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clean-up of stencil code

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Brian 2007-07-11 16:33:15 -06:00
parent b755a2d9de
commit 3ffa09b09d
1 changed files with 35 additions and 50 deletions
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85
src/mesa/swrast/s_stencil.c
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@ -1,8 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 6.5
* Version: 7.1
*
* Copyright (C) 1999-2005 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"),
@ -392,6 +392,23 @@ do_stencil_test( GLcontext *ctx, GLuint face, GLuint n, GLstencil stencil[],
}
/**
* Compute the zpass/zfail masks by comparing the pre- and post-depth test
* masks.
*/
static INLINE void
compute_pass_fail_masks(GLuint n, const GLubyte origMask[],
const GLubyte newMask[],
GLubyte passMask[], GLubyte failMask[])
{
GLuint i;
for (i = 0; i < n; i++) {
ASSERT(newMask[i] == 0 || newMask[i] == 1);
passMask[i] = origMask[i] & newMask[i];
failMask[i] = origMask[i] & (newMask[i] ^ 1);
}
}
/**
* Apply stencil and depth testing to the span of pixels.
@ -460,39 +477,24 @@ stencil_and_ztest_span(GLcontext *ctx, SWspan *span, GLuint face)
/*
* Perform depth buffering, then apply zpass or zfail stencil function.
*/
GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH];
GLuint i;
GLubyte passMask[MAX_WIDTH], failMask[MAX_WIDTH], origMask[MAX_WIDTH];
/* save the current mask bits */
_mesa_memcpy(oldmask, mask, n * sizeof(GLubyte));
_mesa_memcpy(origMask, 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);
}
compute_pass_fail_masks(n, origMask, mask, passMask, failMask);
/* 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 );
n, stencil, failMask );
}
if (ctx->Stencil.ZPassFunc[face] != GL_KEEP) {
apply_stencil_op( ctx, ctx->Stencil.ZPassFunc[face], face,
n, stencil, passmask );
n, stencil, passMask );
}
}
@ -902,6 +904,7 @@ stencil_test_pixels( GLcontext *ctx, GLuint face, GLuint n,
static GLboolean
stencil_and_ztest_pixels( GLcontext *ctx, SWspan *span, GLuint face )
{
GLubyte passMask[MAX_WIDTH], failMask[MAX_WIDTH], origMask[MAX_WIDTH];
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->_StencilBuffer;
const GLuint n = span->end;
@ -916,13 +919,10 @@ stencil_and_ztest_pixels( GLcontext *ctx, SWspan *span, GLuint face )
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) {
@ -930,27 +930,19 @@ stencil_and_ztest_pixels( GLcontext *ctx, SWspan *span, GLuint face )
n, stencil, mask);
}
else {
_mesa_memcpy(origMask, mask, n * sizeof(GLubyte));
_swrast_depth_test_span(ctx, span);
compute_pass_fail_masks(n, origMask, mask, passMask, failMask);
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);
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);
n, stencil, passMask);
}
}
@ -972,28 +964,21 @@ stencil_and_ztest_pixels( GLcontext *ctx, SWspan *span, GLuint face )
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));
_mesa_memcpy(origMask, 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);
}
compute_pass_fail_masks(n, origMask, mask, passMask, failMask);
if (ctx->Stencil.ZFailFunc[face] != GL_KEEP) {
apply_stencil_op_to_pixels(ctx, n, x, y,
ctx->Stencil.ZFailFunc[face],
face, failmask);
face, failMask);
}
if (ctx->Stencil.ZPassFunc[face] != GL_KEEP) {
apply_stencil_op_to_pixels(ctx, n, x, y,
ctx->Stencil.ZPassFunc[face],
face, passmask);
face, passMask);
}
}