aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c
diff options
context:
space:
mode:
Diffstat (limited to 'nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c')
-rw-r--r--nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c1221
1 files changed, 0 insertions, 1221 deletions
diff --git a/nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c b/nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c
deleted file mode 100644
index 98638b244..000000000
--- a/nx-X11/extras/Mesa/src/mesa/swrast/s_stencil.c
+++ /dev/null
@@ -1,1221 +0,0 @@
-/*
- * Mesa 3-D graphics library
- * Version: 6.4.1
- *
- * Copyright (C) 1999-2005 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"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#include "glheader.h"
-#include "context.h"
-#include "macros.h"
-#include "imports.h"
-#include "fbobject.h"
-
-#include "s_context.h"
-#include "s_depth.h"
-#include "s_stencil.h"
-#include "s_span.h"
-
-
-
-/* Stencil Logic:
-
-IF stencil test fails THEN
- Apply fail-op to stencil value
- Don't write the pixel (RGBA,Z)
-ELSE
- 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
-
-*/
-
-
-/**
- * Apply the given stencil operator to the array of stencil values.
- * Don't touch stencil[i] if mask[i] is zero.
- * Input: n - size of stencil array
- * oper - the stencil buffer operator
- * face - 0 or 1 for front or back face operation
- * stencil - array of stencil values
- * mask - array [n] of flag: 1=apply operator, 0=don't apply operator
- * Output: stencil - modified values
- */
-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:
- /* do nothing */
- 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]) {
- /* VERIFY logic of adding 1 to a write-masked value */
- 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]) {
- /* VERIFY logic of subtracting 1 to a write-masked value */
- 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");
- }
-}
-
-
-
-
-/**
- * Apply stencil test to an array of stencil values (before depth buffering).
- * Input: face - 0 or 1 for front or back-face polygons
- * n - number of pixels in the array
- * stencil - array of [n] stencil values
- * mask - array [n] of flag: 0=skip the pixel, 1=stencil the pixel
- * Output: mask - pixels which fail the stencil test will have their
- * mask flag set to 0.
- * stencil - updated stencil values (where the test passed)
- * Return: GL_FALSE = all pixels failed, GL_TRUE = zero or more pixels passed.
- */
-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);
-
- /*
- * Perform stencil test. The results of this operation are stored
- * in the fail[] array:
- * IF fail[i] is non-zero THEN
- * the stencil fail operator is to be applied
- * ELSE
- * the stencil fail operator is not to be applied
- * ENDIF
- */
- switch (ctx->Stencil.Function[face]) {
- case GL_NEVER:
- /* never pass; always fail */
- 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) {
- /* passed */
- 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) {
- /* pass */
- 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) {
- /* passed */
- 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) {
- /* passed */
- 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) {
- /* passed */
- 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) {
- /* passed */
- fail[i] = 0;
- }
- else {
- fail[i] = 1;
- mask[i] = 0;
- }
- }
- else {
- fail[i] = 0;
- }
- }
- break;
- case GL_ALWAYS:
- /* always pass */
- 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;
-}
-
-
-
-/**
- * Apply stencil and depth testing to the span of pixels.
- * Both software and hardware stencil buffers are acceptable.
- * Input: n - number of pixels in the span
- * x, y - location of leftmost pixel in span
- * z - array [n] of z values
- * mask - array [n] of flags (1=test this pixel, 0=skip the pixel)
- * Output: mask - array [n] of flags (1=stencil and depth test passed)
- * Return: GL_FALSE - all fragments failed the testing
- * GL_TRUE - one or more fragments passed the testing
- *
- */
-static GLboolean
-stencil_and_ztest_span(GLcontext *ctx, struct sw_span *span, GLuint face)
-{
- struct gl_framebuffer *fb = ctx->DrawBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- 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 = rb->GetPointer(ctx, rb, x, y);
- if (!stencil) {
- rb->GetRow(ctx, rb, n, x, y, stencilRow);
- stencil = stencilRow;
- }
-
- /*
- * Apply the stencil test to the fragments.
- * failMask[i] is 1 if the stencil test failed.
- */
- if (do_stencil_test( ctx, face, n, stencil, mask ) == GL_FALSE) {
- /* all fragments failed the stencil test, we're done. */
- span->writeAll = GL_FALSE;
- if (!rb->GetPointer(ctx, rb, 0, 0)) {
- /* put updated stencil values into buffer */
- rb->PutRow(ctx, rb, n, x, y, stencil, NULL);
- }
- return GL_FALSE;
- }
-
- /*
- * Some fragments passed the stencil test, apply depth test to them
- * and apply Zpass and Zfail stencil ops.
- */
- if (ctx->Depth.Test == GL_FALSE) {
- /*
- * No depth buffer, just apply zpass stencil function to active pixels.
- */
- apply_stencil_op( ctx, ctx->Stencil.ZPassFunc[face], face, n, stencil, mask );
- }
- else {
- /*
- * Perform depth buffering, then apply zpass or zfail stencil function.
- */
- GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
- GLuint i;
-
- /* save the current mask bits */
- _mesa_memcpy(oldmask, mask, n * sizeof(GLubyte));
-
- /* apply the depth test */
- _swrast_depth_test_span(ctx, span);
-
- /* 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++) {
- 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 */
- 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 );
- }
- }
-
- /*
- * Write updated stencil values back into hardware stencil buffer.
- */
- if (!rb->GetPointer(ctx, rb, 0, 0)) {
- rb->PutRow(ctx, rb, n, x, y, stencil, NULL);
- }
-
- span->writeAll = GL_FALSE;
-
- return GL_TRUE; /* one or more fragments passed both tests */
-}
-
-
-
-/*
- * Return the address of a stencil buffer value given the window coords:
- */
-#define STENCIL_ADDRESS(X, Y) (stencilStart + (Y) * stride + (X))
-
-
-
-/**
- * Apply the given stencil operator for each pixel in the array whose
- * mask flag is set.
- * \note This is for software stencil buffers only.
- * Input: n - number of pixels in the span
- * x, y - array of [n] pixels
- * operator - the stencil buffer operator
- * mask - array [n] of flag: 1=apply operator, 0=don't apply operator
- */
-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->Attachment[BUFFER_STENCIL].Renderbuffer;
- 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:
- /* do nothing */
- 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");
- }
-}
-
-
-
-/**
- * Apply stencil test to an array of pixels before depth buffering.
- *
- * \note Used for software stencil buffer only.
- * Input: n - number of pixels in the span
- * x, y - array of [n] pixels to stencil
- * mask - array [n] of flag: 0=skip the pixel, 1=stencil the pixel
- * Output: mask - pixels which fail the stencil test will have their
- * mask flag set to 0.
- * \return GL_FALSE = all pixels failed, GL_TRUE = zero or more pixels passed.
- */
-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->Attachment[BUFFER_STENCIL].Renderbuffer;
- 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);
-
- /*
- * Perform stencil test. The results of this operation are stored
- * in the fail[] array:
- * IF fail[i] is non-zero THEN
- * the stencil fail operator is to be applied
- * ELSE
- * the stencil fail operator is not to be applied
- * ENDIF
- */
-
- switch (ctx->Stencil.Function[face]) {
- case GL_NEVER:
- /* always fail */
- 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) {
- /* passed */
- 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) {
- /* pass */
- 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) {
- /* passed */
- 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) {
- /* passed */
- 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) {
- /* passed */
- 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) {
- /* passed */
- fail[i] = 0;
- }
- else {
- fail[i] = 1;
- mask[i] = 0;
- }
- }
- else {
- fail[i] = 0;
- }
- }
- break;
- case GL_ALWAYS:
- /* always pass */
- 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;
-}
-
-
-
-
-/**
- * Apply stencil and depth testing to an array of pixels.
- * This is used both for software and hardware stencil buffers.
- *
- * The comments in this function are a bit sparse but the code is
- * almost identical to stencil_and_ztest_span(), which is well
- * commented.
- *
- * Input: n - number of pixels in the array
- * x, y - array of [n] pixel positions
- * z - array [n] of z values
- * mask - array [n] of flags (1=test this pixel, 0=skip the pixel)
- * Output: mask - array [n] of flags (1=stencil and depth test passed)
- * Return: GL_FALSE - all fragments failed the testing
- * GL_TRUE - one or more fragments passed the testing
- */
-static GLboolean
-stencil_and_ztest_pixels( GLcontext *ctx, struct sw_span *span, GLuint face )
-{
- struct gl_framebuffer *fb = ctx->DrawBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- 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)) {
- /* No direct access */
- 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);
- }
- }
-
- /* Write updated stencil values into hardware stencil buffer */
- rb->PutValues(ctx, rb, n, x, y, stencil, origMask);
-
- return GL_TRUE;
- }
- else {
- /* Direct access to stencil buffer */
-
- if (stencil_test_pixels(ctx, face, n, x, y, mask) == GL_FALSE) {
- /* all fragments failed the stencil test, we're done. */
- 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; /* one or more fragments passed both tests */
- }
-}
-
-
-/**
- * /return GL_TRUE = one or more fragments passed,
- * GL_FALSE = all fragments failed.
- */
-GLboolean
-_swrast_stencil_and_ztest_span(GLcontext *ctx, struct sw_span *span)
-{
- /* span->facing can only be non-zero if using two-sided stencil */
- 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);
-}
-
-
-#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) {
- /* totally out of bounds */
- n = 0;
- }
- else {
- /* left clip */
- if (x < 0) {
- skipPixels = -x;
- x = 0;
- n -= skipPixels;
- }
- /* right clip */
- if (x + n > bufferWidth) {
- GLint dx = x + n - bufferWidth;
- n -= dx;
- }
- }
-
- *count = n;
-
- return skipPixels;
-}
-#endif
-
-
-/**
- * Return a span of stencil values from the stencil buffer.
- * Used for glRead/CopyPixels
- * Input: n - how many pixels
- * x,y - location of first pixel
- * Output: stencil - the array of stencil values
- */
-void
-_swrast_read_stencil_span(GLcontext *ctx, struct gl_renderbuffer *rb,
- GLint n, GLint x, GLint y, GLstencil stencil[])
-{
- if (y < 0 || y >= rb->Height || x + n <= 0 || x >= rb->Width) {
- /* span is completely outside framebuffer */
- return; /* undefined values OK */
- }
-
- if (x < 0) {
- GLint dx = -x;
- x = 0;
- n -= dx;
- stencil += dx;
- }
- if (x + n > rb->Width) {
- GLint dx = x + n - rb->Width;
- n -= dx;
- }
- if (n <= 0) {
- return;
- }
-
- rb->GetRow(ctx, rb, n, x, y, stencil);
-}
-
-
-
-/**
- * Write a span of stencil values to the stencil buffer.
- * Used for glDraw/CopyPixels
- * Input: n - how many pixels
- * x, y - location of first pixel
- * stencil - the array of stencil values
- */
-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->Attachment[BUFFER_STENCIL].Renderbuffer;
- const GLuint stencilMax = (1 << fb->Visual.stencilBits) - 1;
- const GLuint stencilMask = ctx->Stencil.WriteMask[0];
-
- if (y < 0 || y >= rb->Height || x + n <= 0 || x >= rb->Width) {
- /* span is completely outside framebuffer */
- return; /* undefined values OK */
- }
- if (x < 0) {
- GLint dx = -x;
- x = 0;
- n -= dx;
- stencil += dx;
- }
- if (x + n > rb->Width) {
- GLint dx = x + n - rb->Width;
- n -= dx;
- }
- if (n <= 0) {
- return;
- }
-
- if ((stencilMask & stencilMax) != stencilMax) {
- /* need to apply writemask */
- 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);
- }
-}
-
-
-
-/**
- * Clear the stencil buffer.
- */
-void
-_swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
-{
- const GLstencil mask = ctx->Stencil.WriteMask[0];
- const GLstencil invMask = ~mask;
- const GLstencil clearVal = (ctx->Stencil.Clear & mask);
- GLint x, y, width, height;
-
- if (!rb || mask == 0)
- return;
-
- ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
- ASSERT(rb->_BaseFormat == GL_STENCIL_INDEX);
-
- /* compute region to clear */
- 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)) {
- /* Direct buffer access */
- if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
- /* need to mask the clear */
- GLint i, j;
- for (i = 0; i < height; i++) {
- GLubyte *stencil = rb->GetPointer(ctx, rb, x, y + i);
- for (j = 0; j < width; j++) {
- stencil[j] = (stencil[j] & invMask) | clearVal;
- }
- }
- }
- else {
- /* no bit masking */
- if (width == rb->Width &&
- rb->InternalFormat == GL_STENCIL_INDEX8_EXT) {
- /* optimized case */
- GLubyte *stencil = rb->GetPointer(ctx, rb, x, y);
- GLuint len = width * height * sizeof(GLubyte);
- _mesa_memset(stencil, clearVal, len);
- }
- else {
- /* general case */
- GLint i, j;
- for (i = 0; i < height; i++) {
- GLubyte *stencil = rb->GetPointer(ctx, rb, x, y + i);
- for (j = 0; j < width; j++) {
- stencil[j] = clearVal;
- }
- }
- }
- }
- }
- else {
- /* no direct access */
- if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
- /* need to mask the clear */
- 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 {
- /* no bit masking */
- const GLubyte clear8 = clearVal;
- GLint i;
- for (i = 0; i < height; i++) {
- rb->PutMonoRow(ctx, rb, width, x, y + i, &clear8, NULL);
- }
- }
- }
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-30 02:04:23 +0000