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fix broken two-sided stencil

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This commit is contained in:
Brian
2007-11-30 13:01:57 -07:00
parent 44c8dac0af
commit fcd7c37fd3
15 changed files with 57 additions and 25 deletions
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1
src/mesa/main/context.c
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@@ -992,7 +992,6 @@ init_attrib_groups(GLcontext *ctx)
/* Miscellaneous */
ctx->NewState = _NEW_ALL;
ctx->ErrorValue = (GLenum) GL_NO_ERROR;
ctx->_Facing = 0;
return GL_TRUE;
}

6
src/mesa/main/mtypes.h
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@@ -3059,12 +3059,6 @@ struct __GLcontextRec
struct gl_list_extensions ListExt; /**< driver dlist extensions */
GLuint _Facing; /**< This is a hack for 2-sided stencil test.
*
* We don't have a better way to communicate this value from
* swrast_setup to swrast. */
/** \name For debugging/development only */
/*@{*/
GLboolean FirstTimeCurrent;

1
src/mesa/swrast/s_aalinetemp.h
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@@ -141,6 +141,7 @@ NAME(line)(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
INIT_SPAN(line.span, GL_LINE);
line.span.arrayMask = 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;

5
src/mesa/swrast/s_aatritemp.h
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@@ -65,7 +65,7 @@
GLfloat attrPlane[FRAG_ATTRIB_MAX][4][4];
GLfloat wPlane[4]; /* win[3] */
#endif
GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceSign;
GLfloat bf = SWRAST_CONTEXT(ctx)->_BackfaceCullSign;
(void) swrast;
@@ -104,6 +104,7 @@
majDx = vMax->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];
majDy = vMax->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];
/* front/back-face determination and cullling */
{
const GLfloat botDx = vMid->attrib[FRAG_ATTRIB_WPOS][0] - vMin->attrib[FRAG_ATTRIB_WPOS][0];
const GLfloat botDy = vMid->attrib[FRAG_ATTRIB_WPOS][1] - vMin->attrib[FRAG_ATTRIB_WPOS][1];
@@ -112,6 +113,8 @@
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:

17
src/mesa/swrast/s_context.c
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@@ -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.
@@ -763,6 +768,12 @@ _swrast_ResetLineStipple( GLcontext *ctx )
SWRAST_CONTEXT(ctx)->StippleCounter = 0;
}
void
_swrast_SetFacing(GLcontext *ctx, GLuint facing)
{
SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
}
void
_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
{

4
src/mesa/swrast/s_context.h
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@@ -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;
@@ -156,6 +157,7 @@ typedef struct
/* Working values:
*/
GLuint StippleCounter; /**< Line stipple counter */
GLuint PointLineFacing;
GLbitfield NewState;
GLuint StateChanges;
GLenum Primitive; /* current primitive being drawn (ala glBegin) */

2
src/mesa/swrast/s_fragprog.c
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@@ -120,7 +120,7 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine,
/* if running a GLSL program (not ARB_fragment_program) */
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;

3
src/mesa/swrast/s_linetemp.h
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@@ -308,6 +308,9 @@ NAME( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 )
span.interpMask = interpFlags;
span.arrayMask = SPAN_XY;
span.facing = swrast->PointLineFacing;
/*
* Draw
*/

10
src/mesa/swrast/s_points.c
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@@ -106,6 +106,8 @@ sprite_point(GLcontext *ctx, const SWvertex *vert)
INIT_SPAN(span, GL_POINT);
span.interpMask = SPAN_Z | SPAN_RGBA;
span.facing = swrast->PointLineFacing;
span.red = ChanToFixed(vert->color[0]);
span.green = ChanToFixed(vert->color[1]);
span.blue = ChanToFixed(vert->color[2]);
@@ -280,6 +282,8 @@ smooth_point(GLcontext *ctx, const SWvertex *vert)
span.interpMask = SPAN_Z | SPAN_RGBA;
span.arrayMask = SPAN_COVERAGE | SPAN_MASK;
span.facing = swrast->PointLineFacing;
span.red = ChanToFixed(vert->color[0]);
span.green = ChanToFixed(vert->color[1]);
span.blue = ChanToFixed(vert->color[2]);
@@ -386,6 +390,7 @@ large_point(GLcontext *ctx, const SWvertex *vert)
/* span init */
INIT_SPAN(span, GL_POINT);
span.arrayMask = SPAN_XY;
span.facing = swrast->PointLineFacing;
if (ciMode) {
span.interpMask = SPAN_Z | SPAN_INDEX;
@@ -492,7 +497,8 @@ pixel_point(GLcontext *ctx, const SWvertex *vert)
/* check if we need to flush */
if (span->end >= MAX_WIDTH ||
(swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT))) {
(swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT)) ||
span->facing != swrast->PointLineFacing) {
if (ciMode)
_swrast_write_index_span(ctx, span);
else
@@ -502,6 +508,8 @@ pixel_point(GLcontext *ctx, const SWvertex *vert)
count = span->end;
span->facing = swrast->PointLineFacing;
/* fragment attributes */
if (ciMode) {
span->array->index[count] = (GLuint) vert->attrib[FRAG_ATTRIB_CI][0];

2
src/mesa/swrast/s_triangle.c
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@@ -58,7 +58,7 @@ _swrast_culltriangle( GLcontext *ctx,
GLfloat fy = v2->attrib[FRAG_ATTRIB_WPOS][1] - v0->attrib[FRAG_ATTRIB_WPOS][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;

9
src/mesa/swrast/s_tritemp.h
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@@ -136,7 +136,7 @@ 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;
const GLint snapMask = ~((FIXED_ONE / (1 << SUB_PIXEL_BITS)) - 1); /* for x/y coord snapping */
GLfixed vMin_fx, vMin_fy, vMid_fx, vMid_fy, vMax_fx, vMax_fy;
@@ -235,6 +235,7 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
{
const GLfloat area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
/* Do backface culling */
if (area * bf < 0.0)
return;
@@ -242,11 +243,11 @@ static void NAME(GLcontext *ctx, const SWvertex *v0,
return;
oneOverArea = 1.0F / area;
/* 0 = front, 1 = back */
span.facing = oneOverArea * swrast->_BackfaceSign > 0.0F;
}
span.facing = ctx->_Facing; /* for 2-sided stencil test */
/* Edge setup. For a triangle strip these could be reused... */
{
eMaj.fsy = FixedCeil(vMin_fy);

7
src/mesa/swrast/swrast.h
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@@ -143,6 +143,13 @@ _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.
*

3
src/mesa/swrast_setup/ss_context.c
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@@ -201,6 +201,9 @@ _swsetup_RenderStart( GLcontext *ctx )
swsetup->NewState = 0;
/* This will change if drawing unfilled tris */
_swrast_SetFacing(ctx, 0);
_swrast_render_start(ctx);
/* Important */

10
src/mesa/swrast_setup/ss_triangle.c
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@@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.1
* Version: 7.1
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2007 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"),
@@ -68,6 +68,8 @@ static void _swsetup_render_line_tri( GLcontext *ctx,
return;
}
_swrast_SetFacing(ctx, facing);
if (ctx->Light.ShadeModel == GL_FLAT) {
COPY_CHAN4(c[0], v0->color);
COPY_CHAN4(c[1], v1->color);
@@ -127,6 +129,8 @@ static void _swsetup_render_point_tri( GLcontext *ctx,
return;
}
_swrast_SetFacing(ctx, facing);
if (ctx->Light.ShadeModel == GL_FLAT) {
/* save colors/indexes for v0, v1 vertices */
COPY_CHAN4(c[0], v0->color);
@@ -311,6 +315,4 @@ void _swsetup_choose_trifuncs( GLcontext *ctx )
tnl->Driver.Render.Quad = quad_tab[ind];
tnl->Driver.Render.Line = swsetup_line;
tnl->Driver.Render.Points = swsetup_points;
ctx->_Facing = 0;
}

2
src/mesa/swrast_setup/ss_tritmp.h
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@@ -49,7 +49,6 @@ static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
v[1] = &verts[e1];
v[2] = &verts[e2];
if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT))
{
GLfloat ex = v[0]->attrib[FRAG_ATTRIB_WPOS][0] - v[2]->attrib[FRAG_ATTRIB_WPOS][0];
@@ -61,7 +60,6 @@ static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT))
{
facing = (cc < 0.0) ^ ctx->Polygon._FrontBit;
ctx->_Facing = facing;
if (IND & SS_UNFILLED_BIT)
mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode;