#include "glheader.h"
#include "context.h"
#include "macros.h"
#include "imports.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_stencil.h"
#define STENCIL_ADDRESS(X,Y) \
(ctx->DrawBuffer->Stencil + ctx->DrawBuffer->Width * (Y) + (X))
static void
apply_stencil_op( const GLcontext *ctx, GLenum oper, GLuint face,
GLuint n, GLstencil stencil[], const GLubyte mask[] )
{
const GLstencil ref = ctx->Stencil.Ref[face];
const GLstencil wrtmask = ctx->Stencil.WriteMask[face];
const GLstencil invmask = (GLstencil) (~wrtmask);
GLuint i;
switch (oper) {
case GL_KEEP:
break;
case GL_ZERO:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
stencil[i] = 0;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
stencil[i] = (GLstencil) (stencil[i] & invmask);
}
}
}
break;
case GL_REPLACE:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
stencil[i] = ref;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
stencil[i] = (GLstencil) ((invmask & s ) | (wrtmask & ref));
}
}
}
break;
case GL_INCR:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
if (s < STENCIL_MAX) {
stencil[i] = (GLstencil) (s+1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
if (s < STENCIL_MAX) {
stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s+1)));
}
}
}
}
break;
case GL_DECR:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
if (s>0) {
stencil[i] = (GLstencil) (s-1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
if (s>0) {
stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s-1)));
}
}
}
}
break;
case GL_INCR_WRAP_EXT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
stencil[i]++;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s+1)));
}
}
}
break;
case GL_DECR_WRAP_EXT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
stencil[i]--;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s-1)));
}
}
}
break;
case GL_INVERT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
stencil[i] = (GLstencil) ~s;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & ~s));
}
}
}
break;
default:
_mesa_problem(ctx, "Bad stencil op in apply_stencil_op");
}
}
static GLboolean
do_stencil_test( GLcontext *ctx, GLuint face, GLuint n, GLstencil stencil[],
GLubyte mask[] )
{
GLubyte fail[MAX_WIDTH];
GLboolean allfail = GL_FALSE;
GLuint i;
GLstencil r, s;
const GLuint valueMask = ctx->Stencil.ValueMask[face];
ASSERT(n <= MAX_WIDTH);
switch (ctx->Stencil.Function[face]) {
case GL_NEVER:
for (i=0;i<n;i++) {
if (mask[i]) {
mask[i] = 0;
fail[i] = 1;
}
else {
fail[i] = 0;
}
}
allfail = GL_TRUE;
break;
case GL_LESS:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r < s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_LEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r <= s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_GREATER:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r > s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_GEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r >= s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_EQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r == s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_NOTEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
s = (GLstencil) (stencil[i] & valueMask);
if (r != s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_ALWAYS:
for (i=0;i<n;i++) {
fail[i] = 0;
}
break;
default:
_mesa_problem(ctx, "Bad stencil func in gl_stencil_span");
return 0;
}
if (ctx->Stencil.FailFunc[face] != GL_KEEP) {
apply_stencil_op( ctx, ctx->Stencil.FailFunc[face], face, n, stencil, fail );
}
return !allfail;
}
static GLboolean
stencil_and_ztest_span(GLcontext *ctx, struct sw_span *span, GLuint face)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLstencil stencilRow[MAX_WIDTH];
GLstencil *stencil;
const GLuint n = span->end;
const GLint x = span->x;
const GLint y = span->y;
GLubyte *mask = span->array->mask;
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(ctx->Stencil.Enabled);
ASSERT(n <= MAX_WIDTH);
#ifdef DEBUG
if (ctx->Depth.Test) {
ASSERT(span->arrayMask & SPAN_Z);
}
#endif
if (swrast->Driver.WriteStencilSpan) {
ASSERT(swrast->Driver.ReadStencilSpan);
(*swrast->Driver.ReadStencilSpan)(ctx, n, x, y, stencilRow);
stencil = stencilRow;
}
else {
stencil = STENCIL_ADDRESS(x, y);
}
if (do_stencil_test( ctx, face, n, stencil, mask ) == GL_FALSE) {
span->writeAll = GL_FALSE;
return GL_FALSE;
}
if (ctx->Depth.Test == GL_FALSE) {
apply_stencil_op( ctx, ctx->Stencil.ZPassFunc[face], face, n, stencil, mask );
}
else {
GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
GLuint i;
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
_mesa_depth_test_span(ctx, span);
for (i=0;i<n;i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
passmask[i] = oldmask[i] & mask[i];
failmask[i] = oldmask[i] & (mask[i] ^ 1);
}
if (ctx->Stencil.ZFailFunc[face] != GL_KEEP) {
apply_stencil_op( ctx, ctx->Stencil.ZFailFunc[face], face,
n, stencil, failmask );
}
if (ctx->Stencil.ZPassFunc[face] != GL_KEEP) {
apply_stencil_op( ctx, ctx->Stencil.ZPassFunc[face], face,
n, stencil, passmask );
}
}
if (swrast->Driver.WriteStencilSpan) {
ASSERT(stencil == stencilRow);
(swrast->Driver.WriteStencilSpan)(ctx, n, x, y, stencil, mask );
}
span->writeAll = GL_FALSE;
return GL_TRUE;
}
static void
apply_stencil_op_to_pixels( const GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLenum oper, GLuint face, const GLubyte mask[] )
{
const GLstencil ref = ctx->Stencil.Ref[face];
const GLstencil wrtmask = ctx->Stencil.WriteMask[face];
const GLstencil invmask = (GLstencil) (~wrtmask);
GLuint i;
ASSERT(!SWRAST_CONTEXT(ctx)->Driver.WriteStencilSpan);
switch (oper) {
case GL_KEEP:
break;
case GL_ZERO:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = 0;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) (invmask & *sptr);
}
}
}
break;
case GL_REPLACE:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = ref;
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) ((invmask & *sptr ) | (wrtmask & ref));
}
}
}
break;
case GL_INCR:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
if (*sptr < STENCIL_MAX) {
*sptr = (GLstencil) (*sptr + 1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
if (*sptr < STENCIL_MAX) {
*sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr+1)));
}
}
}
}
break;
case GL_DECR:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
if (*sptr>0) {
*sptr = (GLstencil) (*sptr - 1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
if (*sptr>0) {
*sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr-1)));
}
}
}
}
break;
case GL_INCR_WRAP_EXT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) (*sptr + 1);
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr+1)));
}
}
}
break;
case GL_DECR_WRAP_EXT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) (*sptr - 1);
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr-1)));
}
}
}
break;
case GL_INVERT:
if (invmask==0) {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) (~*sptr);
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
*sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & ~*sptr));
}
}
}
break;
default:
_mesa_problem(ctx, "Bad stencilop in apply_stencil_op_to_pixels");
}
}
static GLboolean
stencil_test_pixels( GLcontext *ctx, GLuint face, GLuint n,
const GLint x[], const GLint y[], GLubyte mask[] )
{
GLubyte fail[MAX_WIDTH];
GLstencil r, s;
GLuint i;
GLboolean allfail = GL_FALSE;
const GLuint valueMask = ctx->Stencil.ValueMask[face];
ASSERT(ctx->DrawBuffer->UseSoftwareStencilBuffer);
ASSERT(!SWRAST_CONTEXT(ctx)->Driver.ReadStencilSpan);
ASSERT(!SWRAST_CONTEXT(ctx)->Driver.WriteStencilSpan);
switch (ctx->Stencil.Function[face]) {
case GL_NEVER:
for (i=0;i<n;i++) {
if (mask[i]) {
mask[i] = 0;
fail[i] = 1;
}
else {
fail[i] = 0;
}
}
allfail = GL_TRUE;
break;
case GL_LESS:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r < s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_LEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r <= s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_GREATER:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r > s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_GEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r >= s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_EQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r == s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_NOTEQUAL:
r = (GLstencil) (ctx->Stencil.Ref[face] & valueMask);
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS(x[i],y[i]);
s = (GLstencil) (*sptr & valueMask);
if (r != s) {
fail[i] = 0;
}
else {
fail[i] = 1;
mask[i] = 0;
}
}
else {
fail[i] = 0;
}
}
break;
case GL_ALWAYS:
for (i=0;i<n;i++) {
fail[i] = 0;
}
break;
default:
_mesa_problem(ctx, "Bad stencil func in gl_stencil_pixels");
return 0;
}
if (ctx->Stencil.FailFunc[face] != GL_KEEP) {
apply_stencil_op_to_pixels( ctx, n, x, y, ctx->Stencil.FailFunc[face],
face, fail );
}
return !allfail;
}
static GLboolean
stencil_and_ztest_pixels( GLcontext *ctx, struct sw_span *span, GLuint face )
{
const GLuint n = span->end;
const GLint *x = span->array->x;
const GLint *y = span->array->y;
GLubyte *mask = span->array->mask;
SWcontext *swrast = SWRAST_CONTEXT(ctx);
ASSERT(span->arrayMask & SPAN_XY);
ASSERT(ctx->Stencil.Enabled);
ASSERT(n <= MAX_WIDTH);
if (swrast->Driver.WriteStencilPixels) {
GLstencil stencil[MAX_WIDTH];
GLubyte origMask[MAX_WIDTH];
ASSERT(!ctx->DrawBuffer->UseSoftwareStencilBuffer);
ASSERT(swrast->Driver.ReadStencilPixels);
(*swrast->Driver.ReadStencilPixels)(ctx, n, x, y, stencil);
MEMCPY(origMask, mask, n * sizeof(GLubyte));
(void) do_stencil_test(ctx, face, n, stencil, mask);
if (ctx->Depth.Test == GL_FALSE) {
apply_stencil_op(ctx, ctx->Stencil.ZPassFunc[face], face,
n, stencil, mask);
}
else {
_mesa_depth_test_span(ctx, span);
if (ctx->Stencil.ZFailFunc[face] != GL_KEEP) {
GLubyte failmask[MAX_WIDTH];
GLuint i;
for (i = 0; i < n; i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
failmask[i] = origMask[i] & (mask[i] ^ 1);
}
apply_stencil_op(ctx, ctx->Stencil.ZFailFunc[face], face,
n, stencil, failmask);
}
if (ctx->Stencil.ZPassFunc[face] != GL_KEEP) {
GLubyte passmask[MAX_WIDTH];
GLuint i;
for (i = 0; i < n; i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
passmask[i] = origMask[i] & mask[i];
}
apply_stencil_op(ctx, ctx->Stencil.ZPassFunc[face], face,
n, stencil, passmask);
}
}
(swrast->Driver.WriteStencilPixels)(ctx, n, x, y, stencil, origMask);
return GL_TRUE;
}
else {
ASSERT(ctx->DrawBuffer->UseSoftwareStencilBuffer);
if (stencil_test_pixels(ctx, face, n, x, y, mask) == GL_FALSE) {
return GL_FALSE;
}
if (ctx->Depth.Test==GL_FALSE) {
apply_stencil_op_to_pixels(ctx, n, x, y,
ctx->Stencil.ZPassFunc[face], face, mask);
}
else {
GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
GLuint i;
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
_mesa_depth_test_span(ctx, span);
for (i=0;i<n;i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
passmask[i] = oldmask[i] & mask[i];
failmask[i] = oldmask[i] & (mask[i] ^ 1);
}
if (ctx->Stencil.ZFailFunc[face] != GL_KEEP) {
apply_stencil_op_to_pixels(ctx, n, x, y,
ctx->Stencil.ZFailFunc[face],
face, failmask);
}
if (ctx->Stencil.ZPassFunc[face] != GL_KEEP) {
apply_stencil_op_to_pixels(ctx, n, x, y,
ctx->Stencil.ZPassFunc[face],
face, passmask);
}
}
return GL_TRUE;
}
}
GLboolean
_mesa_stencil_and_ztest_span(GLcontext *ctx, struct sw_span *span)
{
ASSERT(ctx->Stencil.TestTwoSide || span->facing == 0);
if (span->arrayMask & SPAN_XY)
return stencil_and_ztest_pixels(ctx, span, span->facing);
else
return stencil_and_ztest_span(ctx, span, span->facing);
}
void
_mesa_read_stencil_span( GLcontext *ctx,
GLint n, GLint x, GLint y, GLstencil stencil[] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLint bufWidth = (GLint) ctx->DrawBuffer->Width;
const GLint bufHeight = (GLint) ctx->DrawBuffer->Height;
if (y < 0 || y >= bufHeight || x + n <= 0 || x >= bufWidth) {
return;
}
if (x < 0) {
GLint dx = -x;
x = 0;
n -= dx;
stencil += dx;
}
if (x + n > bufWidth) {
GLint dx = x + n - bufWidth;
n -= dx;
}
if (n <= 0) {
return;
}
ASSERT(n >= 0);
if (swrast->Driver.ReadStencilSpan) {
(*swrast->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
}
else if (ctx->DrawBuffer->Stencil) {
const GLstencil *s = STENCIL_ADDRESS( x, y );
#if STENCIL_BITS == 8
MEMCPY( stencil, s, n * sizeof(GLstencil) );
#else
GLuint i;
for (i=0;i<n;i++)
stencil[i] = s[i];
#endif
}
}
void
_mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
const GLstencil stencil[] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLstencil *ssrc = stencil;
const GLint bufWidth = (GLint) ctx->DrawBuffer->Width;
const GLint bufHeight = (GLint) ctx->DrawBuffer->Height;
if (y < 0 || y >= bufHeight || x + n <= 0 || x >= bufWidth) {
return;
}
if (x < 0) {
GLint dx = -x;
x = 0;
n -= dx;
ssrc += dx;
}
if (x + n > bufWidth) {
GLint dx = x + n - bufWidth;
n -= dx;
}
if (n <= 0) {
return;
}
if (swrast->Driver.WriteStencilSpan) {
(*swrast->Driver.WriteStencilSpan)( ctx, n, x, y, ssrc, NULL );
}
else if (ctx->DrawBuffer->Stencil) {
GLstencil *s = STENCIL_ADDRESS( x, y );
#if STENCIL_BITS == 8
MEMCPY( s, ssrc, n * sizeof(GLstencil) );
#else
GLuint i;
for (i=0;i<n;i++)
s[i] = ssrc[i];
#endif
}
}
void
_mesa_alloc_stencil_buffer( GLframebuffer *buffer )
{
if (buffer->Stencil) {
MESA_PBUFFER_FREE(buffer->Stencil);
buffer->Stencil = NULL;
}
buffer->Stencil = (GLstencil *)
MESA_PBUFFER_ALLOC(buffer->Width * buffer->Height * sizeof(GLstencil));
if (!buffer->Stencil) {
_mesa_error( NULL, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" );
}
}
static void
clear_software_stencil_buffer( GLcontext *ctx )
{
if (ctx->Visual.stencilBits==0 || !ctx->DrawBuffer->Stencil) {
return;
}
if (ctx->Scissor.Enabled) {
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
GLint y;
for (y = ctx->DrawBuffer->_Ymin; y < ctx->DrawBuffer->_Ymax; y++) {
const GLstencil mask = ctx->Stencil.WriteMask[0];
const GLstencil invMask = ~mask;
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->_Xmin, y );
GLint i;
for (i = 0; i < width; i++) {
stencil[i] = (stencil[i] & invMask) | clearVal;
}
}
}
else {
GLint y;
for (y = ctx->DrawBuffer->_Ymin; y < ctx->DrawBuffer->_Ymax; y++) {
GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->_Xmin, y );
#if STENCIL_BITS==8
MEMSET( stencil, ctx->Stencil.Clear, width * sizeof(GLstencil) );
#else
GLint i;
for (i = 0; i < width; i++)
stencil[x] = ctx->Stencil.Clear;
#endif
}
}
}
else {
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
GLstencil *stencil = ctx->DrawBuffer->Stencil;
const GLstencil mask = ctx->Stencil.WriteMask[0];
const GLstencil invMask = ~mask;
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
GLuint i;
for (i = 0; i < n; i++) {
stencil[i] = (stencil[i] & invMask) | clearVal;
}
}
else {
const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
GLstencil *stencil = ctx->DrawBuffer->Stencil;
#if STENCIL_BITS==8
MEMSET(stencil, ctx->Stencil.Clear, n * sizeof(GLstencil) );
#else
GLuint i;
for (i = 0; i < n; i++) {
stencil[i] = ctx->Stencil.Clear;
}
#endif
}
}
}
static void
clear_hardware_stencil_buffer( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
ASSERT(swrast->Driver.WriteStencilSpan);
ASSERT(swrast->Driver.ReadStencilSpan);
if (ctx->Scissor.Enabled) {
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
GLint y;
for (y = ctx->DrawBuffer->_Ymin; y < ctx->DrawBuffer->_Ymax; y++) {
const GLstencil mask = ctx->Stencil.WriteMask[0];
const GLstencil invMask = ~mask;
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
GLstencil stencil[MAX_WIDTH];
GLint i;
(*swrast->Driver.ReadStencilSpan)(ctx, width, x, y, stencil);
for (i = 0; i < width; i++) {
stencil[i] = (stencil[i] & invMask) | clearVal;
}
(*swrast->Driver.WriteStencilSpan)(ctx, width, x, y, stencil, NULL);
}
}
else {
GLstencil stencil[MAX_WIDTH];
GLint y, i;
for (i = 0; i < width; i++) {
stencil[i] = ctx->Stencil.Clear;
}
for (y = ctx->DrawBuffer->_Ymin; y < ctx->DrawBuffer->_Ymax; y++) {
(*swrast->Driver.WriteStencilSpan)(ctx, width, x, y, stencil, NULL);
}
}
}
else {
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
const GLstencil mask = ctx->Stencil.WriteMask[0];
const GLstencil invMask = ~mask;
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
const GLint width = ctx->DrawBuffer->Width;
const GLint height = ctx->DrawBuffer->Height;
const GLint x = ctx->DrawBuffer->_Xmin;
GLint y;
for (y = 0; y < height; y++) {
GLstencil stencil[MAX_WIDTH];
GLint i;
(*swrast->Driver.ReadStencilSpan)(ctx, width, x, y, stencil);
for (i = 0; i < width; i++) {
stencil[i] = (stencil[i] & invMask) | clearVal;
}
(*swrast->Driver.WriteStencilSpan)(ctx, width, x, y, stencil, NULL);
}
}
else {
const GLint width = ctx->DrawBuffer->Width;
const GLint height = ctx->DrawBuffer->Height;
const GLint x = ctx->DrawBuffer->_Xmin;
GLstencil stencil[MAX_WIDTH];
GLint y, i;
for (i = 0; i < width; i++) {
stencil[i] = ctx->Stencil.Clear;
}
for (y = 0; y < height; y++) {
(*swrast->Driver.WriteStencilSpan)(ctx, width, x, y, stencil, NULL);
}
}
}
}
void
_mesa_clear_stencil_buffer( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (swrast->Driver.WriteStencilSpan) {
ASSERT(swrast->Driver.ReadStencilSpan);
clear_hardware_stencil_buffer(ctx);
}
else {
clear_software_stencil_buffer(ctx);
}
}