via_state.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

             */
            vmesa->regHABLCop |= HC_HABLFCb_OPC | HC_HABLFCb_Asrc;
            vmesa->regHABLAop |= HC_HABLFAb_OPA | HC_HABLFAb_Asrc;
            break;
        case GL_ONE_MINUS_SRC_ALPHA:
            /* (1, 1, 1, 1) - (As, As, As, As)
             */
            vmesa->regHABLCop |= HC_HABLFCb_InvOPC | HC_HABLFCb_Asrc;
            vmesa->regHABLAop |= HC_HABLFAb_InvOPA | HC_HABLFAb_Asrc;
            break;
        case GL_DST_ALPHA:
            {
                if (vmesa->viaScreen->bitsPerPixel == 16) {
                    /* (1, 1, 1, 1)
                     */
                    vmesa->regHABLCop |= HC_HABLFCb_InvOPC | HC_HABLFCb_HABLRCb;
                    vmesa->regHABLAop |= HC_HABLFAb_InvOPA | HC_HABLFAb_HABLFRA;
                    vmesa->regHABLRFCb = 0x0;
                    vmesa->regHABLRAb = 0x0;
                }
                else {
                    /* (Ad, Ad, Ad, Ad)
                     */
                    vmesa->regHABLCop |= HC_HABLFCb_OPC | HC_HABLFCb_Adst;
                    vmesa->regHABLAop |= HC_HABLFAb_OPA | HC_HABLFAb_Adst;
                }
            }
            break;
        case GL_ONE_MINUS_DST_ALPHA:
            {
                if (vmesa->viaScreen->bitsPerPixel == 16) {
                    /* (1, 1, 1, 1) - (1, 1, 1, 1) = (0, 0, 0, 0)
                     */
                    vmesa->regHABLCop |= HC_HABLFCb_OPC | HC_HABLFCb_HABLRCb;
                    vmesa->regHABLAop |= HC_HABLFAb_OPA | HC_HABLFAb_HABLFRA;
                    vmesa->regHABLRFCb = 0x0;
                    vmesa->regHABLRAb = 0x0;
                }
                else {
                    /* (1, 1, 1, 1) - (Ad, Ad, Ad, Ad)
                     */
                    vmesa->regHABLCop |= HC_HABLFCb_InvOPC | HC_HABLFCb_Adst;
                    vmesa->regHABLAop |= HC_HABLFAb_InvOPA | HC_HABLFAb_Adst;
                }
            }
            break;
        default:
            vmesa->regHABLCop |= HC_HABLFCb_OPC | HC_HABLFCb_HABLRCb;
            vmesa->regHABLAop |= HC_HABLFAb_OPA | HC_HABLFAb_HABLFRA;
            vmesa->regHABLRFCb = 0x0;
            vmesa->regHABLRAb = 0x0;
            break;
        }

        if (vmesa->viaScreen->bitsPerPixel <= 16)
            vmesa->regEnable &= ~HC_HenDT_MASK;

    }
    else {
        vmesa->regEnable &= (~HC_HenABL_MASK);
    }

    if (ctx->Color.AlphaEnabled) {
        vmesa->regEnable |= HC_HenAT_MASK;
        vmesa->regHATMD = FLOAT_TO_UBYTE(ctx->Color.AlphaRef) |
            ((ctx->Color.AlphaFunc - GL_NEVER) << 8);
    }
    else {
        vmesa->regEnable &= (~HC_HenAT_MASK);
    }

    if (ctx->Color.DitherFlag && (vmesa->viaScreen->bitsPerPixel < 32)) {
        if (ctx->Color.BlendEnabled) {
            vmesa->regEnable &= ~HC_HenDT_MASK;
        }
        else {
            vmesa->regEnable |= HC_HenDT_MASK;
        }
    }


    vmesa->regEnable &= ~HC_HenDT_MASK;

    if (ctx->Color.ColorLogicOpEnabled) 
        vmesa->regHROP = ROP[ctx->Color.LogicOp & 0xF];
    else
        vmesa->regHROP = HC_HROP_P;

    vmesa->regHFBBMSKL = PACK_COLOR_888(ctx->Color.ColorMask[0],
					ctx->Color.ColorMask[1],
					ctx->Color.ColorMask[2]);
    vmesa->regHROP |= ctx->Color.ColorMask[3];

    if (ctx->Color.ColorMask[3])
        vmesa->regEnable |= HC_HenAW_MASK;
    else
        vmesa->regEnable &= ~HC_HenAW_MASK;
}

static void viaChooseFogState(GLcontext *ctx) 
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    if (ctx->Fog.Enabled) {
        GLubyte r, g, b, a;

        vmesa->regEnable |= HC_HenFOG_MASK;

        /* Use fog equation 0 (OpenGL's default) & local fog.
         */
        vmesa->regHFogLF = 0x0;

        r = (GLubyte)(ctx->Fog.Color[0] * 255.0F);
        g = (GLubyte)(ctx->Fog.Color[1] * 255.0F);
        b = (GLubyte)(ctx->Fog.Color[2] * 255.0F);
        a = (GLubyte)(ctx->Fog.Color[3] * 255.0F);
        vmesa->regHFogCL = (r << 16) | (g << 8) | b;
        vmesa->regHFogCH = a;
    }
    else {
        vmesa->regEnable &= ~HC_HenFOG_MASK;
    }
}

static void viaChooseDepthState(GLcontext *ctx) 
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    if (ctx->Depth.Test) {
        vmesa->regEnable |= HC_HenZT_MASK;
        if (ctx->Depth.Mask)
            vmesa->regEnable |= HC_HenZW_MASK;
        else
            vmesa->regEnable &= (~HC_HenZW_MASK);
	vmesa->regHZWTMD = (ctx->Depth.Func - GL_NEVER) << 16;
	
    }
    else {
        vmesa->regEnable &= ~HC_HenZT_MASK;
        
        /*=* [DBG] racer : can't display cars in car selection menu *=*/
	/*if (ctx->Depth.Mask)
            vmesa->regEnable |= HC_HenZW_MASK;
        else
            vmesa->regEnable &= (~HC_HenZW_MASK);*/
	vmesa->regEnable &= (~HC_HenZW_MASK);
    }
}

static void viaChooseLineState(GLcontext *ctx) 
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    if (ctx->Line.StippleFlag) {
        vmesa->regEnable |= HC_HenLP_MASK;
        vmesa->regHLP = ctx->Line.StipplePattern;
        vmesa->regHLPRF = ctx->Line.StippleFactor;
    }
    else {
        vmesa->regEnable &= ~HC_HenLP_MASK;
    }
}

static void viaChoosePolygonState(GLcontext *ctx) 
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

#if 0
    /* Polygon stipple is broken - see via_state.c
     */
    if (ctx->Polygon.StippleFlag) {
        vmesa->regEnable |= HC_HenSP_MASK;
    }
    else {
        vmesa->regEnable &= ~HC_HenSP_MASK;
    }
#else
    FALLBACK(vmesa, VIA_FALLBACK_POLY_STIPPLE, 
	     ctx->Polygon.StippleFlag);
#endif

    if (ctx->Polygon.CullFlag) {
        vmesa->regEnable |= HC_HenFBCull_MASK;
    }
    else {
        vmesa->regEnable &= ~HC_HenFBCull_MASK;
    }
}

static void viaChooseStencilState(GLcontext *ctx) 
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    
    if (ctx->Stencil.Enabled) {
        GLuint temp;

        vmesa->regEnable |= HC_HenST_MASK;
        temp = (ctx->Stencil.Ref[0] & 0xFF) << HC_HSTREF_SHIFT;
        temp |= 0xFF << HC_HSTOPMSK_SHIFT;
        temp |= (ctx->Stencil.ValueMask[0] & 0xFF);
        vmesa->regHSTREF = temp;

        temp = (ctx->Stencil.Function[0] - GL_NEVER) << 16;

        switch (ctx->Stencil.FailFunc[0]) {
        case GL_KEEP:
            temp |= HC_HSTOPSF_KEEP;
            break;
        case GL_ZERO:
            temp |= HC_HSTOPSF_ZERO;
            break;
        case GL_REPLACE:
            temp |= HC_HSTOPSF_REPLACE;
            break;
        case GL_INVERT:
            temp |= HC_HSTOPSF_INVERT;
            break;
        case GL_INCR:
            temp |= HC_HSTOPSF_INCR;
            break;
        case GL_DECR:
            temp |= HC_HSTOPSF_DECR;
            break;
        }

        switch (ctx->Stencil.ZFailFunc[0]) {
        case GL_KEEP:
            temp |= HC_HSTOPSPZF_KEEP;
            break;
        case GL_ZERO:
            temp |= HC_HSTOPSPZF_ZERO;
            break;
        case GL_REPLACE:
            temp |= HC_HSTOPSPZF_REPLACE;
            break;
        case GL_INVERT:
            temp |= HC_HSTOPSPZF_INVERT;
            break;
        case GL_INCR:
            temp |= HC_HSTOPSPZF_INCR;
            break;
        case GL_DECR:
            temp |= HC_HSTOPSPZF_DECR;
            break;
        }

        switch (ctx->Stencil.ZPassFunc[0]) {
        case GL_KEEP:
            temp |= HC_HSTOPSPZP_KEEP;
            break;
        case GL_ZERO:
            temp |= HC_HSTOPSPZP_ZERO;
            break;
        case GL_REPLACE:
            temp |= HC_HSTOPSPZP_REPLACE;
            break;
        case GL_INVERT:
            temp |= HC_HSTOPSPZP_INVERT;
            break;
        case GL_INCR:
            temp |= HC_HSTOPSPZP_INCR;
            break;
        case GL_DECR:
            temp |= HC_HSTOPSPZP_DECR;
            break;
        }
        vmesa->regHSTMD = temp;
    }
    else {
        vmesa->regEnable &= ~HC_HenST_MASK;
    }
}



static void viaChooseTriangle(GLcontext *ctx) 
{       
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    if (ctx->Polygon.CullFlag == GL_TRUE) {
        switch (ctx->Polygon.CullFaceMode) {
        case GL_FRONT:
            if (ctx->Polygon.FrontFace == GL_CCW)
                vmesa->regCmdB |= HC_HBFace_MASK;
            else
                vmesa->regCmdB &= ~HC_HBFace_MASK;
            break;
        case GL_BACK:
            if (ctx->Polygon.FrontFace == GL_CW)
                vmesa->regCmdB |= HC_HBFace_MASK;
            else
                vmesa->regCmdB &= ~HC_HBFace_MASK;
            break;
        case GL_FRONT_AND_BACK:
            return;
        }
    }
}

void viaValidateState( GLcontext *ctx )
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    if (vmesa->newState & _NEW_TEXTURE) {
       GLboolean ok = (viaChooseTextureState(ctx) &&
		       viaUpdateTextureState(ctx));

       FALLBACK(vmesa, VIA_FALLBACK_TEXTURE, !ok);
    }

    if (vmesa->newState & _NEW_COLOR)
        viaChooseColorState(ctx);

    if (vmesa->newState & _NEW_DEPTH)
        viaChooseDepthState(ctx);

    if (vmesa->newState & _NEW_FOG)
        viaChooseFogState(ctx);

    if (vmesa->newState & _NEW_LINE)
        viaChooseLineState(ctx);

    if (vmesa->newState & (_NEW_POLYGON | _NEW_POLYGONSTIPPLE)) {
        viaChoosePolygonState(ctx);
	viaChooseTriangle(ctx);
    }

    if ((vmesa->newState & _NEW_STENCIL) && vmesa->have_hw_stencil)
        viaChooseStencilState(ctx);
    
    if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
        vmesa->regEnable |= HC_HenCS_MASK;
    else
        vmesa->regEnable &= ~HC_HenCS_MASK;

    if (ctx->Point.SmoothFlag ||
	ctx->Line.SmoothFlag ||
	ctx->Polygon.SmoothFlag)
        vmesa->regEnable |= HC_HenAA_MASK;
    else 
        vmesa->regEnable &= ~HC_HenAA_MASK;

    vmesa->newEmitState |= vmesa->newState;
    vmesa->newState = 0;
}

static void viaInvalidateState(GLcontext *ctx, GLuint newState)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    VIA_FINISH_PRIM( vmesa );
    vmesa->newState |= newState;

    _swrast_InvalidateState(ctx, newState);
    _swsetup_InvalidateState(ctx, newState);
    _vbo_InvalidateState(ctx, newState);
    _tnl_InvalidateState(ctx, newState);
}

void viaInitStateFuncs(GLcontext *ctx)
{
    /* Callbacks for internal Mesa events.
     */
    ctx->Driver.UpdateState = viaInvalidateState;

    /* API callbacks
     */
    ctx->Driver.BlendEquationSeparate = viaBlendEquationSeparate;
    ctx->Driver.BlendFuncSeparate = viaBlendFuncSeparate;
    ctx->Driver.ClearColor = viaClearColor;
    ctx->Driver.ColorMask = viaColorMask;
    ctx->Driver.DrawBuffer = viaDrawBuffer;
    ctx->Driver.RenderMode = viaRenderMode;
    ctx->Driver.Scissor = viaScissor;
    ctx->Driver.DepthRange = viaDepthRange;
    ctx->Driver.Viewport = viaViewport;
    ctx->Driver.Enable = viaEnable;

    /* XXX this should go away */
    ctx->Driver.ResizeBuffers = viaReAllocateBuffers;
}