}
-
/**
- * Calculate fog factors (in [0,1]) from window z values
- * Input: n - number of pixels
- * z - array of integer depth values
- * red, green, blue, alpha - pixel colors
- * Output: red, green, blue, alpha - fogged pixel colors
- *
- * Use lookup table & interpolation?
+ * Apply fog to a span of RGBA pixels.
+ * The fog value are either in the span->array->fog array or interpolated from
+ * the fog/fogStep values.
+ * They fog values are either fog coordinates (Z) or fog blend factors.
+ * _PreferPixelFog should be in sync with that state!
*/
-static void
-compute_fog_factors_from_z( const GLcontext *ctx,
- GLuint n,
- const GLdepth z[],
- GLfloat fogFact[] )
+void
+_swrast_fog_rgba_span( const GLcontext *ctx, struct sw_span *span )
{
- const GLfloat *proj = ctx->ProjectionMatrixStack.Top->m;
- const GLboolean ortho = (proj[15] != 0.0F);
- const GLfloat p10 = proj[10];
- const GLfloat p14 = proj[14];
- const GLfloat tz = ctx->Viewport._WindowMap.m[MAT_TZ];
- GLfloat szInv;
- GLuint i;
+ const SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLchan rFog = swrast->_FogColor[RCOMP];
+ const GLchan gFog = swrast->_FogColor[GCOMP];
+ const GLchan bFog = swrast->_FogColor[BCOMP];
+ const GLuint haveW = (span->interpMask & SPAN_W);
+ GLchan (*rgba)[4] = (GLchan (*)[4]) span->array->rgba;
- if (ctx->Viewport._WindowMap.m[MAT_SZ] == 0.0)
- szInv = 1.0F;
- else
- szInv = 1.0F / ctx->Viewport._WindowMap.m[MAT_SZ];
+ ASSERT(swrast->_FogEnabled);
+ ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
+ ASSERT(span->arrayMask & SPAN_RGBA);
- /*
- * Note: to compute eyeZ from the ndcZ we have to solve the following:
- *
- * p[10] * eyeZ + p[14] * eyeW
- * ndcZ = ---------------------------
- * p[11] * eyeZ + p[15] * eyeW
- *
- * Thus:
- *
- * p[14] * eyeW - p[15] * eyeW * ndcZ
- * eyeZ = ----------------------------------
- * p[11] * ndcZ - p[10]
- *
- * If we note:
- * a) if using an orthographic projection, p[11] = 0 and p[15] = 1.
- * b) if using a perspective projection, p[11] = -1 and p[15] = 0.
- * c) we assume eyeW = 1 (not always true- glVertex4)
- *
- * Then we can simplify the calculation of eyeZ quite a bit. We do
- * separate calculations for the orthographic and perspective cases below.
- * Note that we drop a negative sign or two since they don't matter.
+ /* NOTE: if haveW is true, that means the fog start/step values are
+ * perspective-corrected and we have to divide each fog coord by W.
*/
- switch (ctx->Fog.Mode) {
+ /* we need to compute fog blend factors */
+ if (swrast->_PreferPixelFog) {
+ /* The span's fog values are fog coordinates, now compute blend factors
+ * and blend the fragment colors with the fog color.
+ */
+ switch (ctx->Fog.Mode) {
case GL_LINEAR:
{
- GLfloat fogEnd = ctx->Fog.End;
- GLfloat fogScale;
- if (ctx->Fog.Start == ctx->Fog.End)
- fogScale = 1.0;
- else
- fogScale = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
- if (ortho) {
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = (ndcz - p14) / p10;
- GLfloat f;
- if (eyez < 0.0)
- eyez = -eyez;
- f = (fogEnd - eyez) * fogScale;
- fogFact[i] = CLAMP(f, 0.0F, 1.0F);
- }
- }
- else {
- /* perspective */
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = p14 / (ndcz + p10);
- GLfloat f;
- if (eyez < 0.0)
- eyez = -eyez;
- f = (fogEnd - eyez) * fogScale;
- fogFact[i] = CLAMP(f, 0.0F, 1.0F);
- }
+ const GLfloat fogEnd = ctx->Fog.End;
+ const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End)
+ ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start);
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ GLfloat f, oneMinusF;
+ f = (fogEnd - FABSF(fogCoord/w)) * fogScale;
+ f = CLAMP(f, 0.0F, 1.0F);
+ oneMinusF = 1.0F - f;
+ rgba[i][RCOMP] = (GLchan) (f * rgba[i][RCOMP] + oneMinusF * rFog);
+ rgba[i][GCOMP] = (GLchan) (f * rgba[i][GCOMP] + oneMinusF * gFog);
+ rgba[i][BCOMP] = (GLchan) (f * rgba[i][BCOMP] + oneMinusF * bFog);
+ fogCoord += fogStep;
+ w += wStep;
}
}
- break;
+ break;
case GL_EXP:
- if (ortho) {
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = (ndcz - p14) / p10;
- if (eyez < 0.0)
- eyez = -eyez;
- fogFact[i] = (GLfloat) exp( -ctx->Fog.Density * eyez );
- }
- }
- else {
- /* perspective */
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = p14 / (ndcz + p10);
- if (eyez < 0.0)
- eyez = -eyez;
- fogFact[i] = (GLfloat) exp( -ctx->Fog.Density * eyez );
+ {
+ const GLfloat density = -ctx->Fog.Density;
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ GLfloat f, oneMinusF;
+ f = (GLfloat) exp(density * FABSF(fogCoord/w));
+ oneMinusF = 1.0F - f;
+ rgba[i][RCOMP] = (GLchan) (f * rgba[i][RCOMP] + oneMinusF * rFog);
+ rgba[i][GCOMP] = (GLchan) (f * rgba[i][GCOMP] + oneMinusF * gFog);
+ rgba[i][BCOMP] = (GLchan) (f * rgba[i][BCOMP] + oneMinusF * bFog);
+ fogCoord += fogStep;
+ w += wStep;
}
}
- break;
+ break;
case GL_EXP2:
{
- GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
- if (ortho) {
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = (ndcz - p14) / p10;
- GLfloat tmp = negDensitySquared * eyez * eyez;
+ const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ const GLfloat coord = fogCoord / w;
+ GLfloat tmp = negDensitySquared * coord * coord;
+ GLfloat f, oneMinusF;
#if defined(__alpha__) || defined(__alpha)
- /* XXX this underflow check may be needed for other systems*/
- if (tmp < FLT_MIN_10_EXP)
- tmp = FLT_MIN_10_EXP;
+ /* XXX this underflow check may be needed for other systems*/
+ if (tmp < FLT_MIN_10_EXP)
+ tmp = FLT_MIN_10_EXP;
#endif
- fogFact[i] = (GLfloat) exp( tmp );
- }
- }
- else {
- /* perspective */
- for (i=0;i<n;i++) {
- GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
- GLfloat eyez = p14 / (ndcz + p10);
- GLfloat tmp = negDensitySquared * eyez * eyez;
-#if defined(__alpha__) || defined(__alpha)
- /* XXX this underflow check may be needed for other systems*/
- if (tmp < FLT_MIN_10_EXP)
- tmp = FLT_MIN_10_EXP;
-#endif
- fogFact[i] = (GLfloat) exp( tmp );
- }
+ f = (GLfloat) exp(tmp);
+ f = CLAMP(f, 0.0F, 1.0F);
+ oneMinusF = 1.0F - f;
+ rgba[i][RCOMP] = (GLchan) (f * rgba[i][RCOMP] + oneMinusF * rFog);
+ rgba[i][GCOMP] = (GLchan) (f * rgba[i][GCOMP] + oneMinusF * gFog);
+ rgba[i][BCOMP] = (GLchan) (f * rgba[i][BCOMP] + oneMinusF * bFog);
+ fogCoord += fogStep;
+ w += wStep;
}
}
- break;
+ break;
default:
- _mesa_problem(ctx, "Bad fog mode in compute_fog_factors_from_z");
+ _mesa_problem(ctx, "Bad fog mode in _swrast_fog_rgba_span");
return;
+ }
}
-}
-
-
-
-/**
- * Apply fog to a span of RGBA pixels.
- * The fog factors are either in the span->array->fog or stored as base/step.
- * These are fog _factors_, not fog coords. Fog coords were converted to
- * fog factors per vertex.
- */
-void
-_swrast_fog_rgba_span( const GLcontext *ctx, struct sw_span *span )
-{
- const SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLuint n = span->end;
- GLchan (*rgba)[4] = (GLchan (*)[4]) span->array->rgba;
- GLchan rFog, gFog, bFog;
-
- ASSERT(ctx->Fog.Enabled);
- ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
- ASSERT(span->arrayMask & SPAN_RGBA);
-
- UNCLAMPED_FLOAT_TO_CHAN(rFog, ctx->Fog.Color[RCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(gFog, ctx->Fog.Color[GCOMP]);
- UNCLAMPED_FLOAT_TO_CHAN(bFog, ctx->Fog.Color[BCOMP]);
-
- if (swrast->_PreferPixelFog) {
- /* compute fog factor from each fragment's Z value */
- if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
- _swrast_span_interpolate_z(ctx, span);
- compute_fog_factors_from_z(ctx, n, span->array->z, span->array->fog);
- span->arrayMask |= SPAN_FOG;
- }
-
- if (span->arrayMask & SPAN_FOG) {
- /* use fog array in span */
+ else if (span->arrayMask & SPAN_FOG) {
+ /* The span's fog array values are blend factors.
+ * They were previously computed per-vertex.
+ */
GLuint i;
- for (i = 0; i < n; i++) {
- const GLfloat fog = span->array->fog[i];
- const GLfloat oneMinusFog = 1.0F - fog;
- rgba[i][RCOMP] = (GLchan) (fog * rgba[i][RCOMP] + oneMinusFog * rFog);
- rgba[i][GCOMP] = (GLchan) (fog * rgba[i][GCOMP] + oneMinusFog * gFog);
- rgba[i][BCOMP] = (GLchan) (fog * rgba[i][BCOMP] + oneMinusFog * bFog);
+ for (i = 0; i < span->end; i++) {
+ const GLfloat f = span->array->fog[i];
+ const GLfloat oneMinusF = 1.0F - f;
+ rgba[i][RCOMP] = (GLchan) (f * rgba[i][RCOMP] + oneMinusF * rFog);
+ rgba[i][GCOMP] = (GLchan) (f * rgba[i][GCOMP] + oneMinusF * gFog);
+ rgba[i][BCOMP] = (GLchan) (f * rgba[i][BCOMP] + oneMinusF * bFog);
}
}
else {
- /* interpolate fog factors */
- GLfloat fog = span->fog, dFog = span->fogStep;
+ /* The span's fog start/step values are blend factors.
+ * They were previously computed per-vertex.
+ */
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fog = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
GLuint i;
- for (i = 0; i < n; i++) {
- const GLfloat oneMinusFog = 1.0F - fog;
- rgba[i][RCOMP] = (GLchan) (fog * rgba[i][RCOMP] + oneMinusFog * rFog);
- rgba[i][GCOMP] = (GLchan) (fog * rgba[i][GCOMP] + oneMinusFog * gFog);
- rgba[i][BCOMP] = (GLchan) (fog * rgba[i][BCOMP] + oneMinusFog * bFog);
- fog += dFog;
+ ASSERT(span->interpMask & SPAN_FOG);
+ for (i = 0; i < span->end; i++) {
+ const GLfloat fact = fog / w;
+ const GLfloat oneMinusF = 1.0F - fact;
+ rgba[i][RCOMP] = (GLchan) (fact * rgba[i][RCOMP] + oneMinusF * rFog);
+ rgba[i][GCOMP] = (GLchan) (fact * rgba[i][GCOMP] + oneMinusF * gFog);
+ rgba[i][BCOMP] = (GLchan) (fact * rgba[i][BCOMP] + oneMinusF * bFog);
+ fog += fogStep;
+ w += wStep;
}
}
}
_swrast_fog_ci_span( const GLcontext *ctx, struct sw_span *span )
{
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLuint n = span->end;
+ const GLuint haveW = (span->interpMask & SPAN_W);
+ const GLuint fogIndex = (GLuint) ctx->Fog.Index;
GLuint *index = span->array->index;
- ASSERT(ctx->Fog.Enabled);
+ ASSERT(swrast->_FogEnabled);
ASSERT(span->arrayMask & SPAN_INDEX);
ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
+ /* we need to compute fog blend factors */
if (swrast->_PreferPixelFog) {
- /* compute fog factor from each fragment's Z value */
- if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
- _swrast_span_interpolate_z(ctx, span);
- compute_fog_factors_from_z(ctx, n, span->array->z, span->array->fog);
- span->arrayMask |= SPAN_FOG;
+ /* The span's fog values are fog coordinates, now compute blend factors
+ * and blend the fragment colors with the fog color.
+ */
+ switch (ctx->Fog.Mode) {
+ case GL_LINEAR:
+ {
+ const GLfloat fogEnd = ctx->Fog.End;
+ const GLfloat fogScale = (ctx->Fog.Start == ctx->Fog.End)
+ ? 1.0F : 1.0F / (ctx->Fog.End - ctx->Fog.Start);
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ GLfloat f = (fogEnd - FABSF(fogCoord/w)) * fogScale;
+ f = CLAMP(f, 0.0F, 1.0F);
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
+ fogCoord += fogStep;
+ w += wStep;
+ }
+ }
+ break;
+ case GL_EXP:
+ {
+ const GLfloat density = -ctx->Fog.Density;
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ GLfloat f = (GLfloat) exp(density * FABSF(fogCoord/w));
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
+ fogCoord += fogStep;
+ w += wStep;
+ }
+ }
+ break;
+ case GL_EXP2:
+ {
+ const GLfloat negDensitySquared = -ctx->Fog.Density * ctx->Fog.Density;
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fogCoord = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ const GLfloat coord = fogCoord / w;
+ GLfloat tmp = negDensitySquared * coord * coord;
+ GLfloat f;
+#if defined(__alpha__) || defined(__alpha)
+ /* XXX this underflow check may be needed for other systems*/
+ if (tmp < FLT_MIN_10_EXP)
+ tmp = FLT_MIN_10_EXP;
+#endif
+ f = (GLfloat) exp(tmp);
+ f = CLAMP(f, 0.0F, 1.0F);
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
+ fogCoord += fogStep;
+ w += wStep;
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad fog mode in _swrast_fog_ci_span");
+ return;
+ }
}
-
- if (span->arrayMask & SPAN_FOG) {
- const GLuint idx = (GLuint) ctx->Fog.Index;
+ else if (span->arrayMask & SPAN_FOG) {
+ /* The span's fog array values are blend factors.
+ * They were previously computed per-vertex.
+ */
GLuint i;
- for (i = 0; i < n; i++) {
- const GLfloat f = CLAMP(span->array->fog[i], 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
+ for (i = 0; i < span->end; i++) {
+ const GLfloat f = span->array->fog[i];
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
}
}
else {
- GLfloat fog = span->fog, dFog = span->fogStep;
- const GLuint idx = (GLuint) ctx->Fog.Index;
+ /* The span's fog start/step values are blend factors.
+ * They were previously computed per-vertex.
+ */
+ const GLfloat fogStep = span->fogStep;
+ GLfloat fog = span->fog;
+ const GLfloat wStep = haveW ? span->dwdx : 0.0F;
+ GLfloat w = haveW ? span->w : 1.0F;
GLuint i;
- for (i = 0; i < n; i++) {
- const GLfloat f = CLAMP(fog, 0.0F, 1.0F);
- index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * idx);
- fog += dFog;
+ ASSERT(span->interpMask & SPAN_FOG);
+ for (i = 0; i < span->end; i++) {
+ const GLfloat f = fog / w;
+ index[i] = (GLuint) ((GLfloat) index[i] + (1.0F - f) * fogIndex);
+ fog += fogStep;
+ w += wStep;
}
}
}
#endif
-static void init_static_data( void )
+/**
+ * Initialize the exp_table[] lookup table for approximating exp().
+ */
+static void
+init_static_data( void )
{
GLfloat f = 0.0F;
GLint i = 0;
* near and far clip plane distances).
* Fog blend factors are in the range [0,1].
*/
-static void compute_fog_blend_factors( GLcontext *ctx, GLvector4f *out,
- const GLvector4f *in )
+static void
+compute_fog_blend_factors(GLcontext *ctx, GLvector4f *out, const GLvector4f *in)
{
GLfloat end = ctx->Fog.End;
GLfloat *v = in->start;
else
d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) {
- GLfloat f = (end - FABSF(*v)) * d;
+ const GLfloat z = FABSF(*v);
+ GLfloat f = (end - z) * d;
data[i][0] = CLAMP(f, 0.0F, 1.0F);
}
break;
case GL_EXP:
d = ctx->Fog.Density;
- for ( i = 0 ; i < n ; i++, STRIDE_F(v,stride))
- NEG_EXP( data[i][0], d * FABSF(*v) );
+ for ( i = 0 ; i < n ; i++, STRIDE_F(v,stride)) {
+ const GLfloat z = FABSF(*v);
+ NEG_EXP( data[i][0], d * z );
+ }
break;
case GL_EXP2:
d = ctx->Fog.Density*ctx->Fog.Density;
for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) {
- GLfloat z = *v;
+ const GLfloat z = *v;
NEG_EXP( data[i][0], d * z * z );
}
break;
}
-static GLboolean run_fog_stage( GLcontext *ctx,
- struct tnl_pipeline_stage *stage )
+static GLboolean
+run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
{
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
struct fog_stage_data *store = FOG_STAGE_DATA(stage);
GLvector4f *input;
return GL_TRUE;
if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) {
- /* fog computed from Z depth */
+ /* Fog is computed from vertex or fragment Z values */
/* source = VB->ObjPtr or VB->EyePtr coords */
/* dest = VB->FogCoordPtr = fog stage private storage */
VB->FogCoordPtr = &store->fogcoord;
if (!ctx->_NeedEyeCoords) {
+ /* compute fog coords from object coords */
const GLfloat *m = ctx->ModelviewMatrixStack.Top->m;
GLfloat plane[4];
input->count = VB->ObjPtr->count;
}
else {
+ /* fog coordinates = eye Z coordinates (use ABS later) */
input = &store->input;
if (VB->EyePtr->size < 2)
}
else {
/* use glFogCoord() coordinates */
- /* source = VB->FogCoordPtr */
- input = VB->FogCoordPtr;
- /* dest = fog stage private storage */
- VB->FogCoordPtr = &store->fogcoord;
+ input = VB->FogCoordPtr; /* source data */
+ VB->FogCoordPtr = &store->fogcoord; /* dest data */
}
- /* compute blend factors from fog coordinates */
- compute_fog_blend_factors( ctx, VB->FogCoordPtr, input );
+ if (tnl->_DoVertexFog) {
+ /* compute blend factors from fog coordinates */
+ compute_fog_blend_factors( ctx, VB->FogCoordPtr, input );
+ }
+ else {
+ /* results = incoming fog coords (compute fog per-fragment later) */
+ VB->FogCoordPtr = input;
+ }
VB->AttribPtr[_TNL_ATTRIB_FOG] = VB->FogCoordPtr;
return GL_TRUE;
}
-static void check_fog_stage( GLcontext *ctx, struct tnl_pipeline_stage *stage )
+static void
+check_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
{
stage->active = ctx->Fog.Enabled && !ctx->VertexProgram.Enabled;
/* Called the first time stage->run() is invoked.
*/
-static GLboolean alloc_fog_data( GLcontext *ctx,
- struct tnl_pipeline_stage *stage )
+static GLboolean
+alloc_fog_data(GLcontext *ctx, struct tnl_pipeline_stage *stage)
{
TNLcontext *tnl = TNL_CONTEXT(ctx);
struct fog_stage_data *store;
}
-static void free_fog_data( struct tnl_pipeline_stage *stage )
+static void
+free_fog_data(struct tnl_pipeline_stage *stage)
{
struct fog_stage_data *store = FOG_STAGE_DATA(stage);
if (store) {
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