via_state.c

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

	 }
	 else if (numLevels > 1) {
	    BEGIN_RING(12 + numLevels * 2);
	    OUT_RING( HC_HEADER2 );
	    OUT_RING( (HC_ParaType_Tex << 16) |  (texunit << 24) );
	    OUT_RING( t->regTexFM );
	    OUT_RING( (HC_SubA_HTXnL0OS << 24) |
	       ((t->lastLevel) << HC_HTXnLVmax_SHIFT) | t->firstLevel );
	    OUT_RING( t->regTexWidthLog2[0] );
	    OUT_RING( t->regTexHeightLog2[0] );
		
	    if (numLevels > 6) {
	       OUT_RING( t->regTexWidthLog2[1] );
	       OUT_RING( t->regTexHeightLog2[1] );
	       i += 2;
	    }
                
	    OUT_RING( t->regTexBaseH[0] );
		
	    if (numLevels > 3) { 
	       OUT_RING( t->regTexBaseH[1] );
	    }
	    if (numLevels > 6) {
	       OUT_RING( t->regTexBaseH[2] );
	    }
	    if (numLevels > 9)  {
	       OUT_RING( t->regTexBaseH[3] );
	    }
		
	    for (j = 0; j < numLevels; j++) {
	       OUT_RING( t->regTexBaseAndPitch[j].baseL );
	       OUT_RING( t->regTexBaseAndPitch[j].pitchLog2 );
	    }
	    ADVANCE_RING_VARIABLE();
	 }
	 else {
	    BEGIN_RING(9);
	    OUT_RING( HC_HEADER2 );
	    OUT_RING( (HC_ParaType_Tex << 16) |  (texunit << 24) );
	    OUT_RING( t->regTexFM );
	    OUT_RING( (HC_SubA_HTXnL0OS << 24) |
	       ((t->lastLevel) << HC_HTXnLVmax_SHIFT) | t->firstLevel );
	    OUT_RING( t->regTexWidthLog2[0] );
	    OUT_RING( t->regTexHeightLog2[0] );
	    OUT_RING( t->regTexBaseH[0] );
	    OUT_RING( t->regTexBaseAndPitch[0].baseL );
	    OUT_RING( t->regTexBaseAndPitch[0].pitchLog2 );
	    ADVANCE_RING();
	 }

	 BEGIN_RING(14);
	 OUT_RING( (HC_SubA_HTXnTB << 24) | vmesa->regHTXnTB[1] );
	 OUT_RING( (HC_SubA_HTXnMPMD << 24) | vmesa->regHTXnMPMD[1] );
	 OUT_RING( (HC_SubA_HTXnTBLCsat << 24) | vmesa->regHTXnTBLCsat[1] );
	 OUT_RING( (HC_SubA_HTXnTBLCop << 24) | vmesa->regHTXnTBLCop[1] );
	 OUT_RING( (HC_SubA_HTXnTBLMPfog << 24) | vmesa->regHTXnTBLMPfog[1] );
	 OUT_RING( (HC_SubA_HTXnTBLAsat << 24) | vmesa->regHTXnTBLAsat[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRCb << 24) | vmesa->regHTXnTBLRCb[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRAa << 24) | vmesa->regHTXnTBLRAa[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRFog << 24) | vmesa->regHTXnTBLRFog[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRCa << 24) | vmesa->regHTXnTBLRCa[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRCc << 24) | vmesa->regHTXnTBLRCc[1] );
	 OUT_RING( (HC_SubA_HTXnTBLRCbias << 24) | vmesa->regHTXnTBLRCbias[1] );
	 OUT_RING( (HC_SubA_HTXnTBC << 24) | vmesa->regHTXnTBC[1] );
	 OUT_RING( (HC_SubA_HTXnTRAH << 24) | vmesa->regHTXnTRAH[1] );
/* 	 OUT_RING( (HC_SubA_HTXnCLODu << 24) | vmesa->regHTXnCLOD[1] ); */
	 ADVANCE_RING();

	 /* KW:  This test never succeeds:
	  */
	 if (t->regTexFM == HC_HTXnFM_Index8) {
	    const struct gl_color_table *table = &texObj->Palette;
	    const GLfloat *tableF = table->TableF;

	    BEGIN_RING(2 + table->Size);
	    OUT_RING( HC_HEADER2 );
	    OUT_RING( (HC_ParaType_Palette << 16) | (texunit << 24) );
	    for (j = 0; j < table->Size; j++) {
	       OUT_RING( tableF[j] );
	    }
	    ADVANCE_RING();
	 }

	 QWORD_PAD_RING();
      }
   }
    
#if 0
   /* Polygon stipple is broken - for certain stipple values,
    * eg. 0xf0f0f0f0, the hardware will refuse to accept the stipple.
    * Coincidentally, conform generates just such a stipple.
    */
   if (ctx->Polygon.StippleFlag) {
      GLuint *stipple = &ctx->PolygonStipple[0];
      __DRIdrawablePrivate *dPriv = vmesa->driDrawable;
      struct via_renderbuffer *const vrb = 
	(struct via_renderbuffer *) dPriv->driverPrivate;
      GLint i;
        
      BEGIN_RING(38);
      OUT_RING( HC_HEADER2 );             

      OUT_RING( ((HC_ParaType_Palette << 16) | (HC_SubType_Stipple << 24)) );
      for (i = 31; i >= 0; i--) {
	 GLint j;
	 GLuint k = 0;

	 /* Need to flip bits left to right:
	  */
	 for (j = 0 ; j < 32; j++)
	    if (stipple[i] & (1<<j))
	       k |= 1 << (31-j);

	 OUT_RING( k );     
      }

      OUT_RING( HC_HEADER2 );                     
      OUT_RING( (HC_ParaType_NotTex << 16) );
      OUT_RING( (HC_SubA_HSPXYOS << 24) );
      OUT_RING( (HC_SubA_HSPXYOS << 24) );

      ADVANCE_RING();
   }
#endif
   
   vmesa->newEmitState = 0;
}


static INLINE GLuint viaPackColor(GLuint bpp,
                                  GLubyte r, GLubyte g,
                                  GLubyte b, GLubyte a)
{
    switch (bpp) {
    case 16:
        return PACK_COLOR_565(r, g, b);
    case 32:
        return PACK_COLOR_8888(a, r, g, b);        
    default:
       assert(0);
       return 0;
   }
}

static void viaBlendEquationSeparate(GLcontext *ctx,
				     GLenum rgbMode, 
				     GLenum aMode)
{
    if (VIA_DEBUG & DEBUG_STATE) 
       fprintf(stderr, "%s in\n", __FUNCTION__);

    /* GL_EXT_blend_equation_separate not supported */
    ASSERT(rgbMode == aMode);

    /* Can only do GL_ADD equation in hardware */
    FALLBACK(VIA_CONTEXT(ctx), VIA_FALLBACK_BLEND_EQ, 
	     rgbMode != GL_FUNC_ADD_EXT);

    /* BlendEquation sets ColorLogicOpEnabled in an unexpected
     * manner.
     */
    FALLBACK(VIA_CONTEXT(ctx), VIA_FALLBACK_LOGICOP,
             (ctx->Color.ColorLogicOpEnabled &&
              ctx->Color.LogicOp != GL_COPY));
}

static void viaBlendFunc(GLcontext *ctx, GLenum sfactor, GLenum dfactor)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    GLboolean fallback = GL_FALSE;
    if (VIA_DEBUG & DEBUG_STATE) 
       fprintf(stderr, "%s in\n", __FUNCTION__);

    switch (ctx->Color.BlendSrcRGB) {
    case GL_SRC_ALPHA_SATURATE:  
    case GL_CONSTANT_COLOR:
    case GL_ONE_MINUS_CONSTANT_COLOR:
    case GL_CONSTANT_ALPHA:
    case GL_ONE_MINUS_CONSTANT_ALPHA:
        fallback = GL_TRUE;
        break;
    default:
        break;
    }

    switch (ctx->Color.BlendDstRGB) {
    case GL_CONSTANT_COLOR:
    case GL_ONE_MINUS_CONSTANT_COLOR:
    case GL_CONSTANT_ALPHA:
    case GL_ONE_MINUS_CONSTANT_ALPHA:
        fallback = GL_TRUE;
        break;
    default:
        break;
    }

    FALLBACK(vmesa, VIA_FALLBACK_BLEND_FUNC, fallback);
}

/* Shouldn't be called as the extension is disabled.
 */
static void viaBlendFuncSeparate(GLcontext *ctx, GLenum sfactorRGB,
                                 GLenum dfactorRGB, GLenum sfactorA,
                                 GLenum dfactorA)
{
    if (dfactorRGB != dfactorA || sfactorRGB != sfactorA) {
        _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendEquation (disabled)");
    }

    viaBlendFunc(ctx, sfactorRGB, dfactorRGB);
}




/* =============================================================
 * Hardware clipping
 */
static void viaScissor(GLcontext *ctx, GLint x, GLint y,
                       GLsizei w, GLsizei h)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);

    if (!vmesa->driDrawable)
       return;

    if (VIA_DEBUG & DEBUG_STATE)
       fprintf(stderr, "%s %d,%d %dx%d, drawH %d\n", __FUNCTION__, 
	       x,y,w,h, vmesa->driDrawable->h);

    if (vmesa->scissor) {
        VIA_FLUSH_DMA(vmesa); /* don't pipeline cliprect changes */
    }

    vmesa->scissorRect.x1 = x;
    vmesa->scissorRect.y1 = vmesa->driDrawable->h - y - h;
    vmesa->scissorRect.x2 = x + w;
    vmesa->scissorRect.y2 = vmesa->driDrawable->h - y;
}

static void viaEnable(GLcontext *ctx, GLenum cap, GLboolean state)
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);

   switch (cap) {
   case GL_SCISSOR_TEST:
      VIA_FLUSH_DMA(vmesa);
      vmesa->scissor = state;
      break;
   default:
      break;
   }
}



/* Fallback to swrast for select and feedback.
 */
static void viaRenderMode(GLcontext *ctx, GLenum mode)
{
    FALLBACK(VIA_CONTEXT(ctx), VIA_FALLBACK_RENDERMODE, (mode != GL_RENDER));
}


static void viaDrawBuffer(GLcontext *ctx, GLenum mode)
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);

   if (VIA_DEBUG & (DEBUG_DRI|DEBUG_STATE)) 
      fprintf(stderr, "%s in\n", __FUNCTION__);

   if (!ctx->DrawBuffer)
      return;

   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
      FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_TRUE);
      return;
   }

   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
   case BUFFER_FRONT_LEFT:
      VIA_FLUSH_DMA(vmesa);
      vmesa->drawBuffer = &vmesa->front;
      FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_FALSE);
      break;
   case BUFFER_BACK_LEFT:
      VIA_FLUSH_DMA(vmesa);
      vmesa->drawBuffer = &vmesa->back;
      FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_FALSE);
      break;
   default:
      FALLBACK(vmesa, VIA_FALLBACK_DRAW_BUFFER, GL_TRUE);
      return;
   }


   viaXMesaWindowMoved(vmesa);
}

static void viaClearColor(GLcontext *ctx, const GLfloat color[4])
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    GLubyte pcolor[4];
    CLAMPED_FLOAT_TO_UBYTE(pcolor[0], color[0]);
    CLAMPED_FLOAT_TO_UBYTE(pcolor[1], color[1]);
    CLAMPED_FLOAT_TO_UBYTE(pcolor[2], color[2]);
    CLAMPED_FLOAT_TO_UBYTE(pcolor[3], color[3]);
    vmesa->ClearColor = viaPackColor(vmesa->viaScreen->bitsPerPixel,
                                     pcolor[0], pcolor[1],
                                     pcolor[2], pcolor[3]);
}

#define WRITEMASK_ALPHA_SHIFT 31
#define WRITEMASK_RED_SHIFT   30
#define WRITEMASK_GREEN_SHIFT 29
#define WRITEMASK_BLUE_SHIFT  28

static void viaColorMask(GLcontext *ctx,
			 GLboolean r, GLboolean g,
			 GLboolean b, GLboolean a)
{
   struct via_context *vmesa = VIA_CONTEXT( ctx );

   if (VIA_DEBUG & DEBUG_STATE)
      fprintf(stderr, "%s r(%d) g(%d) b(%d) a(%d)\n", __FUNCTION__, r, g, b, a);

   vmesa->ClearMask = (((!r) << WRITEMASK_RED_SHIFT) |
		       ((!g) << WRITEMASK_GREEN_SHIFT) |
		       ((!b) << WRITEMASK_BLUE_SHIFT) |
		       ((!a) << WRITEMASK_ALPHA_SHIFT));
}



/* This hardware just isn't capable of private back buffers without
 * glitches and/or a hefty locking scheme.
 */
void viaCalcViewport(GLcontext *ctx)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    __DRIdrawablePrivate *dPriv = vmesa->driDrawable;
    struct via_renderbuffer *const vrb = 
      (struct via_renderbuffer *) dPriv->driverPrivate;
    const GLfloat *v = ctx->Viewport._WindowMap.m;
    GLfloat *m = vmesa->ViewportMatrix.m;
    
    m[MAT_SX] =   v[MAT_SX];
    m[MAT_TX] =   v[MAT_TX] + vrb->drawX + SUBPIXEL_X;
    m[MAT_SY] = - v[MAT_SY];
    m[MAT_TY] = - v[MAT_TY] + vrb->drawY + SUBPIXEL_Y + vrb->drawH;
    m[MAT_SZ] =   v[MAT_SZ] * (1.0 / vmesa->depth_max);
    m[MAT_TZ] =   v[MAT_TZ] * (1.0 / vmesa->depth_max);
}

static void viaViewport(GLcontext *ctx,
                        GLint x, GLint y,
                        GLsizei width, GLsizei height)
{
    viaCalcViewport(ctx);
}

static void viaDepthRange(GLcontext *ctx,
                          GLclampd nearval, GLclampd farval)
{
    viaCalcViewport(ctx);
}

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

    vmesa->regCmdB = HC_ACMD_HCmdB;
    vmesa->regEnable = HC_HenCW_MASK;

   /* Mesa should do this for us:
    */

   ctx->Driver.BlendEquationSeparate( ctx, 
				      ctx->Color.BlendEquationRGB,
				      ctx->Color.BlendEquationA);

   ctx->Driver.BlendFuncSeparate( ctx,
				  ctx->Color.BlendSrcRGB,
				  ctx->Color.BlendDstRGB,