mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2026-05-05 13:58:04 +02:00
Clearing stencil buffer now observes the stencil write mask
Optimized gl_depth_stencil_span/pixels() functions
This commit is contained in:
Brian Paul
parent
c63a8693bb
commit
a1216fe3a2
1 changed files with 104 additions and 79 deletions
|
|
@ -1,4 +1,4 @@
|
|||
/* $Id: stencil.c,v 1.10 1999/11/24 18:48:31 brianp Exp $ */
|
||||
/* $Id: stencil.c,v 1.11 1999/12/04 21:23:55 brianp Exp $ */
|
||||
|
||||
/*
|
||||
* Mesa 3-D graphics library
|
||||
|
|
@ -38,14 +38,6 @@
|
|||
#endif
|
||||
|
||||
|
||||
#if STENCIL_BITS==8
|
||||
# define STENCIL_MAX 0xff
|
||||
#elif STENCIL_BITS==16
|
||||
# define STENCIL_MAX 0xffff
|
||||
#else
|
||||
illegal number of stencil bits
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
void
|
||||
|
|
@ -172,25 +164,21 @@ _mesa_StencilOp( GLenum fail, GLenum zfail, GLenum zpass )
|
|||
/* Stencil Logic:
|
||||
|
||||
IF stencil test fails THEN
|
||||
Apply fail-op to stencil value
|
||||
Don't write the pixel (RGBA,Z)
|
||||
Execute FailOp
|
||||
ELSE
|
||||
Write the pixel
|
||||
ENDIF
|
||||
|
||||
Perform Depth Test
|
||||
|
||||
IF depth test passes OR no depth buffer THEN
|
||||
Execute ZPass
|
||||
Write the pixel
|
||||
ELSE
|
||||
Execute ZFail
|
||||
IF doing depth test && depth test fails THEN
|
||||
Apply zfail-op to stencil value
|
||||
Write RGBA and Z to appropriate buffers
|
||||
ELSE
|
||||
Apply zpass-op to stencil value
|
||||
ENDIF
|
||||
|
||||
*/
|
||||
|
||||
|
||||
|
||||
|
||||
/*
|
||||
* Return the address of a stencil buffer value given the window coords:
|
||||
*/
|
||||
|
|
@ -200,21 +188,19 @@ ENDIF
|
|||
|
||||
|
||||
/*
|
||||
* Apply the given stencil operator for each pixel in the span whose
|
||||
* mask flag is set.
|
||||
* Apply the given stencil operator to the array of stencil values.
|
||||
* Don't touch stencil[i] if mask[i] is zero.
|
||||
* Input: n - number of pixels in the span
|
||||
* x, y - location of leftmost pixel in the span
|
||||
* oper - the stencil buffer operator
|
||||
* stencil - array of stencil values
|
||||
* mask - array [n] of flag: 1=apply operator, 0=don't apply operator
|
||||
*/
|
||||
static void apply_stencil_op_to_span( GLcontext *ctx,
|
||||
GLuint n, GLint x, GLint y,
|
||||
GLenum oper, GLubyte mask[] )
|
||||
static void apply_stencil_op( GLcontext *ctx, GLenum oper,
|
||||
GLuint n, GLstencil stencil[], GLubyte mask[] )
|
||||
{
|
||||
const GLstencil ref = ctx->Stencil.Ref;
|
||||
const GLstencil wrtmask = ctx->Stencil.WriteMask;
|
||||
const GLstencil invmask = (GLstencil) (~ctx->Stencil.WriteMask);
|
||||
GLstencil *stencil = STENCIL_ADDRESS( x, y );
|
||||
GLuint i;
|
||||
|
||||
switch (oper) {
|
||||
|
|
@ -353,7 +339,7 @@ static void apply_stencil_op_to_span( GLcontext *ctx,
|
|||
}
|
||||
break;
|
||||
default:
|
||||
gl_problem(ctx, "Bad stencilop in apply_stencil_op_to_span");
|
||||
gl_problem(ctx, "Bad stencil op in apply_stencil_op");
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -528,7 +514,9 @@ GLint gl_stencil_span( GLcontext *ctx,
|
|||
return 0;
|
||||
}
|
||||
|
||||
apply_stencil_op_to_span( ctx, n, x, y, ctx->Stencil.FailFunc, fail );
|
||||
if (ctx->Stencil.FailFunc != GL_KEEP) {
|
||||
apply_stencil_op( ctx, ctx->Stencil.FailFunc, n, stencil, fail );
|
||||
}
|
||||
|
||||
return (allfail) ? 0 : 1;
|
||||
}
|
||||
|
|
@ -548,11 +536,13 @@ void gl_depth_stencil_span( GLcontext *ctx,
|
|||
GLuint n, GLint x, GLint y, const GLdepth z[],
|
||||
GLubyte mask[] )
|
||||
{
|
||||
GLstencil *stencil = STENCIL_ADDRESS(x, y);
|
||||
|
||||
if (ctx->Depth.Test==GL_FALSE) {
|
||||
/*
|
||||
* No depth buffer, just apply zpass stencil function to active pixels.
|
||||
*/
|
||||
apply_stencil_op_to_span( ctx, n, x, y, ctx->Stencil.ZPassFunc, mask );
|
||||
apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, mask );
|
||||
}
|
||||
else {
|
||||
/*
|
||||
|
|
@ -561,31 +551,36 @@ void gl_depth_stencil_span( GLcontext *ctx,
|
|||
GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
|
||||
GLuint i;
|
||||
|
||||
/* init pass and fail masks to zero, copy mask[] to oldmask[] */
|
||||
for (i=0;i<n;i++) {
|
||||
passmask[i] = failmask[i] = 0;
|
||||
oldmask[i] = mask[i];
|
||||
}
|
||||
/* save the current mask bits */
|
||||
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
|
||||
|
||||
/* apply the depth test */
|
||||
if (ctx->Driver.DepthTestSpan)
|
||||
(*ctx->Driver.DepthTestSpan)( ctx, n, x, y, z, mask );
|
||||
|
||||
/* set the stencil pass/fail flags according to result of depth test */
|
||||
/* Set the stencil pass/fail flags according to result of depth testing.
|
||||
* if oldmask[i] == 0 then
|
||||
* Don't touch the stencil value
|
||||
* else if oldmask[i] and newmask[i] then
|
||||
* Depth test passed
|
||||
* else
|
||||
* assert(oldmask[i] && !newmask[i])
|
||||
* Depth test failed
|
||||
* endif
|
||||
*/
|
||||
for (i=0;i<n;i++) {
|
||||
if (oldmask[i]) {
|
||||
if (mask[i]) {
|
||||
passmask[i] = 1;
|
||||
}
|
||||
else {
|
||||
failmask[i] = 1;
|
||||
}
|
||||
}
|
||||
ASSERT(mask[i] == 0 || mask[i] == 1);
|
||||
passmask[i] = oldmask[i] & mask[i];
|
||||
failmask[i] = oldmask[i] & (mask[i] ^ 1);
|
||||
}
|
||||
|
||||
/* apply the pass and fail operations */
|
||||
apply_stencil_op_to_span( ctx, n, x, y, ctx->Stencil.ZFailFunc, failmask );
|
||||
apply_stencil_op_to_span( ctx, n, x, y, ctx->Stencil.ZPassFunc, passmask );
|
||||
if (ctx->Stencil.ZFailFunc != GL_KEEP) {
|
||||
apply_stencil_op( ctx, ctx->Stencil.ZFailFunc, n, stencil, failmask );
|
||||
}
|
||||
if (ctx->Stencil.ZPassFunc != GL_KEEP) {
|
||||
apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, passmask );
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -965,26 +960,27 @@ void gl_depth_stencil_pixels( GLcontext *ctx,
|
|||
GLubyte passmask[PB_SIZE], failmask[PB_SIZE], oldmask[PB_SIZE];
|
||||
GLuint i;
|
||||
|
||||
/* init pass and fail masks to zero */
|
||||
for (i=0;i<n;i++) {
|
||||
passmask[i] = failmask[i] = 0;
|
||||
oldmask[i] = mask[i];
|
||||
}
|
||||
/* save the current mask bits */
|
||||
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
|
||||
|
||||
/* apply the depth test */
|
||||
if (ctx->Driver.DepthTestPixels)
|
||||
(*ctx->Driver.DepthTestPixels)( ctx, n, x, y, z, mask );
|
||||
|
||||
/* set the stencil pass/fail flags according to result of depth test */
|
||||
/* Set the stencil pass/fail flags according to result of depth testing.
|
||||
* if oldmask[i] == 0 then
|
||||
* Don't touch the stencil value
|
||||
* else if oldmask[i] and newmask[i] then
|
||||
* Depth test passed
|
||||
* else
|
||||
* assert(oldmask[i] && !newmask[i])
|
||||
* Depth test failed
|
||||
* endif
|
||||
*/
|
||||
for (i=0;i<n;i++) {
|
||||
if (oldmask[i]) {
|
||||
if (mask[i]) {
|
||||
passmask[i] = 1;
|
||||
}
|
||||
else {
|
||||
failmask[i] = 1;
|
||||
}
|
||||
}
|
||||
ASSERT(mask[i] == 0 || mask[i] == 1);
|
||||
passmask[i] = oldmask[i] & mask[i];
|
||||
failmask[i] = oldmask[i] & (mask[i] ^ 1);
|
||||
}
|
||||
|
||||
/* apply the pass and fail operations */
|
||||
|
|
@ -1071,10 +1067,6 @@ void gl_alloc_stencil_buffer( GLcontext *ctx )
|
|||
|
||||
|
||||
|
||||
/*
|
||||
* Clear the stencil buffer. If the stencil buffer doesn't exist yet we'll
|
||||
* allocate it now.
|
||||
*/
|
||||
void gl_clear_stencil_buffer( GLcontext *ctx )
|
||||
{
|
||||
if (ctx->Visual->StencilBits==0 || !ctx->DrawBuffer->Stencil) {
|
||||
|
|
@ -1084,30 +1076,63 @@ void gl_clear_stencil_buffer( GLcontext *ctx )
|
|||
|
||||
if (ctx->Scissor.Enabled) {
|
||||
/* clear scissor region only */
|
||||
GLint y;
|
||||
GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin + 1;
|
||||
for (y=ctx->DrawBuffer->Ymin; y<=ctx->DrawBuffer->Ymax; y++) {
|
||||
GLstencil *ptr = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y );
|
||||
const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin + 1;
|
||||
if (ctx->Stencil.WriteMask != STENCIL_MAX) {
|
||||
/* must apply mask to the clear */
|
||||
GLint y;
|
||||
for (y=ctx->DrawBuffer->Ymin; y<=ctx->DrawBuffer->Ymax; y++) {
|
||||
GLstencil *ptr = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y );
|
||||
GLint x;
|
||||
const GLstencil mask = ctx->Stencil.WriteMask;
|
||||
const GLstencil invMask = ~mask;
|
||||
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
|
||||
for (x = 0; x < width; x++) {
|
||||
ptr[x] = (ptr[x] & invMask) | clearVal;
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
/* no masking */
|
||||
GLint y;
|
||||
for (y=ctx->DrawBuffer->Ymin; y<=ctx->DrawBuffer->Ymax; y++) {
|
||||
GLstencil *ptr = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y );
|
||||
#if STENCIL_BITS==8
|
||||
MEMSET( ptr, ctx->Stencil.Clear, width * sizeof(GLstencil) );
|
||||
MEMSET( ptr, ctx->Stencil.Clear, width * sizeof(GLstencil) );
|
||||
#else
|
||||
GLint x;
|
||||
for (x = 0; x < width; x++)
|
||||
ptr[x] = ctx->Stencil.Clear;
|
||||
GLint x;
|
||||
for (x = 0; x < width; x++)
|
||||
ptr[x] = ctx->Stencil.Clear;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
/* clear whole stencil buffer */
|
||||
if (ctx->Stencil.WriteMask != STENCIL_MAX) {
|
||||
/* must apply mask to the clear */
|
||||
const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
|
||||
GLstencil *buffer = ctx->DrawBuffer->Stencil;
|
||||
const GLstencil mask = ctx->Stencil.WriteMask;
|
||||
const GLstencil invMask = ~mask;
|
||||
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
|
||||
GLuint i;
|
||||
for (i = 0; i < n; i++) {
|
||||
buffer[i] = (buffer[i] & invMask) | clearVal;
|
||||
}
|
||||
}
|
||||
else {
|
||||
/* clear whole buffer without masking */
|
||||
const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
|
||||
GLstencil *buffer = ctx->DrawBuffer->Stencil;
|
||||
|
||||
#if STENCIL_BITS==8
|
||||
MEMSET( ctx->DrawBuffer->Stencil, ctx->Stencil.Clear,
|
||||
ctx->DrawBuffer->Width * ctx->DrawBuffer->Height * sizeof(GLstencil) );
|
||||
MEMSET(buffer, ctx->Stencil.Clear, n * sizeof(GLstencil) );
|
||||
#else
|
||||
GLuint i;
|
||||
GLuint pixels = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
|
||||
GLstencil *buffer = ctx->DrawBuffer->Stencil;
|
||||
for (i = 0; i < pixels; i++)
|
||||
ptr[i] = ctx->Stencil.Clear;
|
||||
GLuint i;
|
||||
for (i = 0; i < n; i++) {
|
||||
buffer[i] = ctx->Stencil.Clear;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue