#include "glheader.h"
#include "context.h"
#include "imports.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_stencil.h"
#include "s_span.h"
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);
const GLstencil stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1;
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 < stencilMax) {
stencil[i] = (GLstencil) (s+1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil s = stencil[i];
if (s < stencilMax) {
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, SWspan *span, GLuint face)
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
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
stencil = (GLstencil *) rb->GetPointer(ctx, rb, x, y);
if (!stencil) {
rb->GetRow(ctx, rb, n, x, y, stencilRow);
stencil = stencilRow;
}
if (do_stencil_test( ctx, face, n, stencil, mask ) == GL_FALSE) {
span->writeAll = GL_FALSE;
if (!rb->GetPointer(ctx, rb, 0, 0)) {
rb->PutRow(ctx, rb, n, x, y, stencil, NULL);
}
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;
_mesa_memcpy(oldmask, mask, n * sizeof(GLubyte));
_swrast_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 (!rb->GetPointer(ctx, rb, 0, 0)) {
rb->PutRow(ctx, rb, n, x, y, stencil, NULL);
}
span->writeAll = GL_FALSE;
return GL_TRUE;
}
#define STENCIL_ADDRESS(X, Y) (stencilStart + (Y) * stride + (X))
static void
apply_stencil_op_to_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLenum oper, GLuint face, const GLubyte mask[] )
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
const GLstencil stencilMax = (1 << fb->Visual.stencilBits) - 1;
const GLstencil ref = ctx->Stencil.Ref[face];
const GLstencil wrtmask = ctx->Stencil.WriteMask[face];
const GLstencil invmask = (GLstencil) (~wrtmask);
GLuint i;
GLstencil *stencilStart = (GLubyte *) rb->Data;
const GLuint stride = rb->Width;
ASSERT(rb->GetPointer(ctx, rb, 0, 0));
ASSERT(sizeof(GLstencil) == 1);
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 < stencilMax) {
*sptr = (GLstencil) (*sptr + 1);
}
}
}
}
else {
for (i=0;i<n;i++) {
if (mask[i]) {
GLstencil *sptr = STENCIL_ADDRESS( x[i], y[i] );
if (*sptr < stencilMax) {
*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[] )
{
const struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
GLubyte fail[MAX_WIDTH];
GLstencil r, s;
GLuint i;
GLboolean allfail = GL_FALSE;
const GLuint valueMask = ctx->Stencil.ValueMask[face];
const GLstencil *stencilStart = (GLstencil *) rb->Data;
const GLuint stride = rb->Width;
ASSERT(rb->GetPointer(ctx, rb, 0, 0));
ASSERT(sizeof(GLstencil) == 1);
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]) {
const 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]) {
const 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]) {
const 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]) {
const 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]) {
const 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]) {
const 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, SWspan *span, GLuint face )
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
const GLuint n = span->end;
const GLint *x = span->array->x;
const GLint *y = span->array->y;
GLubyte *mask = span->array->mask;
ASSERT(span->arrayMask & SPAN_XY);
ASSERT(ctx->Stencil.Enabled);
ASSERT(n <= MAX_WIDTH);
if (!rb->GetPointer(ctx, rb, 0, 0)) {
GLstencil stencil[MAX_WIDTH];
GLubyte origMask[MAX_WIDTH];
ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
_swrast_get_values(ctx, rb, n, x, y, stencil, sizeof(GLubyte));
_mesa_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 {
_swrast_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);
}
}
rb->PutValues(ctx, rb, n, x, y, stencil, origMask);
return GL_TRUE;
}
else {
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;
_mesa_memcpy(oldmask, mask, n * sizeof(GLubyte));
_swrast_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
_swrast_stencil_and_ztest_span(GLcontext *ctx, SWspan *span)
{
if (span->arrayMask & SPAN_XY)
return stencil_and_ztest_pixels(ctx, span, span->facing);
else
return stencil_and_ztest_span(ctx, span, span->facing);
}
#if 0
GLuint
clip_span(GLuint bufferWidth, GLuint bufferHeight,
GLint x, GLint y, GLuint *count)
{
GLuint n = *count;
GLuint skipPixels = 0;
if (y < 0 || y >= bufferHeight || x + n <= 0 || x >= bufferWidth) {
n = 0;
}
else {
if (x < 0) {
skipPixels = -x;
x = 0;
n -= skipPixels;
}
if (x + n > bufferWidth) {
GLint dx = x + n - bufferWidth;
n -= dx;
}
}
*count = n;
return skipPixels;
}
#endif
void
_swrast_read_stencil_span(GLcontext *ctx, struct gl_renderbuffer *rb,
GLint n, GLint x, GLint y, GLstencil stencil[])
{
if (y < 0 || y >= (GLint) rb->Height ||
x + n <= 0 || x >= (GLint) rb->Width) {
return;
}
if (x < 0) {
GLint dx = -x;
x = 0;
n -= dx;
stencil += dx;
}
if (x + n > (GLint) rb->Width) {
GLint dx = x + n - rb->Width;
n -= dx;
}
if (n <= 0) {
return;
}
rb->GetRow(ctx, rb, n, x, y, stencil);
}
void
_swrast_write_stencil_span(GLcontext *ctx, GLint n, GLint x, GLint y,
const GLstencil stencil[] )
{
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
const GLuint stencilMax = (1 << fb->Visual.stencilBits) - 1;
const GLuint stencilMask = ctx->Stencil.WriteMask[0];
if (y < 0 || y >= (GLint) rb->Height ||
x + n <= 0 || x >= (GLint) rb->Width) {
return;
}
if (x < 0) {
GLint dx = -x;
x = 0;
n -= dx;
stencil += dx;
}
if (x + n > (GLint) rb->Width) {
GLint dx = x + n - rb->Width;
n -= dx;
}
if (n <= 0) {
return;
}
if ((stencilMask & stencilMax) != stencilMax) {
GLstencil destVals[MAX_WIDTH], newVals[MAX_WIDTH];
GLint i;
rb->GetRow(ctx, rb, n, x, y, destVals);
for (i = 0; i < n; i++) {
newVals[i]
= (stencil[i] & stencilMask) | (destVals[i] & ~stencilMask);
}
rb->PutRow(ctx, rb, n, x, y, newVals, NULL);
}
else {
rb->PutRow(ctx, rb, n, x, y, stencil, NULL);
}
}
void
_swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
{
const GLubyte stencilBits = ctx->DrawBuffer->Visual.stencilBits;
const GLuint mask = ctx->Stencil.WriteMask[0];
const GLuint invMask = ~mask;
const GLuint clearVal = (ctx->Stencil.Clear & mask);
const GLuint stencilMax = (1 << stencilBits) - 1;
GLint x, y, width, height;
if (!rb || mask == 0)
return;
ASSERT(rb->DataType == GL_UNSIGNED_BYTE ||
rb->DataType == GL_UNSIGNED_SHORT);
ASSERT(rb->_BaseFormat == GL_STENCIL_INDEX);
x = ctx->DrawBuffer->_Xmin;
y = ctx->DrawBuffer->_Ymin;
width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
if (rb->GetPointer(ctx, rb, 0, 0)) {
if ((mask & stencilMax) != stencilMax) {
if (rb->DataType == GL_UNSIGNED_BYTE) {
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte *stencil = (GLubyte*) rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
}
}
else {
GLint i, j;
for (i = 0; i < height; i++) {
GLushort *stencil = (GLushort*) rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
}
}
}
else {
if (width == (GLint) rb->Width && rb->DataType == GL_UNSIGNED_BYTE) {
GLubyte *stencil = (GLubyte *) rb->GetPointer(ctx, rb, x, y);
GLuint len = width * height * sizeof(GLubyte);
_mesa_memset(stencil, clearVal, len);
}
else {
GLint i;
for (i = 0; i < height; i++) {
GLvoid *stencil = rb->GetPointer(ctx, rb, x, y + i);
if (rb->DataType == GL_UNSIGNED_BYTE) {
_mesa_memset(stencil, clearVal, width);
}
else {
_mesa_memset16((short unsigned int*) stencil, clearVal, width);
}
}
}
}
}
else {
if ((mask & stencilMax) != stencilMax) {
if (rb->DataType == GL_UNSIGNED_BYTE) {
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte stencil[MAX_WIDTH];
rb->GetRow(ctx, rb, width, x, y + i, stencil);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
rb->PutRow(ctx, rb, width, x, y + i, stencil, NULL);
}
}
else {
GLint i, j;
for (i = 0; i < height; i++) {
GLushort stencil[MAX_WIDTH];
rb->GetRow(ctx, rb, width, x, y + i, stencil);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
rb->PutRow(ctx, rb, width, x, y + i, stencil, NULL);
}
}
}
else {
const GLubyte clear8 = (GLubyte) clearVal;
const GLushort clear16 = (GLushort) clearVal;
const void *clear;
GLint i;
if (rb->DataType == GL_UNSIGNED_BYTE) {
clear = &clear8;
}
else {
clear = &clear16;
}
for (i = 0; i < height; i++) {
rb->PutMonoRow(ctx, rb, width, x, y + i, clear, NULL);
}
}
}
}