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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5
+ *
+ * Copyright (C) 1999-2005 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.
+ */
+
+/*
+ * Regarding GL_NV_point_sprite:
+ *
+ * Portions of this software may use or implement intellectual
+ * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims
+ * any and all warranties with respect to such intellectual property,
+ * including any use thereof or modifications thereto.
+ */
+
+
+/*
+ * Point rendering template code.
+ *
+ * Set FLAGS = bitwise-OR of the following tokens:
+ *
+ * RGBA = do rgba instead of color index
+ * SMOOTH = do antialiasing
+ * TEXTURE = do texture coords
+ * SPECULAR = do separate specular color
+ * LARGE = do points with diameter > 1 pixel
+ * ATTENUATE = compute point size attenuation
+ * SPRITE = GL_ARB_point_sprite / GL_NV_point_sprite
+ *
+ * Notes: LARGE and ATTENUATE are exclusive of each other.
+ * TEXTURE requires RGBA
+ */
+
+
+/*
+ * NOTES on antialiased point rasterization:
+ *
+ * Let d = distance of fragment center from vertex.
+ * if d < rmin2 then
+ * fragment has 100% coverage
+ * else if d > rmax2 then
+ * fragment has 0% coverage
+ * else
+ * fragment has % coverage = (d - rmin2) / (rmax2 - rmin2)
+ */
+
+
+
+static void
+NAME ( GLcontext *ctx, const SWvertex *vert )
+{
+#if FLAGS & (ATTENUATE | LARGE | SMOOTH | SPRITE)
+ GLfloat size;
+#endif
+#if FLAGS & RGBA
+#if (FLAGS & ATTENUATE) && (FLAGS & SMOOTH)
+ GLfloat alphaAtten;
+#endif
+ const GLchan red = vert->color[0];
+ const GLchan green = vert->color[1];
+ const GLchan blue = vert->color[2];
+ const GLchan alpha = vert->color[3];
+#endif
+#if FLAGS & SPECULAR
+ const GLchan specRed = vert->specular[0];
+ const GLchan specGreen = vert->specular[1];
+ const GLchan specBlue = vert->specular[2];
+#endif
+#if FLAGS & INDEX
+ const GLuint colorIndex = (GLuint) vert->index; /* XXX round? */
+#endif
+#if FLAGS & TEXTURE
+ GLfloat texcoord[MAX_TEXTURE_COORD_UNITS][4];
+ GLuint u;
+#endif
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ struct sw_span *span = &(swrast->PointSpan);
+
+ /* Cull primitives with malformed coordinates.
+ */
+ {
+ float tmp = vert->win[0] + vert->win[1];
+ if (IS_INF_OR_NAN(tmp))
+ return;
+ }
+
+ /*
+ * Span init
+ */
+ span->interpMask = SPAN_FOG;
+ span->arrayMask = SPAN_XY | SPAN_Z;
+ span->fog = vert->fog;
+ span->fogStep = 0.0;
+#if FLAGS & RGBA
+ span->arrayMask |= SPAN_RGBA;
+#endif
+#if FLAGS & SPECULAR
+ span->arrayMask |= SPAN_SPEC;
+#endif
+#if FLAGS & INDEX
+ span->arrayMask |= SPAN_INDEX;
+#endif
+#if FLAGS & TEXTURE
+ span->arrayMask |= SPAN_TEXTURE;
+ if (ctx->FragmentProgram._Active) {
+ /* Don't divide texture s,t,r by q (use TXP to do that) */
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture._EnabledCoordUnits & (1 << u)) {
+ COPY_4V(texcoord[u], vert->texcoord[u]);
+ }
+ }
+ }
+ else {
+ /* Divide texture s,t,r by q here */
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture._EnabledCoordUnits & (1 << u)) {
+ const GLfloat q = vert->texcoord[u][3];
+ const GLfloat invQ = (q == 0.0F || q == 1.0F) ? 1.0F : (1.0F / q);
+ texcoord[u][0] = vert->texcoord[u][0] * invQ;
+ texcoord[u][1] = vert->texcoord[u][1] * invQ;
+ texcoord[u][2] = vert->texcoord[u][2] * invQ;
+ texcoord[u][3] = q;
+ }
+ }
+ }
+ /* need these for fragment programs */
+ span->w = 1.0F;
+ span->dwdx = 0.0F;
+ span->dwdy = 0.0F;
+#endif
+#if FLAGS & SMOOTH
+ span->arrayMask |= SPAN_COVERAGE;
+#endif
+#if FLAGS & SPRITE
+ span->arrayMask |= SPAN_TEXTURE;
+#endif
+
+ /* Compute point size if not known to be one */
+#if FLAGS & ATTENUATE
+ /* first, clamp attenuated size to the user-specifed range */
+ size = CLAMP(vert->pointSize, ctx->Point.MinSize, ctx->Point.MaxSize);
+#if (FLAGS & RGBA) && (FLAGS & SMOOTH)
+ /* only if multisampling, compute the fade factor */
+ if (ctx->Multisample.Enabled) {
+ if (vert->pointSize >= ctx->Point.Threshold) {
+ alphaAtten = 1.0F;
+ }
+ else {
+ GLfloat dsize = vert->pointSize / ctx->Point.Threshold;
+ alphaAtten = dsize * dsize;
+ }
+ }
+ else {
+ alphaAtten = 1.0;
+ }
+#endif
+#elif FLAGS & (LARGE | SMOOTH | SPRITE)
+ /* constant, non-attenuated size */
+ size = ctx->Point._Size; /* this is already clamped */
+#endif
+
+
+#if FLAGS & (ATTENUATE | LARGE | SMOOTH | SPRITE)
+ /***
+ *** Multi-pixel points
+ ***/
+
+ /* do final clamping now */
+ if (ctx->Point.SmoothFlag) {
+ size = CLAMP(size, ctx->Const.MinPointSizeAA, ctx->Const.MaxPointSizeAA);
+ }
+ else {
+ size = CLAMP(size, ctx->Const.MinPointSize, ctx->Const.MaxPointSize);
+ }
+
+ {{
+ GLint x, y;
+ const GLfloat radius = 0.5F * size;
+ const GLint z = (GLint) (vert->win[2] + 0.5F);
+ GLuint count;
+#if FLAGS & SMOOTH
+ const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */
+ const GLfloat rmax = radius + 0.7071F;
+ const GLfloat rmin2 = MAX2(0.0F, rmin * rmin);
+ const GLfloat rmax2 = rmax * rmax;
+ const GLfloat cscale = 1.0F / (rmax2 - rmin2);
+ const GLint xmin = (GLint) (vert->win[0] - radius);
+ const GLint xmax = (GLint) (vert->win[0] + radius);
+ const GLint ymin = (GLint) (vert->win[1] - radius);
+ const GLint ymax = (GLint) (vert->win[1] + radius);
+#else
+ /* non-smooth */
+ GLint xmin, xmax, ymin, ymax;
+ GLint iSize = (GLint) (size + 0.5F);
+ GLint iRadius;
+ iSize = MAX2(1, iSize);
+ iRadius = iSize / 2;
+ if (iSize & 1) {
+ /* odd size */
+ xmin = (GLint) (vert->win[0] - iRadius);
+ xmax = (GLint) (vert->win[0] + iRadius);
+ ymin = (GLint) (vert->win[1] - iRadius);
+ ymax = (GLint) (vert->win[1] + iRadius);
+ }
+ else {
+ /* even size */
+ xmin = (GLint) vert->win[0] - iRadius + 1;
+ xmax = xmin + iSize - 1;
+ ymin = (GLint) vert->win[1] - iRadius + 1;
+ ymax = ymin + iSize - 1;
+ }
+#endif /*SMOOTH*/
+
+ /* check if we need to flush */
+ if (span->end + (xmax-xmin+1) * (ymax-ymin+1) >= MAX_WIDTH ||
+ (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT))) {
+#if FLAGS & RGBA
+ _swrast_write_rgba_span(ctx, span);
+#else
+ _swrast_write_index_span(ctx, span);
+#endif
+ span->end = 0;
+ }
+
+ /*
+ * OK, generate fragments
+ */
+ count = span->end;
+ (void) radius;
+ for (y = ymin; y <= ymax; y++) {
+ /* check if we need to flush */
+ if (count + (xmax-xmin+1) >= MAX_WIDTH) {
+ span->end = count;
+#if FLAGS & RGBA
+ _swrast_write_rgba_span(ctx, span);
+#else
+ _swrast_write_index_span(ctx, span);
+#endif
+ count = span->end = 0;
+ }
+ for (x = xmin; x <= xmax; x++) {
+#if FLAGS & (SPRITE | TEXTURE)
+ GLuint u;
+#endif
+
+#if FLAGS & RGBA
+ span->array->rgba[count][RCOMP] = red;
+ span->array->rgba[count][GCOMP] = green;
+ span->array->rgba[count][BCOMP] = blue;
+ span->array->rgba[count][ACOMP] = alpha;
+#endif
+#if FLAGS & SPECULAR
+ span->array->spec[count][RCOMP] = specRed;
+ span->array->spec[count][GCOMP] = specGreen;
+ span->array->spec[count][BCOMP] = specBlue;
+#endif
+#if FLAGS & INDEX
+ span->array->index[count] = colorIndex;
+#endif
+#if FLAGS & TEXTURE
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture._EnabledCoordUnits & (1 << u)) {
+ COPY_4V(span->array->texcoords[u][count], texcoord[u]);
+ }
+ }
+#endif
+
+#if FLAGS & SMOOTH
+ /* compute coverage */
+ {
+ const GLfloat dx = x - vert->win[0] + 0.5F;
+ const GLfloat dy = y - vert->win[1] + 0.5F;
+ const GLfloat dist2 = dx * dx + dy * dy;
+ if (dist2 < rmax2) {
+ if (dist2 >= rmin2) {
+ /* compute partial coverage */
+ span->array->coverage[count] = 1.0F - (dist2 - rmin2) * cscale;
+#if FLAGS & INDEX
+ /* coverage in [0,15] */
+ span->array->coverage[count] *= 15.0;
+#endif
+ }
+ else {
+ /* full coverage */
+ span->array->coverage[count] = 1.0F;
+ }
+
+ span->array->x[count] = x;
+ span->array->y[count] = y;
+ span->array->z[count] = z;
+
+#if (FLAGS & ATTENUATE) && (FLAGS & RGBA)
+ span->array->rgba[count][ACOMP] = (GLchan) (alpha * alphaAtten);
+#elif FLAGS & RGBA
+ span->array->rgba[count][ACOMP] = alpha;
+#endif /*ATTENUATE*/
+ count++;
+ } /*if*/
+ }
+
+#else /*SMOOTH*/
+
+ /* not smooth (square points) */
+ span->array->x[count] = x;
+ span->array->y[count] = y;
+ span->array->z[count] = z;
+
+#if FLAGS & SPRITE
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture.Unit[u]._ReallyEnabled) {
+ if (ctx->Point.CoordReplace[u]) {
+ GLfloat s = 0.5F + (x + 0.5F - vert->win[0]) / size;
+ GLfloat t, r;
+ if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
+ t = 0.5F + (y + 0.5F - vert->win[1]) / size;
+ else /* GL_UPPER_LEFT */
+ t = 0.5F - (y + 0.5F - vert->win[1]) / size;
+ if (ctx->Point.SpriteRMode == GL_ZERO)
+ r = 0.0F;
+ else if (ctx->Point.SpriteRMode == GL_S)
+ r = vert->texcoord[u][0];
+ else /* GL_R */
+ r = vert->texcoord[u][2];
+ span->array->texcoords[u][count][0] = s;
+ span->array->texcoords[u][count][1] = t;
+ span->array->texcoords[u][count][2] = r;
+ span->array->texcoords[u][count][3] = 1.0F;
+ }
+ else {
+ COPY_4V(span->array->texcoords[u][count], vert->texcoord[u]);
+ }
+ }
+ }
+#endif /*SPRITE*/
+
+ count++; /* square point */
+
+#endif /*SMOOTH*/
+
+ } /*for x*/
+ } /*for y*/
+ span->end = count;
+ }}
+
+#else /* LARGE | ATTENUATE | SMOOTH | SPRITE */
+
+ /***
+ *** Single-pixel points
+ ***/
+ {{
+ GLuint count;
+
+ /* check if we need to flush */
+ if (span->end >= MAX_WIDTH ||
+ (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT))) {
+#if FLAGS & RGBA
+ _swrast_write_rgba_span(ctx, span);
+#else
+ _swrast_write_index_span(ctx, span);
+#endif
+ span->end = 0;
+ }
+
+ count = span->end;
+
+#if FLAGS & RGBA
+ span->array->rgba[count][RCOMP] = red;
+ span->array->rgba[count][GCOMP] = green;
+ span->array->rgba[count][BCOMP] = blue;
+ span->array->rgba[count][ACOMP] = alpha;
+#endif
+#if FLAGS & SPECULAR
+ span->array->spec[count][RCOMP] = specRed;
+ span->array->spec[count][GCOMP] = specGreen;
+ span->array->spec[count][BCOMP] = specBlue;
+#endif
+#if FLAGS & INDEX
+ span->array->index[count] = colorIndex;
+#endif
+#if FLAGS & TEXTURE
+ for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
+ if (ctx->Texture.Unit[u]._ReallyEnabled) {
+ COPY_4V(span->array->texcoords[u][count], texcoord[u]);
+ }
+ }
+#endif
+
+ span->array->x[count] = (GLint) vert->win[0];
+ span->array->y[count] = (GLint) vert->win[1];
+ span->array->z[count] = (GLint) (vert->win[2] + 0.5F);
+ span->end = count + 1;
+ }}
+
+#endif /* LARGE || ATTENUATE || SMOOTH */
+
+ ASSERT(span->end <= MAX_WIDTH);
+}
+
+
+#undef FLAGS
+#undef NAME