

+   span.arrayMask |= SPAN_Z;

+#endif

+   if (ctx->Light.ShadeModel == GL_SMOOTH) {

+      compute_plane(p0, p1, p2, v0->color[RCOMP], v1->color[RCOMP], v2->color[RCOMP], rPlane);

+      compute_plane(p0, p1, p2, v0->color[GCOMP], v1->color[GCOMP], v2->color[GCOMP], gPlane);

+      compute_plane(p0, p1, p2, v0->color[BCOMP], v1->color[BCOMP], v2->color[BCOMP], bPlane);

+      compute_plane(p0, p1, p2, v0->color[ACOMP], v1->color[ACOMP], v2->color[ACOMP], aPlane);

+   }

+   else {

+      constant_plane(v2->color[RCOMP], rPlane);

+      constant_plane(v2->color[GCOMP], gPlane);

+      constant_plane(v2->color[BCOMP], bPlane);

+      constant_plane(v2->color[ACOMP], aPlane);

+   }

+   span.arrayMask |= SPAN_RGBA;

+#if defined(DO_ATTRIBS)

+   {

+      const GLfloat invW0 = v0->attrib[FRAG_ATTRIB_WPOS][3];

+      const GLfloat invW1 = v1->attrib[FRAG_ATTRIB_WPOS][3];

+      const GLfloat invW2 = v2->attrib[FRAG_ATTRIB_WPOS][3];

+      compute_plane(p0, p1, p2, invW0, invW1, invW2, wPlane);

+      span.attrStepX[FRAG_ATTRIB_WPOS][3] = plane_dx(wPlane);

+      span.attrStepY[FRAG_ATTRIB_WPOS][3] = plane_dy(wPlane);

+      ATTRIB_LOOP_BEGIN

+         GLuint c;

+         if (swrast->_InterpMode[attr] == GL_FLAT) {

+            for (c = 0; c < 4; c++) {

+               constant_plane(v2->attrib[attr][c] * invW2, attrPlane[attr][c]);

+            }

+         }

+         else {

+            for (c = 0; c < 4; c++) {

+               const GLfloat a0 = v0->attrib[attr][c] * invW0;

+               const GLfloat a1 = v1->attrib[attr][c] * invW1;

+               const GLfloat a2 = v2->attrib[attr][c] * invW2;

+               compute_plane(p0, p1, p2, a0, a1, a2, attrPlane[attr][c]);

+            }

+         }

+         for (c = 0; c < 4; c++) {

+            span.attrStepX[attr][c] = plane_dx(attrPlane[attr][c]);

+            span.attrStepY[attr][c] = plane_dy(attrPlane[attr][c]);

+         }

+      ATTRIB_LOOP_END

+   }

+#endif

+

+   /* Begin bottom-to-top scan over the triangle.

+    * The long edge will either be on the left or right side of the

+    * triangle.  We always scan from the long edge toward the shorter

+    * edges, stopping when we find that coverage = 0.  If the long edge

+    * is on the left we scan left-to-right.  Else, we scan right-to-left.

+    */

+   yMin = vMin->attrib[FRAG_ATTRIB_WPOS][1];

+   yMax = vMax->attrib[FRAG_ATTRIB_WPOS][1];

+   iyMin = (GLint) yMin;

+   iyMax = (GLint) yMax + 1;

+

+   if (ltor) {

+      /* scan left to right */

+      const GLfloat *pMin = vMin->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat *pMid = vMid->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat *pMax = vMax->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat dxdy = majDx / majDy;

+      const GLfloat xAdj = dxdy < 0.0F ? -dxdy : 0.0F;

+      GLfloat x = pMin[0] - (yMin - iyMin) * dxdy;

+      GLint iy;

+      for (iy = iyMin; iy < iyMax; iy++, x += dxdy) {

+         GLint ix, startX = (GLint) (x - xAdj);

+         GLuint count;

+         GLfloat coverage = 0.0F;

+

+         /* skip over fragments with zero coverage */

+         while (startX < MAX_WIDTH) {

+            coverage = compute_coveragef(pMin, pMid, pMax, startX, iy);

+            if (coverage > 0.0F)

+               break;

+            startX++;

+         }

+

+         /* enter interior of triangle */

+         ix = startX;

+

+#if defined(DO_ATTRIBS)

+         /* compute attributes at left-most fragment */

+         span.attrStart[FRAG_ATTRIB_WPOS][3] = solve_plane(ix + 0.5F, iy + 0.5F, wPlane);

+         ATTRIB_LOOP_BEGIN

+            GLuint c;

+            for (c = 0; c < 4; c++) {

+               span.attrStart[attr][c] = solve_plane(ix + 0.5F, iy + 0.5F, attrPlane[attr][c]);

+            }

+         ATTRIB_LOOP_END

+#endif

+

+         count = 0;

+         while (coverage > 0.0F) {

+            /* (cx,cy) = center of fragment */

+            const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;

+            SWspanarrays *array = span.array;

+            array->coverage[count] = coverage;

+#ifdef DO_Z

+            array->z[count] = (GLuint) solve_plane(cx, cy, zPlane);

+#endif

+            array->rgba[count][RCOMP] = solve_plane_chan(cx, cy, rPlane);

+            array->rgba[count][GCOMP] = solve_plane_chan(cx, cy, gPlane);

+            array->rgba[count][BCOMP] = solve_plane_chan(cx, cy, bPlane);

+            array->rgba[count][ACOMP] = solve_plane_chan(cx, cy, aPlane);

+            ix++;

+            count++;

+            coverage = compute_coveragef(pMin, pMid, pMax, ix, iy);

+         }

+         

+         if (ix <= startX)

+            continue;

+         

+         span.x = startX;

+         span.y = iy;

+         span.end = (GLuint) ix - (GLuint) startX;

+         _swrast_write_rgba_span(ctx, &span);

+      }

+   }

+   else {

+      /* scan right to left */

+      const GLfloat *pMin = vMin->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat *pMid = vMid->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat *pMax = vMax->attrib[FRAG_ATTRIB_WPOS];

+      const GLfloat dxdy = majDx / majDy;

+      const GLfloat xAdj = dxdy > 0 ? dxdy : 0.0F;

+      GLfloat x = pMin[0] - (yMin - iyMin) * dxdy;

+      GLint iy;

+      for (iy = iyMin; iy < iyMax; iy++, x += dxdy) {

+         GLint ix, left, startX = (GLint) (x + xAdj);

+         GLuint count, n;

+         GLfloat coverage = 0.0F;

+         

+         /* make sure we're not past the window edge */

+         if (startX >= ctx->DrawBuffer->_Xmax) {

+            startX = ctx->DrawBuffer->_Xmax - 1;

+         }

+

+         /* skip fragments with zero coverage */

+         while (startX > 0) {

+            coverage = compute_coveragef(pMin, pMax, pMid, startX, iy);

+            if (coverage > 0.0F)

+               break;

+            startX--;

+         }

+         

+         /* enter interior of triangle */

+         ix = startX;

+         count = 0;

+         while (coverage > 0.0F) {

+            /* (cx,cy) = center of fragment */

+            const GLfloat cx = ix + 0.5F, cy = iy + 0.5F;

+            SWspanarrays *array = span.array;

+            ASSERT(ix >= 0);

+            array->coverage[ix] = coverage;

+#ifdef DO_Z

+            array->z[ix] = (GLuint) solve_plane(cx, cy, zPlane);

+#endif

+            array->rgba[ix][RCOMP] = solve_plane_chan(cx, cy, rPlane);

+            array->rgba[ix][GCOMP] = solve_plane_chan(cx, cy, gPlane);

+            array->rgba[ix][BCOMP] = solve_plane_chan(cx, cy, bPlane);

+            array->rgba[ix][ACOMP] = solve_plane_chan(cx, cy, aPlane);

+            ix--;

+            count++;

+            coverage = compute_coveragef(pMin, pMax, pMid, ix, iy);

+         }

+         

+#if defined(DO_ATTRIBS)

+         /* compute attributes at left-most fragment */

+         span.attrStart[FRAG_ATTRIB_WPOS][3] = solve_plane(ix + 1.5F, iy + 0.5F, wPlane);

+         ATTRIB_LOOP_BEGIN

+            GLuint c;

+            for (c = 0; c < 4; c++) {

+               span.attrStart[attr][c] = solve_plane(ix + 1.5F, iy + 0.5F, attrPlane[attr][c]);

+            }

+         ATTRIB_LOOP_END

+#endif

+

+         if (startX <= ix)

+            continue;

+

+         n = (GLuint) startX - (GLuint) ix;

+

+         left = ix + 1;

+

+         /* shift all values to the left */

+         /* XXX this is temporary */

+         {

+            SWspanarrays *array = span.array;

+            GLint j;

+            for (j = 0; j < (GLint) n; j++) {

+               array->coverage[j] = array->coverage[j + left];

+               COPY_CHAN4(array->rgba[j], array->rgba[j + left]);

+#ifdef DO_Z

+               array->z[j] = array->z[j + left];

+#endif

+            }

+         }

+

+         span.x = left;

+         span.y = iy;

+         span.end = n;

+         _swrast_write_rgba_span(ctx, &span);

+      }

+   }

+}

+

+

+#undef DO_Z

+#undef DO_ATTRIBS

+#undef DO_OCCLUSION_TEST