diff options
Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_span.c')
| -rw-r--r-- | nx-X11/extras/Mesa/src/mesa/swrast/s_span.c | 1511 |
1 files changed, 0 insertions, 1511 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_span.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_span.c deleted file mode 100644 index 47fa02bf1..000000000 --- a/nx-X11/extras/Mesa/src/mesa/swrast/s_span.c +++ /dev/null @@ -1,1511 +0,0 @@ -/* - * Mesa 3-D graphics library - * Version: 6.3 - * - * 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. - */ - - -/** - * \file swrast/s_span.c - * \brief Span processing functions used by all rasterization functions. - * This is where all the per-fragment tests are performed - * \author Brian Paul - */ - -#include "glheader.h" -#include "colormac.h" -#include "context.h" -#include "macros.h" -#include "imports.h" - -#include "s_atifragshader.h" -#include "s_alpha.h" -#include "s_blend.h" -#include "s_context.h" -#include "s_depth.h" -#include "s_fog.h" -#include "s_logic.h" -#include "s_masking.h" -#include "s_nvfragprog.h" -#include "s_span.h" -#include "s_stencil.h" -#include "s_texture.h" - - -/** - * Init span's Z interpolation values to the RasterPos Z. - * Used during setup for glDraw/CopyPixels. - */ -void -_swrast_span_default_z( GLcontext *ctx, struct sw_span *span ) -{ - const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF; - if (ctx->Visual.depthBits <= 16) - span->z = FloatToFixed(ctx->Current.RasterPos[2] * depthMax + 0.5F); - else - span->z = (GLint) (ctx->Current.RasterPos[2] * depthMax + 0.5F); - span->zStep = 0; - span->interpMask |= SPAN_Z; -} - - -/** - * Init span's fog interpolation values to the RasterPos fog. - * Used during setup for glDraw/CopyPixels. - */ -void -_swrast_span_default_fog( GLcontext *ctx, struct sw_span *span ) -{ - span->fog = _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance); - span->fogStep = span->dfogdx = span->dfogdy = 0.0F; - span->interpMask |= SPAN_FOG; -} - - -/** - * Init span's rgba or index interpolation values to the RasterPos color. - * Used during setup for glDraw/CopyPixels. - */ -void -_swrast_span_default_color( GLcontext *ctx, struct sw_span *span ) -{ - if (ctx->Visual.rgbMode) { - GLchan r, g, b, a; - UNCLAMPED_FLOAT_TO_CHAN(r, ctx->Current.RasterColor[0]); - UNCLAMPED_FLOAT_TO_CHAN(g, ctx->Current.RasterColor[1]); - UNCLAMPED_FLOAT_TO_CHAN(b, ctx->Current.RasterColor[2]); - UNCLAMPED_FLOAT_TO_CHAN(a, ctx->Current.RasterColor[3]); -#if CHAN_TYPE == GL_FLOAT - span->red = r; - span->green = g; - span->blue = b; - span->alpha = a; -#else - span->red = IntToFixed(r); - span->green = IntToFixed(g); - span->blue = IntToFixed(b); - span->alpha = IntToFixed(a); -#endif - span->redStep = 0; - span->greenStep = 0; - span->blueStep = 0; - span->alphaStep = 0; - span->interpMask |= SPAN_RGBA; - } - else { - span->index = FloatToFixed(ctx->Current.RasterIndex); - span->indexStep = 0; - span->interpMask |= SPAN_INDEX; - } -} - - -/** - * Init span's texcoord interpolation values to the RasterPos texcoords. - * Used during setup for glDraw/CopyPixels. - */ -void -_swrast_span_default_texcoords( GLcontext *ctx, struct sw_span *span ) -{ - GLuint i; - for (i = 0; i < ctx->Const.MaxTextureUnits; i++) { - const GLfloat *tc = ctx->Current.RasterTexCoords[i]; - if (ctx->FragmentProgram._Active || ctx->ATIFragmentShader._Enabled) { - COPY_4V(span->tex[i], tc); - } - else if (tc[3] > 0.0F) { - /* use (s/q, t/q, r/q, 1) */ - span->tex[i][0] = tc[0] / tc[3]; - span->tex[i][1] = tc[1] / tc[3]; - span->tex[i][2] = tc[2] / tc[3]; - span->tex[i][3] = 1.0; - } - else { - ASSIGN_4V(span->tex[i], 0.0F, 0.0F, 0.0F, 1.0F); - } - ASSIGN_4V(span->texStepX[i], 0.0F, 0.0F, 0.0F, 0.0F); - ASSIGN_4V(span->texStepY[i], 0.0F, 0.0F, 0.0F, 0.0F); - } - span->interpMask |= SPAN_TEXTURE; -} - - -/* Fill in the span.color.rgba array from the interpolation values */ -static void -interpolate_colors(GLcontext *ctx, struct sw_span *span) -{ - const GLuint n = span->end; - GLchan (*rgba)[4] = span->array->rgba; - GLuint i; - (void) ctx; - - ASSERT((span->interpMask & SPAN_RGBA) && - !(span->arrayMask & SPAN_RGBA)); - - if (span->interpMask & SPAN_FLAT) { - /* constant color */ - GLchan color[4]; - color[RCOMP] = FixedToChan(span->red); - color[GCOMP] = FixedToChan(span->green); - color[BCOMP] = FixedToChan(span->blue); - color[ACOMP] = FixedToChan(span->alpha); - for (i = 0; i < n; i++) { - COPY_CHAN4(span->array->rgba[i], color); - } - } - else { - /* interpolate */ -#if CHAN_TYPE == GL_FLOAT - GLfloat r = span->red; - GLfloat g = span->green; - GLfloat b = span->blue; - GLfloat a = span->alpha; - const GLfloat dr = span->redStep; - const GLfloat dg = span->greenStep; - const GLfloat db = span->blueStep; - const GLfloat da = span->alphaStep; -#else - GLfixed r = span->red; - GLfixed g = span->green; - GLfixed b = span->blue; - GLfixed a = span->alpha; - const GLint dr = span->redStep; - const GLint dg = span->greenStep; - const GLint db = span->blueStep; - const GLint da = span->alphaStep; -#endif - for (i = 0; i < n; i++) { - rgba[i][RCOMP] = FixedToChan(r); - rgba[i][GCOMP] = FixedToChan(g); - rgba[i][BCOMP] = FixedToChan(b); - rgba[i][ACOMP] = FixedToChan(a); - r += dr; - g += dg; - b += db; - a += da; - } - } - span->arrayMask |= SPAN_RGBA; -} - - -/* Fill in the span.color.index array from the interpolation values */ -static void -interpolate_indexes(GLcontext *ctx, struct sw_span *span) -{ - GLfixed index = span->index; - const GLint indexStep = span->indexStep; - const GLuint n = span->end; - GLuint *indexes = span->array->index; - GLuint i; - (void) ctx; - ASSERT((span->interpMask & SPAN_INDEX) && - !(span->arrayMask & SPAN_INDEX)); - - if ((span->interpMask & SPAN_FLAT) || (indexStep == 0)) { - /* constant color */ - index = FixedToInt(index); - for (i = 0; i < n; i++) { - indexes[i] = index; - } - } - else { - /* interpolate */ - for (i = 0; i < n; i++) { - indexes[i] = FixedToInt(index); - index += indexStep; - } - } - span->arrayMask |= SPAN_INDEX; - span->interpMask &= ~SPAN_INDEX; -} - - -/* Fill in the span.->array->spec array from the interpolation values */ -static void -interpolate_specular(GLcontext *ctx, struct sw_span *span) -{ - (void) ctx; - if (span->interpMask & SPAN_FLAT) { - /* constant color */ - const GLchan r = FixedToChan(span->specRed); - const GLchan g = FixedToChan(span->specGreen); - const GLchan b = FixedToChan(span->specBlue); - GLuint i; - for (i = 0; i < span->end; i++) { - span->array->spec[i][RCOMP] = r; - span->array->spec[i][GCOMP] = g; - span->array->spec[i][BCOMP] = b; - } - } - else { - /* interpolate */ -#if CHAN_TYPE == GL_FLOAT - GLfloat r = span->specRed; - GLfloat g = span->specGreen; - GLfloat b = span->specBlue; -#else - GLfixed r = span->specRed; - GLfixed g = span->specGreen; - GLfixed b = span->specBlue; -#endif - GLuint i; - for (i = 0; i < span->end; i++) { - span->array->spec[i][RCOMP] = FixedToChan(r); - span->array->spec[i][GCOMP] = FixedToChan(g); - span->array->spec[i][BCOMP] = FixedToChan(b); - r += span->specRedStep; - g += span->specGreenStep; - b += span->specBlueStep; - } - } - span->arrayMask |= SPAN_SPEC; -} - - -/* Fill in the span.array.fog values from the interpolation values */ -static void -interpolate_fog(const GLcontext *ctx, struct sw_span *span) -{ - GLfloat *fog = span->array->fog; - const GLfloat fogStep = span->fogStep; - GLfloat fogCoord = span->fog; - const GLuint haveW = (span->interpMask & SPAN_W); - const GLfloat wStep = haveW ? span->dwdx : 0.0F; - GLfloat w = haveW ? span->w : 1.0F; - GLuint i; - for (i = 0; i < span->end; i++) { - fog[i] = fogCoord / w; - fogCoord += fogStep; - w += wStep; - } - span->arrayMask |= SPAN_FOG; -} - - -/* Fill in the span.zArray array from the interpolation values */ -void -_swrast_span_interpolate_z( const GLcontext *ctx, struct sw_span *span ) -{ - const GLuint n = span->end; - GLuint i; - - ASSERT((span->interpMask & SPAN_Z) && - !(span->arrayMask & SPAN_Z)); - - if (ctx->Visual.depthBits <= 16) { - GLfixed zval = span->z; - GLdepth *z = span->array->z; - for (i = 0; i < n; i++) { - z[i] = FixedToInt(zval); - zval += span->zStep; - } - } - else { - /* Deep Z buffer, no fixed->int shift */ - GLfixed zval = span->z; - GLdepth *z = span->array->z; - for (i = 0; i < n; i++) { - z[i] = zval; - zval += span->zStep; - } - } - span->interpMask &= ~SPAN_Z; - span->arrayMask |= SPAN_Z; -} - - -/* - * This the ideal solution, as given in the OpenGL spec. - */ -#if 0 -static GLfloat -compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, - GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, - GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) -{ - GLfloat dudx = texW * ((s + dsdx) / (q + dqdx) - s * invQ); - GLfloat dvdx = texH * ((t + dtdx) / (q + dqdx) - t * invQ); - GLfloat dudy = texW * ((s + dsdy) / (q + dqdy) - s * invQ); - GLfloat dvdy = texH * ((t + dtdy) / (q + dqdy) - t * invQ); - GLfloat x = SQRTF(dudx * dudx + dvdx * dvdx); - GLfloat y = SQRTF(dudy * dudy + dvdy * dvdy); - GLfloat rho = MAX2(x, y); - GLfloat lambda = LOG2(rho); - return lambda; -} -#endif - - -/* - * This is a faster approximation - */ -GLfloat -_swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, - GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, - GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) -{ - GLfloat dsdx2 = (s + dsdx) / (q + dqdx) - s * invQ; - GLfloat dtdx2 = (t + dtdx) / (q + dqdx) - t * invQ; - GLfloat dsdy2 = (s + dsdy) / (q + dqdy) - s * invQ; - GLfloat dtdy2 = (t + dtdy) / (q + dqdy) - t * invQ; - GLfloat maxU, maxV, rho, lambda; - dsdx2 = FABSF(dsdx2); - dsdy2 = FABSF(dsdy2); - dtdx2 = FABSF(dtdx2); - dtdy2 = FABSF(dtdy2); - maxU = MAX2(dsdx2, dsdy2) * texW; - maxV = MAX2(dtdx2, dtdy2) * texH; - rho = MAX2(maxU, maxV); - lambda = LOG2(rho); - return lambda; -} - - -/** - * Fill in the span.texcoords array from the interpolation values. - * Note: in the places where we divide by Q (or mult by invQ) we're - * really doing two things: perspective correction and texcoord - * projection. Remember, for texcoord (s,t,r,q) we need to index - * texels with (s/q, t/q, r/q). - * If we're using a fragment program, we never do the division - * for texcoord projection. That's done by the TXP instruction - * or user-written code. - */ -static void -interpolate_texcoords(GLcontext *ctx, struct sw_span *span) -{ - ASSERT(span->interpMask & SPAN_TEXTURE); - ASSERT(!(span->arrayMask & SPAN_TEXTURE)); - - if (ctx->Texture._EnabledCoordUnits > 1) { - /* multitexture */ - GLuint u; - span->arrayMask |= SPAN_TEXTURE; - for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { - if (ctx->Texture._EnabledCoordUnits & (1 << u)) { - const struct gl_texture_object *obj =ctx->Texture.Unit[u]._Current; - GLfloat texW, texH; - GLboolean needLambda; - if (obj) { - const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel]; - needLambda = (obj->MinFilter != obj->MagFilter) - || ctx->FragmentProgram._Active; - texW = img->WidthScale; - texH = img->HeightScale; - } - else { - /* using a fragment program */ - texW = 1.0; - texH = 1.0; - needLambda = GL_FALSE; - } - if (needLambda) { - GLfloat (*texcoord)[4] = span->array->texcoords[u]; - GLfloat *lambda = span->array->lambda[u]; - const GLfloat dsdx = span->texStepX[u][0]; - const GLfloat dsdy = span->texStepY[u][0]; - const GLfloat dtdx = span->texStepX[u][1]; - const GLfloat dtdy = span->texStepY[u][1]; - const GLfloat drdx = span->texStepX[u][2]; - const GLfloat dqdx = span->texStepX[u][3]; - const GLfloat dqdy = span->texStepY[u][3]; - GLfloat s = span->tex[u][0]; - GLfloat t = span->tex[u][1]; - GLfloat r = span->tex[u][2]; - GLfloat q = span->tex[u][3]; - GLuint i; - if (ctx->FragmentProgram._Active) { - /* do perspective correction but don't divide s, t, r by q */ - const GLfloat dwdx = span->dwdx; - GLfloat w = span->w; - for (i = 0; i < span->end; i++) { - const GLfloat invW = 1.0F / w; - texcoord[i][0] = s * invW; - texcoord[i][1] = t * invW; - texcoord[i][2] = r * invW; - texcoord[i][3] = q * invW; - lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, - dqdx, dqdy, texW, texH, - s, t, q, invW); - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - w += dwdx; - } - - } - else { - for (i = 0; i < span->end; i++) { - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, - dqdx, dqdy, texW, texH, - s, t, q, invQ); - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - } - } - span->arrayMask |= SPAN_LAMBDA; - } - else { - GLfloat (*texcoord)[4] = span->array->texcoords[u]; - GLfloat *lambda = span->array->lambda[u]; - const GLfloat dsdx = span->texStepX[u][0]; - const GLfloat dtdx = span->texStepX[u][1]; - const GLfloat drdx = span->texStepX[u][2]; - const GLfloat dqdx = span->texStepX[u][3]; - GLfloat s = span->tex[u][0]; - GLfloat t = span->tex[u][1]; - GLfloat r = span->tex[u][2]; - GLfloat q = span->tex[u][3]; - GLuint i; - if (ctx->FragmentProgram._Active) { - /* do perspective correction but don't divide s, t, r by q */ - const GLfloat dwdx = span->dwdx; - GLfloat w = span->w; - for (i = 0; i < span->end; i++) { - const GLfloat invW = 1.0F / w; - texcoord[i][0] = s * invW; - texcoord[i][1] = t * invW; - texcoord[i][2] = r * invW; - texcoord[i][3] = q * invW; - lambda[i] = 0.0; - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - w += dwdx; - } - } - else if (dqdx == 0.0F) { - /* Ortho projection or polygon's parallel to window X axis */ - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - for (i = 0; i < span->end; i++) { - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - lambda[i] = 0.0; - s += dsdx; - t += dtdx; - r += drdx; - } - } - else { - for (i = 0; i < span->end; i++) { - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - lambda[i] = 0.0; - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - } - } - } /* lambda */ - } /* if */ - } /* for */ - } - else { - /* single texture */ - const struct gl_texture_object *obj = ctx->Texture.Unit[0]._Current; - GLfloat texW, texH; - GLboolean needLambda; - if (obj) { - const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel]; - needLambda = (obj->MinFilter != obj->MagFilter) - || ctx->FragmentProgram._Active; - texW = (GLfloat) img->WidthScale; - texH = (GLfloat) img->HeightScale; - } - else { - needLambda = GL_FALSE; - texW = texH = 1.0; - } - span->arrayMask |= SPAN_TEXTURE; - if (needLambda) { - /* just texture unit 0, with lambda */ - GLfloat (*texcoord)[4] = span->array->texcoords[0]; - GLfloat *lambda = span->array->lambda[0]; - const GLfloat dsdx = span->texStepX[0][0]; - const GLfloat dsdy = span->texStepY[0][0]; - const GLfloat dtdx = span->texStepX[0][1]; - const GLfloat dtdy = span->texStepY[0][1]; - const GLfloat drdx = span->texStepX[0][2]; - const GLfloat dqdx = span->texStepX[0][3]; - const GLfloat dqdy = span->texStepY[0][3]; - GLfloat s = span->tex[0][0]; - GLfloat t = span->tex[0][1]; - GLfloat r = span->tex[0][2]; - GLfloat q = span->tex[0][3]; - GLuint i; - if (ctx->FragmentProgram._Active) { - /* do perspective correction but don't divide s, t, r by q */ - const GLfloat dwdx = span->dwdx; - GLfloat w = span->w; - for (i = 0; i < span->end; i++) { - const GLfloat invW = 1.0F / w; - texcoord[i][0] = s * invW; - texcoord[i][1] = t * invW; - texcoord[i][2] = r * invW; - texcoord[i][3] = q * invW; - lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, - dqdx, dqdy, texW, texH, - s, t, q, invW); - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - w += dwdx; - } - } - else { - /* tex.c */ - for (i = 0; i < span->end; i++) { - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, - dqdx, dqdy, texW, texH, - s, t, q, invQ); - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - } - } - span->arrayMask |= SPAN_LAMBDA; - } - else { - /* just texture 0, without lambda */ - GLfloat (*texcoord)[4] = span->array->texcoords[0]; - const GLfloat dsdx = span->texStepX[0][0]; - const GLfloat dtdx = span->texStepX[0][1]; - const GLfloat drdx = span->texStepX[0][2]; - const GLfloat dqdx = span->texStepX[0][3]; - GLfloat s = span->tex[0][0]; - GLfloat t = span->tex[0][1]; - GLfloat r = span->tex[0][2]; - GLfloat q = span->tex[0][3]; - GLuint i; - if (ctx->FragmentProgram._Active) { - /* do perspective correction but don't divide s, t, r by q */ - const GLfloat dwdx = span->dwdx; - GLfloat w = span->w; - for (i = 0; i < span->end; i++) { - const GLfloat invW = 1.0F / w; - texcoord[i][0] = s * invW; - texcoord[i][1] = t * invW; - texcoord[i][2] = r * invW; - texcoord[i][3] = q * invW; - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - w += dwdx; - } - } - else if (dqdx == 0.0F) { - /* Ortho projection or polygon's parallel to window X axis */ - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - for (i = 0; i < span->end; i++) { - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - s += dsdx; - t += dtdx; - r += drdx; - } - } - else { - for (i = 0; i < span->end; i++) { - const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); - texcoord[i][0] = s * invQ; - texcoord[i][1] = t * invQ; - texcoord[i][2] = r * invQ; - texcoord[i][3] = q; - s += dsdx; - t += dtdx; - r += drdx; - q += dqdx; - } - } - } - } -} - - -/** - * Apply the current polygon stipple pattern to a span of pixels. - */ -static void -stipple_polygon_span( GLcontext *ctx, struct sw_span *span ) -{ - const GLuint highbit = 0x80000000; - const GLuint stipple = ctx->PolygonStipple[span->y % 32]; - GLubyte *mask = span->array->mask; - GLuint i, m; - - ASSERT(ctx->Polygon.StippleFlag); - ASSERT((span->arrayMask & SPAN_XY) == 0); - - m = highbit >> (GLuint) (span->x % 32); - - for (i = 0; i < span->end; i++) { - if ((m & stipple) == 0) { - mask[i] = 0; - } - m = m >> 1; - if (m == 0) { - m = highbit; - } - } - span->writeAll = GL_FALSE; -} - - -/** - * Clip a pixel span to the current buffer/window boundaries: - * DrawBuffer->_Xmin, _Xmax, _Ymin, _Ymax. This will accomplish - * window clipping and scissoring. - * Return: GL_TRUE some pixels still visible - * GL_FALSE nothing visible - */ -static GLuint -clip_span( GLcontext *ctx, struct sw_span *span ) -{ - const GLint xmin = ctx->DrawBuffer->_Xmin; - const GLint xmax = ctx->DrawBuffer->_Xmax; - const GLint ymin = ctx->DrawBuffer->_Ymin; - const GLint ymax = ctx->DrawBuffer->_Ymax; - - if (span->arrayMask & SPAN_XY) { - /* arrays of x/y pixel coords */ - const GLint *x = span->array->x; - const GLint *y = span->array->y; - const GLint n = span->end; - GLubyte *mask = span->array->mask; - GLint i; - if (span->arrayMask & SPAN_MASK) { - /* note: using & intead of && to reduce branches */ - for (i = 0; i < n; i++) { - mask[i] &= (x[i] >= xmin) & (x[i] < xmax) - & (y[i] >= ymin) & (y[i] < ymax); - } - } - else { - /* note: using & intead of && to reduce branches */ - for (i = 0; i < n; i++) { - mask[i] = (x[i] >= xmin) & (x[i] < xmax) - & (y[i] >= ymin) & (y[i] < ymax); - } - } - return GL_TRUE; /* some pixels visible */ - } - else { - /* horizontal span of pixels */ - const GLint x = span->x; - const GLint y = span->y; - const GLint n = span->end; - - /* Trivial rejection tests */ - if (y < ymin || y >= ymax || x + n <= xmin || x >= xmax) { - span->end = 0; - return GL_FALSE; /* all pixels clipped */ - } - - /* Clip to the left */ - if (x < xmin) { - ASSERT(x + n > xmin); - span->writeAll = GL_FALSE; - _mesa_bzero(span->array->mask, (xmin - x) * sizeof(GLubyte)); - } - - /* Clip to right */ - if (x + n > xmax) { - ASSERT(x < xmax); - span->end = xmax - x; - } - - return GL_TRUE; /* some pixels visible */ - } -} - - -/** - * Apply all the per-fragment opertions to a span of color index fragments - * and write them to the enabled color drawbuffers. - * The 'span' parameter can be considered to be const. Note that - * span->interpMask and span->arrayMask may be changed but will be restored - * to their original values before returning. - */ -void -_swrast_write_index_span( GLcontext *ctx, struct sw_span *span) -{ - const SWcontext *swrast = SWRAST_CONTEXT(ctx); - const struct gl_framebuffer *fb = ctx->DrawBuffer; - const GLuint output = 0; - const GLuint origInterpMask = span->interpMask; - const GLuint origArrayMask = span->arrayMask; - GLuint buf; - - ASSERT(span->end <= MAX_WIDTH); - ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE || - span->primitive == GL_POLYGON || span->primitive == GL_BITMAP); - ASSERT((span->interpMask | span->arrayMask) & SPAN_INDEX); - ASSERT((span->interpMask & span->arrayMask) == 0); - - if (span->arrayMask & SPAN_MASK) { - /* mask was initialized by caller, probably glBitmap */ - span->writeAll = GL_FALSE; - } - else { - _mesa_memset(span->array->mask, 1, span->end); - span->writeAll = GL_TRUE; - } - - /* Clipping */ - if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) { - if (!clip_span(ctx, span)) { - return; - } - } - - /* Depth bounds test */ - if (ctx->Depth.BoundsTest && ctx->Visual.depthBits > 0) { - if (!_swrast_depth_bounds_test(ctx, span)) { - return; - } - } - -#ifdef DEBUG - /* Make sure all fragments are within window bounds */ - if (span->arrayMask & SPAN_XY) { - GLuint i; - for (i = 0; i < span->end; i++) { - if (span->array->mask[i]) { - assert(span->array->x[i] >= ctx->DrawBuffer->_Xmin); - assert(span->array->x[i] < ctx->DrawBuffer->_Xmax); - assert(span->array->y[i] >= ctx->DrawBuffer->_Ymin); - assert(span->array->y[i] < ctx->DrawBuffer->_Ymax); - } - } - } -#endif - - /* Polygon Stippling */ - if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) { - stipple_polygon_span(ctx, span); - } - - /* Stencil and Z testing */ - if (ctx->Depth.Test || ctx->Stencil.Enabled) { - if (span->interpMask & SPAN_Z) - _swrast_span_interpolate_z(ctx, span); - - if (ctx->Stencil.Enabled) { - if (!_swrast_stencil_and_ztest_span(ctx, span)) { - span->arrayMask = origArrayMask; - return; - } - } - else { - ASSERT(ctx->Depth.Test); - if (!_swrast_depth_test_span(ctx, span)) { - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; - return; - } - } - } - - /* if we get here, something passed the depth test */ - if (ctx->Depth.OcclusionTest) { - ctx->OcclusionResult = GL_TRUE; - } - -#if FEATURE_ARB_occlusion_query - if (ctx->Occlusion.Active) { - /* update count of 'passed' fragments */ - GLuint i; - for (i = 0; i < span->end; i++) - ctx->Occlusion.PassedCounter += span->array->mask[i]; - } -#endif - - /* we have to wait until after occlusion to do this test */ - if (ctx->Color.DrawBuffer == GL_NONE || ctx->Color.IndexMask == 0) { - /* write no pixels */ - span->arrayMask = origArrayMask; - return; - } - - /* Interpolate the color indexes if needed */ - if (swrast->_FogEnabled || - ctx->Color.IndexLogicOpEnabled || - ctx->Color.IndexMask != 0xffffffff || - (span->arrayMask & SPAN_COVERAGE)) { - if (span->interpMask & SPAN_INDEX) { - interpolate_indexes(ctx, span); - } - } - - /* Fog */ - if (swrast->_FogEnabled) { - _swrast_fog_ci_span(ctx, span); - } - - /* Antialias coverage application */ - if (span->arrayMask & SPAN_COVERAGE) { - const GLfloat *coverage = span->array->coverage; - GLuint *index = span->array->index; - GLuint i; - for (i = 0; i < span->end; i++) { - ASSERT(coverage[i] < 16); - index[i] = (index[i] & ~0xf) | ((GLuint) coverage[i]); - } - } - - /* Loop over drawing buffers */ - for (buf = 0; buf < fb->_NumColorDrawBuffers[output]; buf++) { - struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[output][buf]; - GLuint indexTemp[MAX_WIDTH], *index32; - - ASSERT(rb->_BaseFormat == GL_COLOR_INDEX); - - if (ctx->Color.IndexLogicOpEnabled || - ctx->Color.IndexMask != 0xffffffff) { - /* make copy of incoming indexes */ - MEMCPY(indexTemp, span->array->index, span->end * sizeof(GLuint)); - - if (ctx->Color.IndexLogicOpEnabled) { - _swrast_logicop_ci_span(ctx, rb, span, indexTemp); - } - - if (ctx->Color.IndexMask != 0xffffffff) { - _swrast_mask_ci_span(ctx, rb, span, indexTemp); - } - index32 = indexTemp; - } - else { - index32 = span->array->index; - } - - if ((span->interpMask & SPAN_INDEX) && span->indexStep == 0) { - /* all fragments have same color index */ - GLubyte index8; - GLushort index16; - GLuint index32; - void *value; - - if (rb->DataType == GL_UNSIGNED_BYTE) { - index8 = FixedToInt(span->index); - value = &index8; - } - else if (rb->DataType == GL_UNSIGNED_SHORT) { - index16 = FixedToInt(span->index); - value = &index16; - } - else { - ASSERT(rb->DataType == GL_UNSIGNED_INT); - index32 = FixedToInt(span->index); - value = &index32; - } - - if (span->arrayMask & SPAN_XY) { - rb->PutMonoValues(ctx, rb, span->end, span->array->x, - span->array->y, value, span->array->mask); - } - else { - rb->PutMonoRow(ctx, rb, span->end, span->x, span->y, - value, span->array->mask); - } - } - else { - /* each fragment is a different color */ - GLubyte index8[MAX_WIDTH]; - GLushort index16[MAX_WIDTH]; - void *values; - - if (rb->DataType == GL_UNSIGNED_BYTE) { - GLuint k; - for (k = 0; k < span->end; k++) { - index8[k] = (GLubyte) index32[k]; - } - values = index8; - } - else if (rb->DataType == GL_UNSIGNED_SHORT) { - GLuint k; - for (k = 0; k < span->end; k++) { - index16[k] = (GLushort) index32[k]; - } - values = index16; - } - else { - ASSERT(rb->DataType == GL_UNSIGNED_INT); - values = index32; - } - - if (span->arrayMask & SPAN_XY) { - rb->PutValues(ctx, rb, span->end, span->array->x, span->array->y, - values, span->array->mask); - } - else { - rb->PutRow(ctx, rb, span->end, span->x, span->y, - values, span->array->mask); - } - } - } - -#if OLD_RENDERBUFFER - /* restore default dest buffer */ - _swrast_use_draw_buffer(ctx); -#endif - - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; -} - - -/** - * Add specular color to base color. This is used only when - * GL_LIGHT_MODEL_COLOR_CONTROL = GL_SEPARATE_SPECULAR_COLOR. - */ -static void -add_colors(GLuint n, GLchan rgba[][4], GLchan specular[][4] ) -{ - GLuint i; - for (i = 0; i < n; i++) { -#if CHAN_TYPE == GL_FLOAT - /* no clamping */ - rgba[i][RCOMP] += specular[i][RCOMP]; - rgba[i][GCOMP] += specular[i][GCOMP]; - rgba[i][BCOMP] += specular[i][BCOMP]; -#else - GLint r = rgba[i][RCOMP] + specular[i][RCOMP]; - GLint g = rgba[i][GCOMP] + specular[i][GCOMP]; - GLint b = rgba[i][BCOMP] + specular[i][BCOMP]; - rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); - rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); - rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); -#endif - } -} - - -/** - * XXX merge this code into the _swrast_write_rgba_span() routine! - * - * Draw to more than one RGBA color buffer (or none). - * All fragment operations, up to (but not) blending/logicop should - * have been done first. - */ -static void -multi_write_rgba_span( GLcontext *ctx, struct sw_span *span ) -{ -#if OLD_RENDERBUFFER - SWcontext *swrast = SWRAST_CONTEXT(ctx); -#endif - const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask); - struct gl_framebuffer *fb = ctx->DrawBuffer; - const GLuint output = 0; - GLuint i; - - ASSERT(span->end < MAX_WIDTH); - ASSERT(colorMask != 0x0); - - for (i = 0; i < fb->_NumColorDrawBuffers[output]; i++) { - struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[output][i]; - GLchan rgbaTmp[MAX_WIDTH][4]; - -#if OLD_RENDERBUFFER - /* obsolete code */ - GLuint bufferBit = fb->_ColorDrawBit[output][i]; - /* Set the current read/draw buffer */ - swrast->CurrentBufferBit = bufferBit; - if (swrast->Driver.SetBuffer) - (*swrast->Driver.SetBuffer)(ctx, ctx->DrawBuffer, bufferBit); -#endif - - /* make copy of incoming colors */ - MEMCPY( rgbaTmp, span->array->rgba, 4 * span->end * sizeof(GLchan) ); - - if (ctx->Color._LogicOpEnabled) { - _swrast_logicop_rgba_span(ctx, rb, span, rgbaTmp); - } - else if (ctx->Color.BlendEnabled) { - _swrast_blend_span(ctx, rb, span, rgbaTmp); - } - - if (colorMask != 0xffffffff) { - _swrast_mask_rgba_span(ctx, rb, span, rgbaTmp); - } - - if (span->arrayMask & SPAN_XY) { - /* array of pixel coords */ - ASSERT(rb->PutValues); - rb->PutValues(ctx, rb, span->end, span->array->x, - span->array->y, rgbaTmp, span->array->mask); - } - else { - /* horizontal run of pixels */ - ASSERT(rb->PutRow); - rb->PutRow(ctx, rb, span->end, span->x, span->y, rgbaTmp, - span->array->mask); - } - } - -#if OLD_RENDERBUFFER - /* restore default dest buffer */ - _swrast_use_draw_buffer(ctx); -#endif -} - - -/** - * Apply all the per-fragment operations to a span. - * This now includes texturing (_swrast_write_texture_span() is history). - * This function may modify any of the array values in the span. - * span->interpMask and span->arrayMask may be changed but will be restored - * to their original values before returning. - */ -void -_swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span) -{ - const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask); - SWcontext *swrast = SWRAST_CONTEXT(ctx); - const GLuint origInterpMask = span->interpMask; - const GLuint origArrayMask = span->arrayMask; - const GLboolean deferredTexture = !(ctx->Color.AlphaEnabled || - ctx->FragmentProgram._Active || - ctx->ATIFragmentShader._Enabled); - - ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE || - span->primitive == GL_POLYGON || span->primitive == GL_BITMAP); - ASSERT(span->end <= MAX_WIDTH); - ASSERT((span->interpMask & span->arrayMask) == 0); - - /* - printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, - span->interpMask, span->arrayMask); - */ - - if (span->arrayMask & SPAN_MASK) { - /* mask was initialized by caller, probably glBitmap */ - span->writeAll = GL_FALSE; - } - else { - _mesa_memset(span->array->mask, 1, span->end); - span->writeAll = GL_TRUE; - } - - /* Clip to window/scissor box */ - if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) { - if (!clip_span(ctx, span)) { - return; - } - } - -#ifdef DEBUG - /* Make sure all fragments are within window bounds */ - if (span->arrayMask & SPAN_XY) { - GLuint i; - for (i = 0; i < span->end; i++) { - if (span->array->mask[i]) { - assert(span->array->x[i] >= ctx->DrawBuffer->_Xmin); - assert(span->array->x[i] < ctx->DrawBuffer->_Xmax); - assert(span->array->y[i] >= ctx->DrawBuffer->_Ymin); - assert(span->array->y[i] < ctx->DrawBuffer->_Ymax); - } - } - } -#endif - - /* Polygon Stippling */ - if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) { - stipple_polygon_span(ctx, span); - } - - /* Interpolate texcoords? */ - if (ctx->Texture._EnabledCoordUnits - && (span->interpMask & SPAN_TEXTURE) - && (span->arrayMask & SPAN_TEXTURE) == 0) { - interpolate_texcoords(ctx, span); - } - - /* This is the normal place to compute the resulting fragment color/Z. - * As an optimization, we try to defer this until after Z/stencil - * testing in order to try to avoid computing colors that we won't - * actually need. - */ - if (!deferredTexture) { - /* Now we need the rgba array, fill it in if needed */ - if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) - interpolate_colors(ctx, span); - - if (span->interpMask & SPAN_SPEC) - interpolate_specular(ctx, span); - - if (span->interpMask & SPAN_FOG) - interpolate_fog(ctx, span); - - /* Compute fragment colors with fragment program or texture lookups */ - if (ctx->FragmentProgram._Active) { - /* frag prog may need Z values */ - if (span->interpMask & SPAN_Z) - _swrast_span_interpolate_z(ctx, span); - _swrast_exec_fragment_program( ctx, span ); - } - else if (ctx->ATIFragmentShader._Enabled) - _swrast_exec_fragment_shader( ctx, span ); - else if (ctx->Texture._EnabledUnits && (span->arrayMask & SPAN_TEXTURE)) - _swrast_texture_span( ctx, span ); - - /* Do the alpha test */ - if (!_swrast_alpha_test(ctx, span)) { - span->arrayMask = origArrayMask; - return; - } - } - - /* Stencil and Z testing */ - if (ctx->Stencil.Enabled || ctx->Depth.Test) { - if (span->interpMask & SPAN_Z) - _swrast_span_interpolate_z(ctx, span); - - if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) { - /* Combined Z/stencil tests */ - if (!_swrast_stencil_and_ztest_span(ctx, span)) { - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; - return; - } - } - else if (ctx->DrawBuffer->Visual.depthBits > 0) { - /* Just regular depth testing */ - ASSERT(ctx->Depth.Test); - ASSERT(span->arrayMask & SPAN_Z); - if (!_swrast_depth_test_span(ctx, span)) { - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; - return; - } - } - } - - /* if we get here, some fragments passed the depth test */ - if (ctx->Depth.OcclusionTest) { - ctx->OcclusionResult = GL_TRUE; - } - -#if FEATURE_ARB_occlusion_query - if (ctx->Occlusion.Active) { - /* update count of 'passed' fragments */ - GLuint i; - for (i = 0; i < span->end; i++) - ctx->Occlusion.PassedCounter += span->array->mask[i]; - } -#endif - - /* We had to wait until now to check for glColorMask(0,0,0,0) because of - * the occlusion test. - */ - if (colorMask == 0x0) { - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; - return; - } - - /* If we were able to defer fragment color computation to now, there's - * a good chance that many fragments will have already been killed by - * Z/stencil testing. - */ - if (deferredTexture) { - /* Now we need the rgba array, fill it in if needed */ - if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) - interpolate_colors(ctx, span); - - if (span->interpMask & SPAN_SPEC) - interpolate_specular(ctx, span); - - if (span->interpMask & SPAN_FOG) - interpolate_fog(ctx, span); - - if (ctx->FragmentProgram._Active) - _swrast_exec_fragment_program( ctx, span ); - else if (ctx->ATIFragmentShader._Enabled) - _swrast_exec_fragment_shader( ctx, span ); - else if (ctx->Texture._EnabledUnits && (span->arrayMask & SPAN_TEXTURE)) - _swrast_texture_span( ctx, span ); - } - - ASSERT(span->arrayMask & SPAN_RGBA); - - if (!ctx->FragmentProgram._Enabled) { - /* Add base and specular colors */ - if (ctx->Fog.ColorSumEnabled || - (ctx->Light.Enabled && - ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) { - if (span->interpMask & SPAN_SPEC) { - interpolate_specular(ctx, span); - } - if (span->arrayMask & SPAN_SPEC) { - add_colors( span->end, span->array->rgba, span->array->spec ); - } - else { - /* We probably added the base/specular colors during the - * vertex stage! - */ - } - } - } - - /* Fog */ - if (swrast->_FogEnabled) { - _swrast_fog_rgba_span(ctx, span); - } - - /* Antialias coverage application */ - if (span->arrayMask & SPAN_COVERAGE) { - GLchan (*rgba)[4] = span->array->rgba; - GLfloat *coverage = span->array->coverage; - GLuint i; - for (i = 0; i < span->end; i++) { - rgba[i][ACOMP] = (GLchan) (rgba[i][ACOMP] * coverage[i]); - } - } - - if (swrast->_RasterMask & MULTI_DRAW_BIT) { - /* need to do blend/logicop separately for each color buffer */ - multi_write_rgba_span(ctx, span); - } - else { - /* normal: write to exactly one buffer */ - struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0][0]; - - if (ctx->Color._LogicOpEnabled) { - _swrast_logicop_rgba_span(ctx, rb, span, span->array->rgba); - } - else if (ctx->Color.BlendEnabled) { - _swrast_blend_span(ctx, rb, span, span->array->rgba); - } - - /* Color component masking */ - if (colorMask != 0xffffffff) { - _swrast_mask_rgba_span(ctx, rb, span, span->array->rgba); - } - - /* Finally, write the pixels to a color buffer */ - if (span->arrayMask & SPAN_XY) { - /* array of pixel coords */ - ASSERT(rb->PutValues); - ASSERT(rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RGBA); - /* XXX check datatype */ - rb->PutValues(ctx, rb, span->end, span->array->x, span->array->y, - span->array->rgba, span->array->mask); - } - else { - /* horizontal run of pixels */ - ASSERT(rb->PutRow); - ASSERT(rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RGBA); - /* XXX check datatype */ - rb->PutRow(ctx, rb, span->end, span->x, span->y, span->array->rgba, - span->writeAll ? NULL : span->array->mask); - } - } - - span->interpMask = origInterpMask; - span->arrayMask = origArrayMask; -} - - - -/** - * Read RGBA pixels from frame buffer. Clipping will be done to prevent - * reading ouside the buffer's boundaries. - */ -void -_swrast_read_rgba_span( GLcontext *ctx, struct gl_renderbuffer *rb, - GLuint n, GLint x, GLint y, GLchan rgba[][4] ) -{ - const GLint bufWidth = (GLint) rb->Width; - const GLint bufHeight = (GLint) rb->Height; - - if (y < 0 || y >= bufHeight || x + (GLint) n < 0 || x >= bufWidth) { - /* completely above, below, or right */ - /* XXX maybe leave rgba values undefined? */ - _mesa_bzero(rgba, 4 * n * sizeof(GLchan)); - } - else { - GLint skip, length; - if (x < 0) { - /* left edge clipping */ - skip = -x; - length = (GLint) n - skip; - if (length < 0) { - /* completely left of window */ - return; - } - if (length > bufWidth) { - length = bufWidth; - } - } - else if ((GLint) (x + n) > bufWidth) { - /* right edge clipping */ - skip = 0; - length = bufWidth - x; - if (length < 0) { - /* completely to right of window */ - return; - } - } - else { - /* no clipping */ - skip = 0; - length = (GLint) n; - } - - ASSERT(rb); - ASSERT(rb->GetRow); - ASSERT(rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RGBA); - ASSERT(rb->DataType == GL_UNSIGNED_BYTE); - rb->GetRow(ctx, rb, length, x + skip, y, rgba + skip); - } -} - - -/** - * Read CI pixels from frame buffer. Clipping will be done to prevent - * reading ouside the buffer's boundaries. - */ -void -_swrast_read_index_span( GLcontext *ctx, struct gl_renderbuffer *rb, - GLuint n, GLint x, GLint y, GLuint index[] ) -{ - const GLint bufWidth = (GLint) rb->Width; - const GLint bufHeight = (GLint) rb->Height; - - if (y < 0 || y >= bufHeight || x + (GLint) n < 0 || x >= bufWidth) { - /* completely above, below, or right */ - _mesa_bzero(index, n * sizeof(GLuint)); - } - else { - GLint skip, length; - if (x < 0) { - /* left edge clipping */ - skip = -x; - length = (GLint) n - skip; - if (length < 0) { - /* completely left of window */ - return; - } - if (length > bufWidth) { - length = bufWidth; - } - } - else if ((GLint) (x + n) > bufWidth) { - /* right edge clipping */ - skip = 0; - length = bufWidth - x; - if (length < 0) { - /* completely to right of window */ - return; - } - } - else { - /* no clipping */ - skip = 0; - length = (GLint) n; - } - - ASSERT(rb->GetRow); - ASSERT(rb->_BaseFormat == GL_COLOR_INDEX); - - if (rb->DataType == GL_UNSIGNED_BYTE) { - GLubyte index8[MAX_WIDTH]; - GLint i; - rb->GetRow(ctx, rb, length, x + skip, y, index8); - for (i = 0; i < length; i++) - index[skip + i] = index8[i]; - } - else if (rb->DataType == GL_UNSIGNED_SHORT) { - GLushort index16[MAX_WIDTH]; - GLint i; - rb->GetRow(ctx, rb, length, x + skip, y, index16); - for (i = 0; i < length; i++) - index[skip + i] = index16[i]; - } - else if (rb->DataType == GL_UNSIGNED_INT) { - rb->GetRow(ctx, rb, length, x + skip, y, index + skip); - } - } -} - - -/** - * Wrapper for gl_renderbuffer::GetValues() which does clipping to avoid - * reading values outside the buffer bounds. - * We can use this for reading any format/type of renderbuffer. - * \param valueSize is the size in bytes of each value put into the - * values array. - */ -void -_swrast_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, - GLuint count, const GLint x[], const GLint y[], - void *values, GLuint valueSize) -{ - GLuint i, inCount = 0, inStart = 0; - - for (i = 0; i < count; i++) { - if (x[i] >= 0 && y[i] >= 0 && x[i] < rb->Width && y[i] < rb->Height) { - /* inside */ - if (inCount == 0) - inStart = i; - inCount++; - } - else { - if (inCount > 0) { - /* read [inStart, inStart + inCount) */ - rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, - (GLubyte *) values + inStart * valueSize); - inCount = 0; - } - } - } - if (inCount > 0) { - /* read last values */ - rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, - (GLubyte *) values + inStart * valueSize); - } -} |