source: vbox/trunk/src/VBox/GuestHost/OpenGL/state_tracker/state_stencil.c@ 20975

/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include <stdio.h>
#include "state.h"
#include "state/cr_statetypes.h"
#include "state_internals.h"

void crStateStencilInit(CRContext *ctx)
{
        CRStencilState *s = &ctx->stencil;
        CRStateBits *stateb = GetCurrentBits();
        CRStencilBits *sb = &(stateb->stencil);

        s->stencilTest = GL_FALSE;
        RESET(sb->enable, ctx->bitid);

        s->func = GL_ALWAYS;
        s->mask = 0xFFFFFFFF;
        s->ref = 0;
        RESET(sb->func, ctx->bitid);

        s->fail = GL_KEEP;
        s->passDepthFail = GL_KEEP;
        s->passDepthPass = GL_KEEP;
        RESET(sb->op, ctx->bitid);

        s->clearValue = 0;
        RESET(sb->clearValue, ctx->bitid);

        s->writeMask = 0xFFFFFFFF;
        RESET(sb->writeMask, ctx->bitid);

        RESET(sb->dirty, ctx->bitid);
}

void STATE_APIENTRY crStateStencilFunc(GLenum func, GLint ref, GLuint mask) 
{
        CRContext *g = GetCurrentContext();
        CRStencilState *s = &(g->stencil);
        CRStateBits *stateb = GetCurrentBits();
        CRStencilBits *sb = &(stateb->stencil);


        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, 
                        "glStencilFunc called in begin/end");
                return;
        }

        FLUSH();

        if (func != GL_NEVER &&
                func != GL_LESS &&
                func != GL_LEQUAL &&
                func != GL_GREATER &&
                func != GL_GEQUAL &&
                func != GL_EQUAL &&
                func != GL_NOTEQUAL &&
                func != GL_ALWAYS)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_ENUM, 
                        "glStencilFunc called with bogu func: %d", func);
                return;
        }

        s->func = func;
        s->ref = ref;
        s->mask = mask;

        DIRTY(sb->func, g->neg_bitid);
        DIRTY(sb->dirty, g->neg_bitid);
}

void STATE_APIENTRY crStateStencilOp (GLenum fail, GLenum zfail, GLenum zpass) 
{
        CRContext *g = GetCurrentContext();
        CRStencilState *s = &(g->stencil);
        CRStateBits *stateb = GetCurrentBits();
        CRStencilBits *sb = &(stateb->stencil);

        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, 
                        "glStencilOp called in begin/end");
                return;
        }

        FLUSH();

        switch (fail) {
        case GL_KEEP:
        case GL_ZERO:
        case GL_REPLACE:
        case GL_INCR:
        case GL_DECR:
        case GL_INVERT:
#ifdef CR_EXT_stencil_wrap
        case GL_INCR_WRAP_EXT:
        case GL_DECR_WRAP_EXT:
#endif
                break;
        default:
                crStateError(__LINE__, __FILE__, GL_INVALID_ENUM, 
                        "glStencilOp called with bogus fail: %d", fail);
                return;
        }

        switch (zfail) {
        case GL_KEEP:
        case GL_ZERO:
        case GL_REPLACE:
        case GL_INCR:
        case GL_DECR:
        case GL_INVERT:
#ifdef CR_EXT_stencil_wrap
        case GL_INCR_WRAP_EXT:
        case GL_DECR_WRAP_EXT:
#endif
                break;
        default:
                crStateError(__LINE__, __FILE__, GL_INVALID_ENUM, 
                        "glStencilOp called with bogus zfail: %d", zfail);
                return;
        }

        switch (zpass) {
        case GL_KEEP:
        case GL_ZERO:
        case GL_REPLACE:
        case GL_INCR:
        case GL_DECR:
        case GL_INVERT:
#ifdef CR_EXT_stencil_wrap
        case GL_INCR_WRAP_EXT:
        case GL_DECR_WRAP_EXT:
#endif
                break;
        default:
                crStateError(__LINE__, __FILE__, GL_INVALID_ENUM, 
                        "glStencilOp called with bogus zpass: %d", zpass);
                return;
        }

        s->fail = fail;
        s->passDepthFail = zfail;
        s->passDepthPass = zpass;

        DIRTY(sb->op, g->neg_bitid);
        DIRTY(sb->dirty, g->neg_bitid);
}


void STATE_APIENTRY crStateClearStencil (GLint c) 
{
        CRContext *g = GetCurrentContext();
        CRStencilState *s = &(g->stencil);
        CRStateBits *stateb = GetCurrentBits();
        CRStencilBits *sb = &(stateb->stencil);

        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, 
                        "glClearStencil called in begin/end");
                return;
        }

        FLUSH();


        s->clearValue = c;
        
        DIRTY(sb->clearValue, g->neg_bitid);
        DIRTY(sb->dirty, g->neg_bitid);
}

void STATE_APIENTRY crStateStencilMask (GLuint mask) 
{
        CRContext *g = GetCurrentContext();
        CRStencilState *s = &(g->stencil);
        CRStateBits *stateb = GetCurrentBits();
        CRStencilBits *sb = &(stateb->stencil);

        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, 
                        "glStencilMask called in begin/end");
                return;
        }

        FLUSH();

        s->writeMask = mask;

        DIRTY(sb->writeMask, g->neg_bitid);
        DIRTY(sb->dirty, g->neg_bitid);
}