r128_state.c

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

/* $XFree86: xc/lib/GL/mesa/src/drv/r128/r128_state.c,v 1.11 2002/10/30 12:51:39 alanh Exp $ */
/**************************************************************************

Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, Inc.,
                                               Cedar Park, Texas.
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"),
to deal in the Software without restriction, including without limitation
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the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
ATI, PRECISION INSIGHT AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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**************************************************************************/

/*
 * Authors:
 *   Gareth Hughes <[e-mail]>
 *   Kevin E. Martin <[e-mail]>
 *   Keith Whitwell <[e-mail]>
 *
 */

#include "r128_context.h"
#include "r128_state.h"
#include "r128_ioctl.h"
#include "r128_tris.h"
#include "r128_tex.h"

#include "context.h"
#include "enums.h"
#include "colormac.h"
#include "swrast/swrast.h"
#include "vbo/vbo.h"
#include "tnl/tnl.h"
#include "swrast_setup/swrast_setup.h"

#include "tnl/t_pipeline.h"

#include "drirenderbuffer.h"


/* =============================================================
 * Alpha blending
 */


/**
 * Calculate the hardware blend factor setting.  This same function is used
 * for source and destination of both alpha and RGB.  
 *
 * \returns
 * The hardware register value for the specified blend factor.  This value
 * will need to be shifted into the correct position for either source or
 * destination factor.
 *
 * \todo
 * Since the two cases where source and destination are handled differently
 * are essentially error cases, they should never happen.  Determine if these
 * cases can be removed.
 */
static int blend_factor( r128ContextPtr rmesa, GLenum factor, GLboolean is_src )
{
   int   func;

   switch ( factor ) {
   case GL_ZERO:
      func = R128_ALPHA_BLEND_ZERO;
      break;
   case GL_ONE:
      func = R128_ALPHA_BLEND_ONE;
      break;

   case GL_SRC_COLOR:
      func = R128_ALPHA_BLEND_SRCCOLOR;
      break;
   case GL_ONE_MINUS_SRC_COLOR:
      func = R128_ALPHA_BLEND_INVSRCCOLOR;
      break;
   case GL_SRC_ALPHA:
      func = R128_ALPHA_BLEND_SRCALPHA;
      break;
   case GL_ONE_MINUS_SRC_ALPHA:
      func = R128_ALPHA_BLEND_INVSRCALPHA;
      break;
   case GL_SRC_ALPHA_SATURATE:
      func = (is_src) ? R128_ALPHA_BLEND_SAT : R128_ALPHA_BLEND_ZERO;
      break;

   case GL_DST_COLOR:
      func = R128_ALPHA_BLEND_DSTCOLOR;
      break;
   case GL_ONE_MINUS_DST_COLOR:
      func = R128_ALPHA_BLEND_INVDSTCOLOR;
      break;
   case GL_DST_ALPHA:
      func = R128_ALPHA_BLEND_DSTALPHA;
      break;
   case GL_ONE_MINUS_DST_ALPHA:
      func = R128_ALPHA_BLEND_INVDSTALPHA;
      break;

   case GL_CONSTANT_COLOR:
   case GL_ONE_MINUS_CONSTANT_COLOR:
   case GL_CONSTANT_ALPHA:
   case GL_ONE_MINUS_CONSTANT_ALPHA:
   default:
      FALLBACK( rmesa, R128_FALLBACK_BLEND_FUNC, GL_TRUE );
      func = (is_src) ? R128_ALPHA_BLEND_ONE : R128_ALPHA_BLEND_ZERO;
      break;
   }
   
   return func;
}


static void r128UpdateAlphaMode( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint a = rmesa->setup.misc_3d_state_cntl_reg;
   GLuint t = rmesa->setup.tex_cntl_c;

   if ( ctx->Color.AlphaEnabled ) {
      GLubyte ref;

      CLAMPED_FLOAT_TO_UBYTE(ref, ctx->Color.AlphaRef);

      a &= ~(R128_ALPHA_TEST_MASK | R128_REF_ALPHA_MASK);

      switch ( ctx->Color.AlphaFunc ) {
      case GL_NEVER:
	 a |= R128_ALPHA_TEST_NEVER;
	 break;
      case GL_LESS:
	 a |= R128_ALPHA_TEST_LESS;
         break;
      case GL_LEQUAL:
	 a |= R128_ALPHA_TEST_LESSEQUAL;
	 break;
      case GL_EQUAL:
	 a |= R128_ALPHA_TEST_EQUAL;
	 break;
      case GL_GEQUAL:
	 a |= R128_ALPHA_TEST_GREATEREQUAL;
	 break;
      case GL_GREATER:
	 a |= R128_ALPHA_TEST_GREATER;
	 break;
      case GL_NOTEQUAL:
	 a |= R128_ALPHA_TEST_NEQUAL;
	 break;
      case GL_ALWAYS:
	 a |= R128_ALPHA_TEST_ALWAYS;
	 break;
      }

      a |= ref & R128_REF_ALPHA_MASK;
      t |= R128_ALPHA_TEST_ENABLE;
   } else {
      t &= ~R128_ALPHA_TEST_ENABLE;
   }

   FALLBACK( rmesa, R128_FALLBACK_BLEND_FUNC, GL_FALSE );

   if ( ctx->Color.BlendEnabled ) {
      a &= ~((R128_ALPHA_BLEND_MASK << R128_ALPHA_BLEND_SRC_SHIFT) |
	     (R128_ALPHA_BLEND_MASK << R128_ALPHA_BLEND_DST_SHIFT)
	     | R128_ALPHA_COMB_FCN_MASK);

      a |= blend_factor( rmesa, ctx->Color.BlendSrcRGB, GL_TRUE ) 
	  << R128_ALPHA_BLEND_SRC_SHIFT;
      a |= blend_factor( rmesa, ctx->Color.BlendDstRGB, GL_FALSE ) 
	  << R128_ALPHA_BLEND_DST_SHIFT;

      switch (ctx->Color.BlendEquationRGB) {
      case GL_FUNC_ADD:
	 a |= R128_ALPHA_COMB_ADD_CLAMP;
	 break;
      case GL_FUNC_SUBTRACT:
	 a |= R128_ALPHA_COMB_SUB_SRC_DST_CLAMP;
	 break;
      default:
	 FALLBACK( rmesa, R128_FALLBACK_BLEND_EQ, GL_TRUE );
      }

      t |=  R128_ALPHA_ENABLE;
   } else {
      t &= ~R128_ALPHA_ENABLE;
   }

   if ( rmesa->setup.misc_3d_state_cntl_reg != a ) {
      rmesa->setup.misc_3d_state_cntl_reg = a;
      rmesa->dirty |= R128_UPLOAD_CONTEXT | R128_UPLOAD_MASKS;
   }
   if ( rmesa->setup.tex_cntl_c != t ) {
      rmesa->setup.tex_cntl_c = t;
      rmesa->dirty |= R128_UPLOAD_CONTEXT | R128_UPLOAD_MASKS;
   }
}

static void r128DDAlphaFunc( GLcontext *ctx, GLenum func, GLfloat ref )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_ALPHA;
}

static void r128DDBlendEquationSeparate( GLcontext *ctx, 
					 GLenum modeRGB, GLenum modeA )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   assert( modeRGB == modeA );
   FLUSH_BATCH( rmesa );

   /* BlendEquation sets ColorLogicOpEnabled in an unexpected
    * manner.
    */
   FALLBACK( R128_CONTEXT(ctx), R128_FALLBACK_LOGICOP,
	     (ctx->Color.ColorLogicOpEnabled &&
	      ctx->Color.LogicOp != GL_COPY));

   /* Can only do blend addition, not min, max, subtract, etc. */
   FALLBACK( R128_CONTEXT(ctx), R128_FALLBACK_BLEND_EQ,
	     (modeRGB != GL_FUNC_ADD) && (modeRGB != GL_FUNC_SUBTRACT));

   rmesa->new_state |= R128_NEW_ALPHA;
}

static void r128DDBlendFuncSeparate( GLcontext *ctx,
				     GLenum sfactorRGB, GLenum dfactorRGB,
				     GLenum sfactorA, GLenum dfactorA )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_ALPHA;
}

/* =============================================================
 * Stencil
 */

static void
r128DDStencilFuncSeparate( GLcontext *ctx, GLenum face, GLenum func,
                           GLint ref, GLuint mask )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint refmask = (((ctx->Stencil.Ref[0] & 0xff) << 0) |
		     ((ctx->Stencil.ValueMask[0] & 0xff) << 16) |
		     ((ctx->Stencil.WriteMask[0] & 0xff) << 24)); 
   GLuint z = rmesa->setup.z_sten_cntl_c;

   z &= ~R128_STENCIL_TEST_MASK;
   switch ( ctx->Stencil.Function[0] ) {
   case GL_NEVER:
      z |= R128_STENCIL_TEST_NEVER;
      break;
   case GL_LESS:
      z |= R128_STENCIL_TEST_LESS;
      break;
   case GL_EQUAL:
      z |= R128_STENCIL_TEST_EQUAL;
      break;
   case GL_LEQUAL:
      z |= R128_STENCIL_TEST_LESSEQUAL;
      break;
   case GL_GREATER:
      z |= R128_STENCIL_TEST_GREATER;
      break;
   case GL_NOTEQUAL:
      z |= R128_STENCIL_TEST_NEQUAL;
      break;
   case GL_GEQUAL:
      z |= R128_STENCIL_TEST_GREATEREQUAL;
      break;
   case GL_ALWAYS:
      z |= R128_STENCIL_TEST_ALWAYS;
      break;
   }

   if ( rmesa->setup.sten_ref_mask_c != refmask ) {
      rmesa->setup.sten_ref_mask_c = refmask;
      rmesa->dirty |= R128_UPLOAD_MASKS;
   }
   if ( rmesa->setup.z_sten_cntl_c != z ) {
      rmesa->setup.z_sten_cntl_c = z;
      rmesa->dirty |= R128_UPLOAD_CONTEXT;
   }
}

static void
r128DDStencilMaskSeparate( GLcontext *ctx, GLenum face, GLuint mask )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint refmask = (((ctx->Stencil.Ref[0] & 0xff) << 0) |
		     ((ctx->Stencil.ValueMask[0] & 0xff) << 16) |
		     ((ctx->Stencil.WriteMask[0] & 0xff) << 24)); 

   if ( rmesa->setup.sten_ref_mask_c != refmask ) {
      rmesa->setup.sten_ref_mask_c = refmask;
      rmesa->dirty |= R128_UPLOAD_MASKS;
   }
}

static void r128DDStencilOpSeparate( GLcontext *ctx, GLenum face, GLenum fail,
                                     GLenum zfail, GLenum zpass )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint z = rmesa->setup.z_sten_cntl_c;

   if (!( ctx->Visual.stencilBits > 0 && ctx->Visual.depthBits == 24 ))
      return;

   z &= ~(R128_STENCIL_S_FAIL_MASK | R128_STENCIL_ZPASS_MASK |
	  R128_STENCIL_ZFAIL_MASK);

   switch ( ctx->Stencil.FailFunc[0] ) {
   case GL_KEEP:
      z |= R128_STENCIL_S_FAIL_KEEP;
      break;
   case GL_ZERO:
      z |= R128_STENCIL_S_FAIL_ZERO;
      break;
   case GL_REPLACE:
      z |= R128_STENCIL_S_FAIL_REPLACE;
      break;
   case GL_INCR:
      z |= R128_STENCIL_S_FAIL_INC;
      break;
   case GL_DECR:
      z |= R128_STENCIL_S_FAIL_DEC;
      break;
   case GL_INVERT:
      z |= R128_STENCIL_S_FAIL_INV;
      break;
   case GL_INCR_WRAP:
      z |= R128_STENCIL_S_FAIL_INC_WRAP;
      break;
   case GL_DECR_WRAP:
      z |= R128_STENCIL_S_FAIL_DEC_WRAP;
      break;
   }

   switch ( ctx->Stencil.ZFailFunc[0] ) {
   case GL_KEEP:
      z |= R128_STENCIL_ZFAIL_KEEP;
      break;
   case GL_ZERO:
      z |= R128_STENCIL_ZFAIL_ZERO;
      break;
   case GL_REPLACE:
      z |= R128_STENCIL_ZFAIL_REPLACE;
      break;
   case GL_INCR:
      z |= R128_STENCIL_ZFAIL_INC;
      break;
   case GL_DECR:
      z |= R128_STENCIL_ZFAIL_DEC;
      break;
   case GL_INVERT:
      z |= R128_STENCIL_ZFAIL_INV;
      break;
   case GL_INCR_WRAP:
      z |= R128_STENCIL_ZFAIL_INC_WRAP;
      break;
   case GL_DECR_WRAP:
      z |= R128_STENCIL_ZFAIL_DEC_WRAP;
      break;
   }

   switch ( ctx->Stencil.ZPassFunc[0] ) {
   case GL_KEEP:
      z |= R128_STENCIL_ZPASS_KEEP;
      break;
   case GL_ZERO:
      z |= R128_STENCIL_ZPASS_ZERO;
      break;
   case GL_REPLACE:
      z |= R128_STENCIL_ZPASS_REPLACE;
      break;
   case GL_INCR:
      z |= R128_STENCIL_ZPASS_INC;
      break;
   case GL_DECR:
      z |= R128_STENCIL_ZPASS_DEC;
      break;
   case GL_INVERT:
      z |= R128_STENCIL_ZPASS_INV;
      break;
   case GL_INCR_WRAP:
      z |= R128_STENCIL_ZPASS_INC_WRAP;
      break;
   case GL_DECR_WRAP:
      z |= R128_STENCIL_ZPASS_DEC_WRAP;
      break;
   }

   if ( rmesa->setup.z_sten_cntl_c != z ) {
      rmesa->setup.z_sten_cntl_c = z;
      rmesa->dirty |= R128_UPLOAD_CONTEXT;
   }
}

static void r128DDClearStencil( GLcontext *ctx, GLint s )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   if (ctx->Visual.stencilBits > 0 && ctx->Visual.depthBits == 24) {
      rmesa->ClearDepth &= 0x00ffffff;
      rmesa->ClearDepth |= ctx->Stencil.Clear << 24;
   }
}

/* =============================================================
 * Depth testing
 */

static void r128UpdateZMode( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint z = rmesa->setup.z_sten_cntl_c;
   GLuint t = rmesa->setup.tex_cntl_c;

   if ( ctx->Depth.Test ) {
      z &= ~R128_Z_TEST_MASK;

      switch ( ctx->Depth.Func ) {
      case GL_NEVER:
	 z |= R128_Z_TEST_NEVER;
	 break;
      case GL_ALWAYS:
	 z |= R128_Z_TEST_ALWAYS;
	 break;
      case GL_LESS:
	 z |= R128_Z_TEST_LESS;
	 break;
      case GL_LEQUAL:
	 z |= R128_Z_TEST_LESSEQUAL;
	 break;
      case GL_EQUAL:
	 z |= R128_Z_TEST_EQUAL;
	 break;
      case GL_GEQUAL:
	 z |= R128_Z_TEST_GREATEREQUAL;
	 break;
      case GL_GREATER:
	 z |= R128_Z_TEST_GREATER;
	 break;
      case GL_NOTEQUAL:
	 z |= R128_Z_TEST_NEQUAL;
	 break;
      }

      t |=  R128_Z_ENABLE;
   } else {
      t &= ~R128_Z_ENABLE;
   }

   if ( ctx->Depth.Mask ) {
      t |=  R128_Z_WRITE_ENABLE;
   } else {
      t &= ~R128_Z_WRITE_ENABLE;
   }

   if ( rmesa->setup.z_sten_cntl_c != z ) {
      rmesa->setup.z_sten_cntl_c = z;