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-rw-r--r--src/mesa/swrast/s_aalinetemp.h1
-rw-r--r--src/mesa/swrast/s_aatritemp.h5
-rw-r--r--src/mesa/swrast/s_context.c17
-rw-r--r--src/mesa/swrast/s_context.h4
-rw-r--r--src/mesa/swrast/s_fragprog.c2
-rw-r--r--src/mesa/swrast/s_linetemp.h3
-rw-r--r--src/mesa/swrast/s_pointtemp.h1
-rw-r--r--src/mesa/swrast/s_triangle.c2
-rw-r--r--src/mesa/swrast/s_tritemp.h9
-rw-r--r--src/mesa/swrast/swrast.h7
10 files changed, 40 insertions, 11 deletions
diff --git a/src/mesa/swrast/s_aalinetemp.h b/src/mesa/swrast/s_aalinetemp.h
index 80cec0b31d4..074ffe8c9b1 100644
--- a/src/mesa/swrast/s_aalinetemp.h
+++ b/src/mesa/swrast/s_aalinetemp.h
@@ -141,6 +141,7 @@ NAME(line)(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
return;
INIT_SPAN(line.span, GL_LINE, 0, 0, SPAN_XY | SPAN_COVERAGE);
+ line.span.facing = swrast->PointLineFacing;
line.xAdj = line.dx / line.len * line.halfWidth;
line.yAdj = line.dy / line.len * line.halfWidth;
diff --git a/src/mesa/swrast/s_aatritemp.h b/src/mesa/swrast/s_aatritemp.h
index 9278b5a157a..b26f21f5db0 100644
--- a/src/mesa/swrast/s_aatritemp.h
+++ b/src/mesa/swrast/s_aatritemp.h
@@ -78,7 +78,7 @@
GLfloat texWidth[FRAG_ATTRIB_MAX];
GLfloat texHeight[FRAG_ATTRIB_MAX];
#endif
- GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceSign;
+ GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;
(void) swrast;
@@ -116,6 +116,7 @@
majDx = vMax->win[0] - vMin->win[0];
majDy = vMax->win[1] - vMin->win[1];
+ /* front/back-face determination and cullling */
{
const GLfloat botDx = vMid->win[0] - vMin->win[0];
const GLfloat botDy = vMid->win[1] - vMin->win[1];
@@ -124,6 +125,8 @@
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:
diff --git a/src/mesa/swrast/s_context.c b/src/mesa/swrast/s_context.c
index 2f25edbd811..47d5035c02e 100644
--- a/src/mesa/swrast/s_context.c
+++ b/src/mesa/swrast/s_context.c
@@ -117,8 +117,8 @@ _swrast_update_rasterflags( GLcontext *ctx )
/**
- * Examine polycon culls tate to compute the _BackfaceSign field.
- * _BackfaceSign will be 0 if no culling, -1 if culling back-faces,
+ * Examine polycon culls tate to compute the _BackfaceCullSign field.
+ * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
* and 1 if culling front-faces. The Polygon FrontFace state also
* factors in.
*/
@@ -149,10 +149,15 @@ _swrast_update_polygon( GLcontext *ctx )
backface_sign = 0.0;
}
- SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
+ SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
+
+ /* This is for front/back-face determination, but not for culling */
+ SWRAST_CONTEXT(ctx)->_BackfaceSign
+ = (ctx->Polygon.FrontFace == GL_CW) ? -1.0 : 1.0;
}
+
/**
* Update the _PreferPixelFog field to indicate if we need to compute
* fog blend factors (from the fog coords) per-fragment.
@@ -721,6 +726,12 @@ _swrast_ResetLineStipple( GLcontext *ctx )
}
void
+_swrast_SetFacing(GLcontext *ctx, GLuint facing)
+{
+ SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
+}
+
+void
_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
{
if (SWRAST_DEBUG) {
diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h
index c8333b8e0a1..58841ad4af9 100644
--- a/src/mesa/swrast/s_context.h
+++ b/src/mesa/swrast/s_context.h
@@ -128,7 +128,8 @@ typedef struct
* _swrast_validate_derived():
*/
GLbitfield _RasterMask;
- GLfloat _BackfaceSign;
+ GLfloat _BackfaceSign; /** +1 or -1 */
+ GLfloat _BackfaceCullSign; /** +1, 0, or -1 */
GLboolean _PreferPixelFog; /* Compute fog blend factor per fragment? */
GLboolean _AnyTextureCombine;
GLboolean _FogEnabled;
@@ -151,6 +152,7 @@ typedef struct
/* Working values:
*/
GLuint StippleCounter; /**< Line stipple counter */
+ GLuint PointLineFacing;
GLbitfield NewState;
GLuint StateChanges;
GLenum Primitive; /* current primitive being drawn (ala glBegin) */
diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index 7fd94c87096..324afb9c761 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -118,7 +118,7 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine,
if (ctx->Shader.CurrentProgram) {
/* Store front/back facing value in register FOGC.Y */
- machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) ctx->_Facing;
+ machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) span->facing;
}
machine->CurElement = col;
diff --git a/src/mesa/swrast/s_linetemp.h b/src/mesa/swrast/s_linetemp.h
index b6e8f287f45..9e240a7d2bb 100644
--- a/src/mesa/swrast/s_linetemp.h
+++ b/src/mesa/swrast/s_linetemp.h
@@ -317,6 +317,9 @@ NAME( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 )
span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F;
span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F;
+ span.facing = swrast->PointLineFacing;
+
+
/*
* Draw
*/
diff --git a/src/mesa/swrast/s_pointtemp.h b/src/mesa/swrast/s_pointtemp.h
index 94364643d4b..7dcc1fc9449 100644
--- a/src/mesa/swrast/s_pointtemp.h
+++ b/src/mesa/swrast/s_pointtemp.h
@@ -105,6 +105,7 @@ NAME ( GLcontext *ctx, const SWvertex *vert )
*/
span->interpMask = SPAN_FOG;
span->arrayMask = SPAN_XY | SPAN_Z;
+ span->facing = swrast->PointLineFacing;
span->attrStart[FRAG_ATTRIB_FOGC][0] = vert->attrib[FRAG_ATTRIB_FOGC][0];
span->attrStepX[FRAG_ATTRIB_FOGC][0] = 0.0;
span->attrStepY[FRAG_ATTRIB_FOGC][0] = 0.0;
diff --git a/src/mesa/swrast/s_triangle.c b/src/mesa/swrast/s_triangle.c
index fc9d29bbf7f..fc40084bebd 100644
--- a/src/mesa/swrast/s_triangle.c
+++ b/src/mesa/swrast/s_triangle.c
@@ -58,7 +58,7 @@ _swrast_culltriangle( GLcontext *ctx,
GLfloat fy = v2->win[1] - v0->win[1];
GLfloat c = ex*fy-ey*fx;
- if (c * SWRAST_CONTEXT(ctx)->_BackfaceSign > 0)
+ if (c * SWRAST_CONTEXT(ctx)->_BackfaceCullSign > 0)
return 0;
return 1;
diff --git a/src/mesa/swrast/s_tritemp.h b/src/mesa/swrast/s_tritemp.h
index dcc3e958cb1..ae30fe5e597 100644
--- a/src/mesa/swrast/s_tritemp.h
+++ b/src/mesa/swrast/s_tritemp.h
@@ -172,7 +172,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
EdgeT eMaj, eTop, eBot;
GLfloat oneOverArea;
const SWvertex *vMin, *vMid, *vMax; /* Y(vMin)<=Y(vMid)<=Y(vMax) */
- GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceSign;
+ GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;
#if !TRIANGLE_WALK_DOUBLE
const GLint snapMask = ~((FIXED_ONE / (1 << SUB_PIXEL_BITS)) - 1); /* for x/y coord snapping */
#endif
@@ -293,6 +293,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
const GLfloat area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
#endif
/* Do backface culling */
+
if (area * bf < 0.0)
return;
@@ -300,10 +301,10 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
return;
oneOverArea = 1.0F / area;
- }
-
- span.facing = ctx->_Facing; /* for 2-sided stencil test */
+ /* 0 = front, 1 = back */
+ span.facing = oneOverArea * swrast->_BackfaceSign > 0.0F;
+ }
/* Edge setup. For a triangle strip these could be reused... */
{
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index 12264a159ad..86405503afc 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -140,6 +140,13 @@ _swrast_Accum(GLcontext *ctx, GLenum op, GLfloat value);
extern void
_swrast_ResetLineStipple( GLcontext *ctx );
+/**
+ * Indicates front/back facing for subsequent points/lines when drawing
+ * unfilled polygons. Needed for two-side stencil.
+ */
+extern void
+_swrast_SetFacing(GLcontext *ctx, GLuint facing);
+
/* These will always render the correct point/line/triangle for the
* current state.
*
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 12:29:37 +0000