state.c

这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统

            break;

        case WINED3DBLEND_BOTHSRCALPHA       : dstBlend = GL_SRC_ALPHA;
            srcBlend = GL_SRC_ALPHA;
            break;

        case WINED3DBLEND_BOTHINVSRCALPHA    : dstBlend = GL_ONE_MINUS_SRC_ALPHA;
            srcBlend = GL_ONE_MINUS_SRC_ALPHA;
            break;

        case WINED3DBLEND_BLENDFACTOR        : dstBlend = GL_CONSTANT_COLOR;   break;
        case WINED3DBLEND_INVBLENDFACTOR     : dstBlend = GL_ONE_MINUS_CONSTANT_COLOR;  break;
        default:
            FIXME("Unrecognized dst blend value %d\n", stateblock->renderState[WINED3DRS_DESTBLEND]);
    }

    if(stateblock->renderState[WINED3DRS_EDGEANTIALIAS] ||
       stateblock->renderState[WINED3DRS_ANTIALIASEDLINEENABLE]) {
        glEnable(GL_LINE_SMOOTH);
        checkGLcall("glEnable(GL_LINE_SMOOTH)");
        if(srcBlend != GL_SRC_ALPHA) {
            WARN("WINED3DRS_EDGEANTIALIAS enabled, but unexpected src blending param\n");
        }
        if(dstBlend != GL_ONE_MINUS_SRC_ALPHA && dstBlend != GL_ONE) {
            WARN("WINED3DRS_EDGEANTIALIAS enabled, but unexpected dst blending param\n");
        }
    } else {
        glDisable(GL_LINE_SMOOTH);
        checkGLcall("glDisable(GL_LINE_SMOOTH)");
    }

    TRACE("glBlendFunc src=%x, dst=%x\n", srcBlend, dstBlend);
    glBlendFunc(srcBlend, dstBlend);
    checkGLcall("glBlendFunc");
}

static void state_blendfactor(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    float col[4];

    TRACE("Setting BlendFactor to %d\n", stateblock->renderState[WINED3DRS_BLENDFACTOR]);
    D3DCOLORTOGLFLOAT4(stateblock->renderState[WINED3DRS_BLENDFACTOR], col);
    GL_EXTCALL(glBlendColor (col[0],col[1],col[2],col[3]));
    checkGLcall("glBlendColor");
}

static void state_alpha(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    int glParm = 0;
    float ref;
    BOOL enable_ckey = FALSE;

    IWineD3DSurfaceImpl *surf;

    /* Find out if the texture on the first stage has a ckey set
     * The alpha state func reads the texture settings, even though alpha and texture are not grouped
     * together. This is to avoid making a huge alpha+texture+texture stage+ckey block due to the hardly
     * used WINED3DRS_COLORKEYENABLE state(which is d3d <= 3 only). The texture function will call alpha
     * in case it finds some texture+colorkeyenable combination which needs extra care.
     */
    if(stateblock->textures[0] && stateblock->textureDimensions[0] == GL_TEXTURE_2D) {
        surf = (IWineD3DSurfaceImpl *) ((IWineD3DTextureImpl *)stateblock->textures[0])->surfaces[0];

        if(surf->CKeyFlags & WINEDDSD_CKSRCBLT) {
            const StaticPixelFormatDesc *fmt = getFormatDescEntry(surf->resource.format, NULL, NULL);
            /* The surface conversion does not do color keying conversion for surfaces that have an alpha
             * channel on their own. Likewise, the alpha test shouldn't be set up for color keying if the
             * surface has alpha bits
             */
            if(fmt->alphaMask == 0x00000000) {
                enable_ckey = TRUE;
            }
        }
    }

    if(enable_ckey || context->last_was_ckey) {
        StateTable[STATE_TEXTURESTAGE(0, WINED3DTSS_ALPHAOP)].apply(STATE_TEXTURESTAGE(0, WINED3DTSS_ALPHAOP), stateblock, context);
    }
    context->last_was_ckey = enable_ckey;

    if (stateblock->renderState[WINED3DRS_ALPHATESTENABLE] ||
        (stateblock->renderState[WINED3DRS_COLORKEYENABLE] && enable_ckey)) {
        glEnable(GL_ALPHA_TEST);
        checkGLcall("glEnable GL_ALPHA_TEST");
    } else {
        glDisable(GL_ALPHA_TEST);
        checkGLcall("glDisable GL_ALPHA_TEST");
        /* Alpha test is disabled, don't bother setting the params - it will happen on the next
         * enable call
         */
        return;
    }

    if(stateblock->renderState[WINED3DRS_COLORKEYENABLE] && enable_ckey) {
        glParm = GL_NOTEQUAL;
        ref = 0.0;
    } else {
        ref = ((float) stateblock->renderState[WINED3DRS_ALPHAREF]) / 255.0f;
        glParm = CompareFunc(stateblock->renderState[WINED3DRS_ALPHAFUNC]);
    }
    if(glParm) {
        glAlphaFunc(glParm, ref);
        checkGLcall("glAlphaFunc");
    }
}

static void state_clipping(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    DWORD enable  = 0xFFFFFFFF;
    DWORD disable = 0x00000000;

    if (use_vs(stateblock->wineD3DDevice)) {
        /* The spec says that opengl clipping planes are disabled when using shaders. Direct3D planes aren't,
         * so that is an issue. The MacOS ATI driver keeps clipping planes activated with shaders in some
         * contitions I got sick of tracking down. The shader state handler disables all clip planes because
         * of that - don't do anything here and keep them disabled
         */
        if(stateblock->renderState[WINED3DRS_CLIPPLANEENABLE]) {
            static BOOL warned = FALSE;
            if(!warned) {
                FIXME("Clipping not supported with vertex shaders\n");
                warned = TRUE;
            }
        }
        return;
    }

    /* TODO: Keep track of previously enabled clipplanes to avoid unnecessary resetting
     * of already set values
     */

    /* If enabling / disabling all
     * TODO: Is this correct? Doesn't D3DRS_CLIPPING disable clipping on the viewport frustrum?
     */
    if (stateblock->renderState[WINED3DRS_CLIPPING]) {
        enable  = stateblock->renderState[WINED3DRS_CLIPPLANEENABLE];
        disable = ~stateblock->renderState[WINED3DRS_CLIPPLANEENABLE];
    } else {
        disable = 0xffffffff;
        enable  = 0x00;
    }

    if (enable & WINED3DCLIPPLANE0)  { glEnable(GL_CLIP_PLANE0);  checkGLcall("glEnable(clip plane 0)"); }
    if (enable & WINED3DCLIPPLANE1)  { glEnable(GL_CLIP_PLANE1);  checkGLcall("glEnable(clip plane 1)"); }
    if (enable & WINED3DCLIPPLANE2)  { glEnable(GL_CLIP_PLANE2);  checkGLcall("glEnable(clip plane 2)"); }
    if (enable & WINED3DCLIPPLANE3)  { glEnable(GL_CLIP_PLANE3);  checkGLcall("glEnable(clip plane 3)"); }
    if (enable & WINED3DCLIPPLANE4)  { glEnable(GL_CLIP_PLANE4);  checkGLcall("glEnable(clip plane 4)"); }
    if (enable & WINED3DCLIPPLANE5)  { glEnable(GL_CLIP_PLANE5);  checkGLcall("glEnable(clip plane 5)"); }

    if (disable & WINED3DCLIPPLANE0) { glDisable(GL_CLIP_PLANE0); checkGLcall("glDisable(clip plane 0)"); }
    if (disable & WINED3DCLIPPLANE1) { glDisable(GL_CLIP_PLANE1); checkGLcall("glDisable(clip plane 1)"); }
    if (disable & WINED3DCLIPPLANE2) { glDisable(GL_CLIP_PLANE2); checkGLcall("glDisable(clip plane 2)"); }
    if (disable & WINED3DCLIPPLANE3) { glDisable(GL_CLIP_PLANE3); checkGLcall("glDisable(clip plane 3)"); }
    if (disable & WINED3DCLIPPLANE4) { glDisable(GL_CLIP_PLANE4); checkGLcall("glDisable(clip plane 4)"); }
    if (disable & WINED3DCLIPPLANE5) { glDisable(GL_CLIP_PLANE5); checkGLcall("glDisable(clip plane 5)"); }

    /** update clipping status */
    if (enable) {
        stateblock->clip_status.ClipUnion = 0;
        stateblock->clip_status.ClipIntersection = 0xFFFFFFFF;
    } else {
        stateblock->clip_status.ClipUnion = 0;
        stateblock->clip_status.ClipIntersection = 0;
    }
}

static void state_blendop(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    int glParm = GL_FUNC_ADD;

    if(!GL_SUPPORT(EXT_BLEND_MINMAX)) {
        WARN("Unsupported in local OpenGL implementation: glBlendEquation\n");
        return;
    }

    switch ((WINED3DBLENDOP) stateblock->renderState[WINED3DRS_BLENDOP]) {
        case WINED3DBLENDOP_ADD              : glParm = GL_FUNC_ADD;              break;
        case WINED3DBLENDOP_SUBTRACT         : glParm = GL_FUNC_SUBTRACT;         break;
        case WINED3DBLENDOP_REVSUBTRACT      : glParm = GL_FUNC_REVERSE_SUBTRACT; break;
        case WINED3DBLENDOP_MIN              : glParm = GL_MIN;                   break;
        case WINED3DBLENDOP_MAX              : glParm = GL_MAX;                   break;
        default:
            FIXME("Unrecognized/Unhandled D3DBLENDOP value %d\n", stateblock->renderState[WINED3DRS_BLENDOP]);
    }

    TRACE("glBlendEquation(%x)\n", glParm);
    GL_EXTCALL(glBlendEquation(glParm));
    checkGLcall("glBlendEquation");
}

static void
state_specularenable(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    /* Originally this used glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,GL_SEPARATE_SPECULAR_COLOR)
     * and (GL_LIGHT_MODEL_COLOR_CONTROL,GL_SINGLE_COLOR) to swap between enabled/disabled
     * specular color. This is wrong:
     * Separate specular color means the specular colour is maintained separately, whereas
     * single color means it is merged in. However in both cases they are being used to
     * some extent.
     * To disable specular color, set it explicitly to black and turn off GL_COLOR_SUM_EXT
     * NOTE: If not supported don't give FIXMEs the impact is really minimal and very few people are
     * running 1.4 yet!
     *
     *
     * If register combiners are enabled, enabling / disabling GL_COLOR_SUM has no effect.
     * Instead, we need to setup the FinalCombiner properly.
     *
     * The default setup for the FinalCombiner is:
     *
     * <variable>       <input>                             <mapping>               <usage>
     * GL_VARIABLE_A_NV GL_FOG,                             GL_UNSIGNED_IDENTITY_NV GL_ALPHA
     * GL_VARIABLE_B_NV GL_SPARE0_PLUS_SECONDARY_COLOR_NV   GL_UNSIGNED_IDENTITY_NV GL_RGB
     * GL_VARIABLE_C_NV GL_FOG                              GL_UNSIGNED_IDENTITY_NV GL_RGB
     * GL_VARIABLE_D_NV GL_ZERO                             GL_UNSIGNED_IDENTITY_NV GL_RGB
     * GL_VARIABLE_E_NV GL_ZERO                             GL_UNSIGNED_IDENTITY_NV GL_RGB
     * GL_VARIABLE_F_NV GL_ZERO                             GL_UNSIGNED_IDENTITY_NV GL_RGB
     * GL_VARIABLE_G_NV GL_SPARE0_NV                        GL_UNSIGNED_IDENTITY_NV GL_ALPHA
     *
     * That's pretty much fine as it is, except for variable B, which needs to take
     * either GL_SPARE0_PLUS_SECONDARY_COLOR_NV or GL_SPARE0_NV, depending on
     * whether WINED3DRS_SPECULARENABLE is enabled or not.
     */

    TRACE("Setting specular enable state and materials\n");
    if (stateblock->renderState[WINED3DRS_SPECULARENABLE]) {
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, (float*) &stateblock->material.Specular);
        checkGLcall("glMaterialfv");

        if(stateblock->material.Power > 128.0) {
            /* glMaterialf man page says that the material says that GL_SHININESS must be between 0.0
             * and 128.0, although in d3d neither -1 nor 129 produce an error. For values > 128 clamp
             * them, since 128 results in a hardly visible specular highlight, so it should be safe to
             * to clamp to 128
             */
            WARN("Material power > 128\n");
            glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 128.0);
        } else {
            glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, stateblock->material.Power);
        }
        checkGLcall("glMaterialf(GL_SHININESS");

        if (GL_SUPPORT(EXT_SECONDARY_COLOR)) {
            glEnable(GL_COLOR_SUM_EXT);
        } else {
            TRACE("Specular colors cannot be enabled in this version of opengl\n");
        }
        checkGLcall("glEnable(GL_COLOR_SUM)");

        if (GL_SUPPORT(NV_REGISTER_COMBINERS)) {
            GL_EXTCALL(glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_SPARE0_PLUS_SECONDARY_COLOR_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB));
            checkGLcall("glFinalCombinerInputNV()");
        }
    } else {
        float black[4] = {0.0f, 0.0f, 0.0f, 0.0f};

        /* for the case of enabled lighting: */
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, &black[0]);
        checkGLcall("glMaterialfv");

        /* for the case of disabled lighting: */
        if (GL_SUPPORT(EXT_SECONDARY_COLOR)) {
            glDisable(GL_COLOR_SUM_EXT);
        } else {
            TRACE("Specular colors cannot be disabled in this version of opengl\n");
        }
        checkGLcall("glDisable(GL_COLOR_SUM)");

        if (GL_SUPPORT(NV_REGISTER_COMBINERS)) {
            GL_EXTCALL(glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB));
            checkGLcall("glFinalCombinerInputNV()");
        }
    }

    TRACE("(%p) : Diffuse (%f,%f,%f,%f)\n", stateblock->wineD3DDevice, stateblock->material.Diffuse.r, stateblock->material.Diffuse.g,
          stateblock->material.Diffuse.b, stateblock->material.Diffuse.a);
    TRACE("(%p) : Ambient (%f,%f,%f,%f)\n", stateblock->wineD3DDevice, stateblock->material.Ambient.r, stateblock->material.Ambient.g,
          stateblock->material.Ambient.b, stateblock->material.Ambient.a);
    TRACE("(%p) : Specular (%f,%f,%f,%f)\n", stateblock->wineD3DDevice, stateblock->material.Specular.r, stateblock->material.Specular.g,
          stateblock->material.Specular.b, stateblock->material.Specular.a);
    TRACE("(%p) : Emissive (%f,%f,%f,%f)\n", stateblock->wineD3DDevice, stateblock->material.Emissive.r, stateblock->material.Emissive.g,
          stateblock->material.Emissive.b, stateblock->material.Emissive.a);

    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, (float*) &stateblock->material.Ambient);
    checkGLcall("glMaterialfv(GL_AMBIENT)");
    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, (float*) &stateblock->material.Diffuse);
    checkGLcall("glMaterialfv(GL_DIFFUSE)");
    glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, (float*) &stateblock->material.Emissive);
    checkGLcall("glMaterialfv(GL_EMISSION)");
}

static void state_texfactor(DWORD state, IWineD3DStateBlockImpl *stateblock, WineD3DContext *context) {
    unsigned int i;

    /* Note the texture color applies to all textures whereas
     * GL_TEXTURE_ENV_COLOR applies to active only
     */