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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.3
+ *
+ * Copyright (C) 1999-2004 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.
+ */
+
+
+/*
+ * Line Rasterizer Template
+ *
+ * This file is #include'd to generate custom line rasterizers.
+ *
+ * The following macros may be defined to indicate what auxillary information
+ * must be interplated along the line:
+ * INTERP_Z - if defined, interpolate Z values
+ * INTERP_FOG - if defined, interpolate FOG values
+ * INTERP_RGBA - if defined, interpolate RGBA values
+ * INTERP_SPEC - if defined, interpolate specular RGB values
+ * INTERP_INDEX - if defined, interpolate color index values
+ * INTERP_TEX - if defined, interpolate unit 0 texcoords
+ * INTERP_MULTITEX - if defined, interpolate multi-texcoords
+ *
+ * When one can directly address pixels in the color buffer the following
+ * macros can be defined and used to directly compute pixel addresses during
+ * rasterization (see pixelPtr):
+ * PIXEL_TYPE - the datatype of a pixel (GLubyte, GLushort, GLuint)
+ * BYTES_PER_ROW - number of bytes per row in the color buffer
+ * PIXEL_ADDRESS(X,Y) - returns the address of pixel at (X,Y) where
+ * Y==0 at bottom of screen and increases upward.
+ *
+ * Similarly, for direct depth buffer access, this type is used for depth
+ * buffer addressing:
+ * DEPTH_TYPE - either GLushort or GLuint
+ *
+ * Optionally, one may provide one-time setup code
+ * SETUP_CODE - code which is to be executed once per line
+ *
+ * To actually "plot" each pixel the PLOT macro must be defined...
+ * PLOT(X,Y) - code to plot a pixel. Example:
+ * if (Z < *zPtr) {
+ * *zPtr = Z;
+ * color = pack_rgb( FixedToInt(r0), FixedToInt(g0),
+ * FixedToInt(b0) );
+ * put_pixel( X, Y, color );
+ * }
+ *
+ * This code was designed for the origin to be in the lower-left corner.
+ *
+ */
+
+
+static void
+NAME( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 )
+{
+ struct sw_span span;
+ GLuint interpFlags = 0;
+ GLint x0 = (GLint) vert0->win[0];
+ GLint x1 = (GLint) vert1->win[0];
+ GLint y0 = (GLint) vert0->win[1];
+ GLint y1 = (GLint) vert1->win[1];
+ GLint dx, dy;
+ GLint numPixels;
+ GLint xstep, ystep;
+#if defined(DEPTH_TYPE)
+ const GLint depthBits = ctx->Visual.depthBits;
+ const GLint fixedToDepthShift = depthBits <= 16 ? FIXED_SHIFT : 0;
+ struct gl_renderbuffer *zrb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+#define FixedToDepth(F) ((F) >> fixedToDepthShift)
+ GLint zPtrXstep, zPtrYstep;
+ DEPTH_TYPE *zPtr;
+#elif defined(INTERP_Z)
+ const GLint depthBits = ctx->Visual.depthBits;
+#endif
+#ifdef PIXEL_ADDRESS
+ PIXEL_TYPE *pixelPtr;
+ GLint pixelXstep, pixelYstep;
+#endif
+
+#ifdef SETUP_CODE
+ SETUP_CODE
+#endif
+
+ /* Cull primitives with malformed coordinates.
+ */
+ {
+ GLfloat tmp = vert0->win[0] + vert0->win[1]
+ + vert1->win[0] + vert1->win[1];
+ if (IS_INF_OR_NAN(tmp))
+ return;
+ }
+
+ /*
+ printf("%s():\n", __FUNCTION__);
+ printf(" (%f, %f, %f) -> (%f, %f, %f)\n",
+ vert0->win[0], vert0->win[1], vert0->win[2],
+ vert1->win[0], vert1->win[1], vert1->win[2]);
+ printf(" (%d, %d, %d) -> (%d, %d, %d)\n",
+ vert0->color[0], vert0->color[1], vert0->color[2],
+ vert1->color[0], vert1->color[1], vert1->color[2]);
+ printf(" (%d, %d, %d) -> (%d, %d, %d)\n",
+ vert0->specular[0], vert0->specular[1], vert0->specular[2],
+ vert1->specular[0], vert1->specular[1], vert1->specular[2]);
+ */
+
+/*
+ * Despite being clipped to the view volume, the line's window coordinates
+ * may just lie outside the window bounds. That is, if the legal window
+ * coordinates are [0,W-1][0,H-1], it's possible for x==W and/or y==H.
+ * This quick and dirty code nudges the endpoints inside the window if
+ * necessary.
+ */
+#ifdef CLIP_HACK
+ {
+ GLint w = ctx->DrawBuffer->Width;
+ GLint h = ctx->DrawBuffer->Height;
+ if ((x0==w) | (x1==w)) {
+ if ((x0==w) & (x1==w))
+ return;
+ x0 -= x0==w;
+ x1 -= x1==w;
+ }
+ if ((y0==h) | (y1==h)) {
+ if ((y0==h) & (y1==h))
+ return;
+ y0 -= y0==h;
+ y1 -= y1==h;
+ }
+ }
+#endif
+
+ dx = x1 - x0;
+ dy = y1 - y0;
+ if (dx == 0 && dy == 0)
+ return;
+
+#ifdef DEPTH_TYPE
+ zPtr = (DEPTH_TYPE *) zrb->GetPointer(ctx, zrb, x0, y0);
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelPtr = (PIXEL_TYPE *) PIXEL_ADDRESS(x0,y0);
+#endif
+
+ if (dx<0) {
+ dx = -dx; /* make positive */
+ xstep = -1;
+#ifdef DEPTH_TYPE
+ zPtrXstep = -((GLint)sizeof(DEPTH_TYPE));
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelXstep = -((GLint)sizeof(PIXEL_TYPE));
+#endif
+ }
+ else {
+ xstep = 1;
+#ifdef DEPTH_TYPE
+ zPtrXstep = ((GLint)sizeof(DEPTH_TYPE));
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelXstep = ((GLint)sizeof(PIXEL_TYPE));
+#endif
+ }
+
+ if (dy<0) {
+ dy = -dy; /* make positive */
+ ystep = -1;
+#ifdef DEPTH_TYPE
+ zPtrYstep = -((GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE)));
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelYstep = BYTES_PER_ROW;
+#endif
+ }
+ else {
+ ystep = 1;
+#ifdef DEPTH_TYPE
+ zPtrYstep = (GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE));
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelYstep = -(BYTES_PER_ROW);
+#endif
+ }
+
+ ASSERT(dx >= 0);
+ ASSERT(dy >= 0);
+
+ numPixels = MAX2(dx, dy);
+
+ /*
+ * Span setup: compute start and step values for all interpolated values.
+ */
+#ifdef INTERP_RGBA
+ interpFlags |= SPAN_RGBA;
+ if (ctx->Light.ShadeModel == GL_SMOOTH) {
+ span.red = ChanToFixed(vert0->color[0]);
+ span.green = ChanToFixed(vert0->color[1]);
+ span.blue = ChanToFixed(vert0->color[2]);
+ span.alpha = ChanToFixed(vert0->color[3]);
+ span.redStep = (ChanToFixed(vert1->color[0]) - span.red ) / numPixels;
+ span.greenStep = (ChanToFixed(vert1->color[1]) - span.green) / numPixels;
+ span.blueStep = (ChanToFixed(vert1->color[2]) - span.blue ) / numPixels;
+ span.alphaStep = (ChanToFixed(vert1->color[3]) - span.alpha) / numPixels;
+ }
+ else {
+ span.red = ChanToFixed(vert1->color[0]);
+ span.green = ChanToFixed(vert1->color[1]);
+ span.blue = ChanToFixed(vert1->color[2]);
+ span.alpha = ChanToFixed(vert1->color[3]);
+ span.redStep = 0;
+ span.greenStep = 0;
+ span.blueStep = 0;
+ span.alphaStep = 0;
+ }
+#endif
+#ifdef INTERP_SPEC
+ interpFlags |= SPAN_SPEC;
+ if (ctx->Light.ShadeModel == GL_SMOOTH) {
+ span.specRed = ChanToFixed(vert0->specular[0]);
+ span.specGreen = ChanToFixed(vert0->specular[1]);
+ span.specBlue = ChanToFixed(vert0->specular[2]);
+ span.specRedStep = (ChanToFixed(vert1->specular[0]) - span.specRed) / numPixels;
+ span.specGreenStep = (ChanToFixed(vert1->specular[1]) - span.specBlue) / numPixels;
+ span.specBlueStep = (ChanToFixed(vert1->specular[2]) - span.specGreen) / numPixels;
+ }
+ else {
+ span.specRed = ChanToFixed(vert1->specular[0]);
+ span.specGreen = ChanToFixed(vert1->specular[1]);
+ span.specBlue = ChanToFixed(vert1->specular[2]);
+ span.specRedStep = 0;
+ span.specGreenStep = 0;
+ span.specBlueStep = 0;
+ }
+#endif
+#ifdef INTERP_INDEX
+ interpFlags |= SPAN_INDEX;
+ if (ctx->Light.ShadeModel == GL_SMOOTH) {
+ span.index = FloatToFixed(vert0->index);
+ span.indexStep = FloatToFixed(vert1->index - vert0->index) / numPixels;
+ }
+ else {
+ span.index = FloatToFixed(vert1->index);
+ span.indexStep = 0;
+ }
+#endif
+#if defined(INTERP_Z) || defined(DEPTH_TYPE)
+ interpFlags |= SPAN_Z;
+ {
+ if (depthBits <= 16) {
+ span.z = FloatToFixed(vert0->win[2]) + FIXED_HALF;
+ span.zStep = FloatToFixed(vert1->win[2] - vert0->win[2]) / numPixels;
+ }
+ else {
+ /* don't use fixed point */
+ span.z = (GLint) vert0->win[2];
+ span.zStep = (GLint) ((vert1->win[2] - vert0->win[2]) / numPixels);
+ }
+ }
+#endif
+#ifdef INTERP_FOG
+ interpFlags |= SPAN_FOG;
+ span.fog = vert0->fog;
+ span.fogStep = (vert1->fog - vert0->fog) / numPixels;
+#endif
+#ifdef INTERP_TEX
+ interpFlags |= SPAN_TEXTURE;
+ {
+ const GLfloat invw0 = vert0->win[3];
+ const GLfloat invw1 = vert1->win[3];
+ const GLfloat invLen = 1.0F / numPixels;
+ GLfloat ds, dt, dr, dq;
+ span.tex[0][0] = invw0 * vert0->texcoord[0][0];
+ span.tex[0][1] = invw0 * vert0->texcoord[0][1];
+ span.tex[0][2] = invw0 * vert0->texcoord[0][2];
+ span.tex[0][3] = invw0 * vert0->texcoord[0][3];
+ ds = (invw1 * vert1->texcoord[0][0]) - span.tex[0][0];
+ dt = (invw1 * vert1->texcoord[0][1]) - span.tex[0][1];
+ dr = (invw1 * vert1->texcoord[0][2]) - span.tex[0][2];
+ dq = (invw1 * vert1->texcoord[0][3]) - span.tex[0][3];
+ span.texStepX[0][0] = ds * invLen;
+ span.texStepX[0][1] = dt * invLen;
+ span.texStepX[0][2] = dr * invLen;
+ span.texStepX[0][3] = dq * invLen;
+ span.texStepY[0][0] = 0.0F;
+ span.texStepY[0][1] = 0.0F;
+ span.texStepY[0][2] = 0.0F;
+ span.texStepY[0][3] = 0.0F;
+ }
+#endif
+#ifdef INTERP_MULTITEX
+ interpFlags |= SPAN_TEXTURE;
+ {
+ const GLfloat invLen = 1.0F / numPixels;
+ GLuint u;
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture.Unit[u]._ReallyEnabled) {
+ const GLfloat invw0 = vert0->win[3];
+ const GLfloat invw1 = vert1->win[3];
+ GLfloat ds, dt, dr, dq;
+ span.tex[u][0] = invw0 * vert0->texcoord[u][0];
+ span.tex[u][1] = invw0 * vert0->texcoord[u][1];
+ span.tex[u][2] = invw0 * vert0->texcoord[u][2];
+ span.tex[u][3] = invw0 * vert0->texcoord[u][3];
+ ds = (invw1 * vert1->texcoord[u][0]) - span.tex[u][0];
+ dt = (invw1 * vert1->texcoord[u][1]) - span.tex[u][1];
+ dr = (invw1 * vert1->texcoord[u][2]) - span.tex[u][2];
+ dq = (invw1 * vert1->texcoord[u][3]) - span.tex[u][3];
+ span.texStepX[u][0] = ds * invLen;
+ span.texStepX[u][1] = dt * invLen;
+ span.texStepX[u][2] = dr * invLen;
+ span.texStepX[u][3] = dq * invLen;
+ span.texStepY[u][0] = 0.0F;
+ span.texStepY[u][1] = 0.0F;
+ span.texStepY[u][2] = 0.0F;
+ span.texStepY[u][3] = 0.0F;
+ }
+ }
+ }
+#endif
+
+ INIT_SPAN(span, GL_LINE, numPixels, interpFlags, SPAN_XY);
+
+ /* Need these for fragment prog texcoord interpolation */
+ span.w = 1.0F;
+ span.dwdx = 0.0F;
+ span.dwdy = 0.0F;
+
+ /*
+ * Draw
+ */
+
+ if (dx > dy) {
+ /*** X-major line ***/
+ GLint i;
+ GLint errorInc = dy+dy;
+ GLint error = errorInc-dx;
+ GLint errorDec = error-dx;
+
+ for (i = 0; i < dx; i++) {
+#ifdef DEPTH_TYPE
+ GLdepth Z = FixedToDepth(span.z);
+#endif
+#ifdef PLOT
+ PLOT( x0, y0 );
+#else
+ span.array->x[i] = x0;
+ span.array->y[i] = y0;
+#endif
+ x0 += xstep;
+#ifdef DEPTH_TYPE
+ zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep);
+ span.z += span.zStep;
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep);
+#endif
+ if (error<0) {
+ error += errorInc;
+ }
+ else {
+ error += errorDec;
+ y0 += ystep;
+#ifdef DEPTH_TYPE
+ zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep);
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep);
+#endif
+ }
+ }
+ }
+ else {
+ /*** Y-major line ***/
+ GLint i;
+ GLint errorInc = dx+dx;
+ GLint error = errorInc-dy;
+ GLint errorDec = error-dy;
+
+ for (i=0;i<dy;i++) {
+#ifdef DEPTH_TYPE
+ GLdepth Z = FixedToDepth(span.z);
+#endif
+#ifdef PLOT
+ PLOT( x0, y0 );
+#else
+ span.array->x[i] = x0;
+ span.array->y[i] = y0;
+#endif
+ y0 += ystep;
+#ifdef DEPTH_TYPE
+ zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep);
+ span.z += span.zStep;
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep);
+#endif
+ if (error<0) {
+ error += errorInc;
+ }
+ else {
+ error += errorDec;
+ x0 += xstep;
+#ifdef DEPTH_TYPE
+ zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep);
+#endif
+#ifdef PIXEL_ADDRESS
+ pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep);
+#endif
+ }
+ }
+ }
+
+#ifdef RENDER_SPAN
+ RENDER_SPAN( span );
+#endif
+
+ (void)span;
+
+}
+
+
+#undef NAME
+#undef INTERP_Z
+#undef INTERP_FOG
+#undef INTERP_RGBA
+#undef INTERP_SPEC
+#undef INTERP_TEX
+#undef INTERP_MULTITEX
+#undef INTERP_INDEX
+#undef PIXEL_ADDRESS
+#undef PIXEL_TYPE
+#undef DEPTH_TYPE
+#undef BYTES_PER_ROW
+#undef SETUP_CODE
+#undef PLOT
+#undef CLIP_HACK
+#undef FixedToDepth
+#undef RENDER_SPAN
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