i830_state.c

mesa-6.5-minigui源码

/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, 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 the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom 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 TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/


#include "glheader.h"
#include "context.h"
#include "macros.h"
#include "enums.h"
#include "dd.h"

#include "texmem.h"

#include "intel_screen.h"
#include "intel_batchbuffer.h"
#include "intel_fbo.h"

#include "i830_context.h"
#include "i830_reg.h"

static void
i830StencilFuncSeparate(GLcontext *ctx, GLenum face, GLenum func, GLint ref,
                        GLuint mask)
{
   struct i830_context *i830 = i830_context(ctx);
   int test = intel_translate_compare_func(func);

   mask = mask & 0xff;

   if (INTEL_DEBUG&DEBUG_DRI)
      fprintf(stderr, "%s : func: %s, ref : 0x%x, mask: 0x%x\n", __FUNCTION__,
	      _mesa_lookup_enum_by_nr(func), ref, mask);


   I830_STATECHANGE(i830, I830_UPLOAD_CTX);
   i830->state.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_TEST_MASK;
   i830->state.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_TEST_MASK |
					STENCIL_TEST_MASK(mask));
   i830->state.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_REF_VALUE_MASK |
					     ENABLE_STENCIL_TEST_FUNC_MASK);
   i830->state.Ctx[I830_CTXREG_STENCILTST] |= (ENABLE_STENCIL_REF_VALUE |
					    ENABLE_STENCIL_TEST_FUNC |
					    STENCIL_REF_VALUE(ref) |
					    STENCIL_TEST_FUNC(test));
}

static void
i830StencilMaskSeparate(GLcontext *ctx, GLenum face, GLuint mask)
{
   struct i830_context *i830 = i830_context(ctx);

   if (INTEL_DEBUG&DEBUG_DRI)
      fprintf(stderr, "%s : mask 0x%x\n", __FUNCTION__, mask);

   mask = mask & 0xff;

   I830_STATECHANGE(i830, I830_UPLOAD_CTX);
   i830->state.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_WRITE_MASK;
   i830->state.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_WRITE_MASK |
					STENCIL_WRITE_MASK(mask));
}

static void
i830StencilOpSeparate(GLcontext *ctx, GLenum face, GLenum fail, GLenum zfail,
                      GLenum zpass)
{
   struct i830_context *i830 = i830_context(ctx);
   int fop, dfop, dpop;

   if (INTEL_DEBUG&DEBUG_DRI)
      fprintf(stderr, "%s: fail : %s, zfail: %s, zpass : %s\n", __FUNCTION__,
	      _mesa_lookup_enum_by_nr(fail),
	      _mesa_lookup_enum_by_nr(zfail),
	      _mesa_lookup_enum_by_nr(zpass));

   fop = 0; dfop = 0; dpop = 0;

   switch(fail) {
   case GL_KEEP: 
      fop = STENCILOP_KEEP; 
      break;
   case GL_ZERO: 
      fop = STENCILOP_ZERO; 
      break;
   case GL_REPLACE: 
      fop = STENCILOP_REPLACE; 
      break;
   case GL_INCR: 
      fop = STENCILOP_INCRSAT;
      break;
   case GL_DECR: 
      fop = STENCILOP_DECRSAT;
      break;
   case GL_INCR_WRAP:
      fop = STENCILOP_INCR; 
      break;
   case GL_DECR_WRAP:
      fop = STENCILOP_DECR; 
      break;
   case GL_INVERT: 
      fop = STENCILOP_INVERT; 
      break;
   default: 
      break;
   }
   switch(zfail) {
   case GL_KEEP: 
      dfop = STENCILOP_KEEP; 
      break;
   case GL_ZERO: 
      dfop = STENCILOP_ZERO; 
      break;
   case GL_REPLACE: 
      dfop = STENCILOP_REPLACE; 
      break;
   case GL_INCR: 
      dfop = STENCILOP_INCRSAT;
      break;
   case GL_DECR: 
      dfop = STENCILOP_DECRSAT;
      break;
   case GL_INCR_WRAP:
      dfop = STENCILOP_INCR; 
      break;
   case GL_DECR_WRAP:
      dfop = STENCILOP_DECR; 
      break;
   case GL_INVERT: 
      dfop = STENCILOP_INVERT; 
      break;
   default: 
      break;
   }
   switch(zpass) {
   case GL_KEEP: 
      dpop = STENCILOP_KEEP; 
      break;
   case GL_ZERO: 
      dpop = STENCILOP_ZERO; 
      break;
   case GL_REPLACE: 
      dpop = STENCILOP_REPLACE; 
      break;
   case GL_INCR: 
      dpop = STENCILOP_INCRSAT;
      break;
   case GL_DECR: 
      dpop = STENCILOP_DECRSAT;
      break;
   case GL_INCR_WRAP:
      dpop = STENCILOP_INCR; 
      break;
   case GL_DECR_WRAP:
      dpop = STENCILOP_DECR; 
      break;
   case GL_INVERT: 
      dpop = STENCILOP_INVERT; 
      break;
   default: 
      break;
   }


   I830_STATECHANGE(i830, I830_UPLOAD_CTX);
   i830->state.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_OPS_MASK);
   i830->state.Ctx[I830_CTXREG_STENCILTST] |= (ENABLE_STENCIL_PARMS |
					    STENCIL_FAIL_OP(fop) |
					    STENCIL_PASS_DEPTH_FAIL_OP(dfop) |
					    STENCIL_PASS_DEPTH_PASS_OP(dpop));
}

static void i830AlphaFunc(GLcontext *ctx, GLenum func, GLfloat ref)
{
   struct i830_context *i830 = i830_context(ctx);
   int test = intel_translate_compare_func(func);
   GLubyte refByte;
   GLuint refInt;

   UNCLAMPED_FLOAT_TO_UBYTE(refByte, ref);
   refInt = (GLuint)refByte;

   I830_STATECHANGE(i830, I830_UPLOAD_CTX);
   i830->state.Ctx[I830_CTXREG_STATE2] &= ~ALPHA_TEST_REF_MASK;
   i830->state.Ctx[I830_CTXREG_STATE2] |= (ENABLE_ALPHA_TEST_FUNC |
					ENABLE_ALPHA_REF_VALUE |
					ALPHA_TEST_FUNC(test) |
					ALPHA_REF_VALUE(refInt));
}

/**
 * Makes sure that the proper enables are set for LogicOp, Independant Alpha
 * Blend, and Blending.  It needs to be called from numerous places where we
 * could change the LogicOp or Independant Alpha Blend without subsequent
 * calls to glEnable.
 * 
 * \todo
 * This function is substantially different from the old i830-specific driver.
 * I'm not sure which is correct.
 */
static void i830EvalLogicOpBlendState(GLcontext *ctx)
{
   struct i830_context *i830 = i830_context(ctx);

   I830_STATECHANGE(i830, I830_UPLOAD_CTX);

   if (ctx->Color._LogicOpEnabled) {
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~(ENABLE_COLOR_BLEND |
					       ENABLE_LOGIC_OP_MASK);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] |= (DISABLE_COLOR_BLEND |
					      ENABLE_LOGIC_OP);
   } else if (ctx->Color.BlendEnabled) {
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~(ENABLE_COLOR_BLEND |
					       ENABLE_LOGIC_OP_MASK);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] |= (ENABLE_COLOR_BLEND |
					      DISABLE_LOGIC_OP);
   } else {
      i830->state.Ctx[I830_CTXREG_ENABLES_1] &= ~(ENABLE_COLOR_BLEND |
					       ENABLE_LOGIC_OP_MASK);
      i830->state.Ctx[I830_CTXREG_ENABLES_1] |= (DISABLE_COLOR_BLEND |
					      DISABLE_LOGIC_OP);
   }
}

static void i830BlendColor(GLcontext *ctx, const GLfloat color[4])
{
   struct i830_context *i830 = i830_context(ctx);
   GLubyte r, g, b, a;

   if (INTEL_DEBUG&DEBUG_DRI)
      fprintf(stderr, "%s\n", __FUNCTION__);

   UNCLAMPED_FLOAT_TO_UBYTE(r, color[RCOMP]);
   UNCLAMPED_FLOAT_TO_UBYTE(g, color[GCOMP]);
   UNCLAMPED_FLOAT_TO_UBYTE(b, color[BCOMP]);
   UNCLAMPED_FLOAT_TO_UBYTE(a, color[ACOMP]);

   I830_STATECHANGE(i830, I830_UPLOAD_CTX);
   i830->state.Ctx[I830_CTXREG_BLENDCOLOR1] = (a<<24) | (r<<16) | (g<<8) | b;
}

/**
 * Sets both the blend equation (called "function" in i830 docs) and the
 * blend function (called "factor" in i830 docs).  This is done in a single
 * function because some blend equations (i.e., \c GL_MIN and \c GL_MAX)
 * change the interpretation of the blend function.
 */
static void i830_set_blend_state( GLcontext * ctx )
{
   struct i830_context *i830 = i830_context(ctx);
   int funcA;
   int funcRGB;
   int eqnA;
   int eqnRGB;
   int iab;
   int s1;


   funcRGB = SRC_BLND_FACT( intel_translate_blend_factor( ctx->Color.BlendSrcRGB ) )
       | DST_BLND_FACT( intel_translate_blend_factor( ctx->Color.BlendDstRGB ) );

   switch(ctx->Color.BlendEquationRGB) {
   case GL_FUNC_ADD:
      eqnRGB = BLENDFUNC_ADD; 
      break;
   case GL_MIN:
      eqnRGB = BLENDFUNC_MIN;
      funcRGB = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
      break;
   case GL_MAX: 
      eqnRGB = BLENDFUNC_MAX;
      funcRGB = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
      break;
   case GL_FUNC_SUBTRACT: 
      eqnRGB = BLENDFUNC_SUB; 
      break;
   case GL_FUNC_REVERSE_SUBTRACT:
      eqnRGB = BLENDFUNC_RVRSE_SUB; 
      break;
   default:
      fprintf( stderr, "[%s:%u] Invalid RGB blend equation (0x%04x).\n",
	       __FUNCTION__, __LINE__, ctx->Color.BlendEquationRGB );
      return;
   }


   funcA = SRC_ABLEND_FACT( intel_translate_blend_factor( ctx->Color.BlendSrcA ) )
       | DST_ABLEND_FACT( intel_translate_blend_factor( ctx->Color.BlendDstA ) );

   switch(ctx->Color.BlendEquationA) {
   case GL_FUNC_ADD:
      eqnA = BLENDFUNC_ADD; 
      break;
   case GL_MIN: 
      eqnA = BLENDFUNC_MIN;
      funcA = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
      break;
   case GL_MAX: 
      eqnA = BLENDFUNC_MAX;
      funcA = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
      break;
   case GL_FUNC_SUBTRACT: 
      eqnA = BLENDFUNC_SUB; 
      break;
   case GL_FUNC_REVERSE_SUBTRACT:
      eqnA = BLENDFUNC_RVRSE_SUB; 
      break;
   default:
      fprintf( stderr, "[%s:%u] Invalid alpha blend equation (0x%04x).\n",
	       __FUNCTION__, __LINE__, ctx->Color.BlendEquationA );
      return;
   }

   iab = eqnA | funcA
       | _3DSTATE_INDPT_ALPHA_BLEND_CMD
       | ENABLE_SRC_ABLEND_FACTOR | ENABLE_DST_ABLEND_FACTOR
       | ENABLE_ALPHA_BLENDFUNC;
   s1 = eqnRGB | funcRGB
       | _3DSTATE_MODES_1_CMD
       | ENABLE_SRC_BLND_FACTOR | ENABLE_DST_BLND_FACTOR
       | ENABLE_COLR_BLND_FUNC;

   if ( (eqnA | funcA) != (eqnRGB | funcRGB) )
      iab |= ENABLE_INDPT_ALPHA_BLEND;
   else
      iab |= DISABLE_INDPT_ALPHA_BLEND;

   if (iab != i830->state.Ctx[I830_CTXREG_IALPHAB] ||
       s1 != i830->state.Ctx[I830_CTXREG_STATE1]) {
      I830_STATECHANGE(i830, I830_UPLOAD_CTX);
      i830->state.Ctx[I830_CTXREG_IALPHAB] = iab;
      i830->state.Ctx[I830_CTXREG_STATE1] = s1;
   }

   /* This will catch a logicop blend equation.  It will also ensure
    * independant alpha blend is really in the correct state (either enabled
    * or disabled) if blending is already enabled.
    */

   i830EvalLogicOpBlendState(ctx);

   if (0) {
      fprintf(stderr, "[%s:%u] STATE1: 0x%08x IALPHAB: 0x%08x blend is %sabled\n",
	      __FUNCTION__, __LINE__,
	      i830->state.Ctx[I830_CTXREG_STATE1],
	      i830->state.Ctx[I830_CTXREG_IALPHAB],