sis_state.c

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

/**************************************************************************

Copyright 2000 Silicon Integrated Systems Corp, Inc., HsinChu, Taiwan.
Copyright 2003 Eric Anholt
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
on 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
ERIC ANHOLT OR SILICON INTEGRATED SYSTEMS CORP 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.

**************************************************************************/
/* $XFree86: xc/lib/GL/mesa/src/drv/sis/sis_ctx.c,v 1.3 2000/09/26 15:56:48 tsi Exp $ */

/*
 * Authors:
 *    Sung-Ching Lin <[e-mail]>
 *    Eric Anholt <[e-mail]>
 */

#include "sis_context.h"
#include "sis_state.h"
#include "sis_tris.h"
#include "sis_lock.h"
#include "sis_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"

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

static void
sisDDAlphaFunc( GLcontext * ctx, GLenum func, GLfloat ref )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   GLubyte refbyte;

   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   CLAMPED_FLOAT_TO_UBYTE(refbyte, ref);
   current->hwAlpha = refbyte << 16;

   /* Alpha Test function */
   switch (func)
   {
   case GL_NEVER:
      current->hwAlpha |= SiS_ALPHA_NEVER;
      break;
   case GL_LESS:
      current->hwAlpha |= SiS_ALPHA_LESS;
      break;
   case GL_EQUAL:
      current->hwAlpha |= SiS_ALPHA_EQUAL;
      break;
   case GL_LEQUAL:
      current->hwAlpha |= SiS_ALPHA_LEQUAL;
      break;
   case GL_GREATER:
      current->hwAlpha |= SiS_ALPHA_GREATER;
      break;
   case GL_NOTEQUAL:
      current->hwAlpha |= SiS_ALPHA_NOTEQUAL;
      break;
   case GL_GEQUAL:
      current->hwAlpha |= SiS_ALPHA_GEQUAL;
      break;
   case GL_ALWAYS:
      current->hwAlpha |= SiS_ALPHA_ALWAYS;
      break;
   }

   prev->hwAlpha = current->hwAlpha;
   smesa->GlobalFlag |= GFLAG_ALPHASETTING;
}

static void
sisDDBlendFuncSeparate( GLcontext *ctx, 
			GLenum sfactorRGB, GLenum dfactorRGB,
			GLenum sfactorA,   GLenum dfactorA )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   current->hwDstSrcBlend = 0;

   switch (dfactorRGB)
   {
   case GL_ZERO:
      current->hwDstSrcBlend |= SiS_D_ZERO;
      break;
   case GL_ONE:
      current->hwDstSrcBlend |= SiS_D_ONE;
      break;
   case GL_SRC_COLOR:
      current->hwDstSrcBlend |= SiS_D_SRC_COLOR;
      break;
   case GL_ONE_MINUS_SRC_COLOR:
      current->hwDstSrcBlend |= SiS_D_ONE_MINUS_SRC_COLOR;
      break;
   case GL_SRC_ALPHA:
      current->hwDstSrcBlend |= SiS_D_SRC_ALPHA;
      break;
   case GL_ONE_MINUS_SRC_ALPHA:
      current->hwDstSrcBlend |= SiS_D_ONE_MINUS_SRC_ALPHA;
      break;
   case GL_DST_COLOR:
      current->hwDstSrcBlend |= SiS_D_DST_COLOR;
      break;
   case GL_ONE_MINUS_DST_COLOR:
      current->hwDstSrcBlend |= SiS_D_ONE_MINUS_DST_COLOR;
      break;
   case GL_DST_ALPHA:
      current->hwDstSrcBlend |= SiS_D_DST_ALPHA;
      break;
   case GL_ONE_MINUS_DST_ALPHA:
      current->hwDstSrcBlend |= SiS_D_ONE_MINUS_DST_ALPHA;
      break;
   default:
      fprintf(stderr, "Unknown dst blend function 0x%x\n", dfactorRGB);
      break;
   }

   switch (sfactorRGB)
   {
   case GL_ZERO:
      current->hwDstSrcBlend |= SiS_S_ZERO;
      break;
   case GL_ONE:
      current->hwDstSrcBlend |= SiS_S_ONE;
      break;
   case GL_SRC_COLOR:
      current->hwDstSrcBlend |= SiS_S_SRC_COLOR;
      break;
   case GL_ONE_MINUS_SRC_COLOR:
      current->hwDstSrcBlend |= SiS_S_ONE_MINUS_SRC_COLOR;
      break;
   case GL_SRC_ALPHA:
      current->hwDstSrcBlend |= SiS_S_SRC_ALPHA;
      break;
   case GL_ONE_MINUS_SRC_ALPHA:
      current->hwDstSrcBlend |= SiS_S_ONE_MINUS_SRC_ALPHA;
      break;
   case GL_DST_COLOR:
      current->hwDstSrcBlend |= SiS_S_DST_COLOR;
      break;
   case GL_ONE_MINUS_DST_COLOR:
      current->hwDstSrcBlend |= SiS_S_ONE_MINUS_DST_COLOR;
      break;
   case GL_DST_ALPHA:
      current->hwDstSrcBlend |= SiS_S_DST_ALPHA;
      break;
   case GL_ONE_MINUS_DST_ALPHA:
      current->hwDstSrcBlend |= SiS_S_ONE_MINUS_DST_ALPHA;
      break;
   case GL_SRC_ALPHA_SATURATE:
      current->hwDstSrcBlend |= SiS_S_SRC_ALPHA_SATURATE;
      break;
   default:
      fprintf(stderr, "Unknown src blend function 0x%x\n", sfactorRGB);
      break;
   }

   if (current->hwDstSrcBlend != prev->hwDstSrcBlend) {
      prev->hwDstSrcBlend = current->hwDstSrcBlend;
      smesa->GlobalFlag |= GFLAG_DSTBLEND;
   }
}

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

static void
sisDDDepthFunc( GLcontext * ctx, GLenum func )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   current->hwZ &= ~MASK_ZTestMode;
   switch (func)
   {
   case GL_LESS:
      current->hwZ |= SiS_Z_COMP_S_LT_B;
      break;
   case GL_GEQUAL:
      current->hwZ |= SiS_Z_COMP_S_GE_B;
      break;
   case GL_LEQUAL:
      current->hwZ |= SiS_Z_COMP_S_LE_B;
      break;
   case GL_GREATER:
      current->hwZ |= SiS_Z_COMP_S_GT_B;
      break;
   case GL_NOTEQUAL:
      current->hwZ |= SiS_Z_COMP_S_NE_B;
      break;
   case GL_EQUAL:
      current->hwZ |= SiS_Z_COMP_S_EQ_B;
      break;
   case GL_ALWAYS:
      current->hwZ |= SiS_Z_COMP_ALWAYS;
      break;
   case GL_NEVER:
      current->hwZ |= SiS_Z_COMP_NEVER;
      break;
   }

   if (current->hwZ != prev->hwZ) {
      prev->hwZ = current->hwZ;
      smesa->GlobalFlag |= GFLAG_ZSETTING;
   }
}

void
sisDDDepthMask( GLcontext * ctx, GLboolean flag )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   if (!ctx->Depth.Test)
      flag = GL_FALSE;

   if (ctx->Visual.stencilBits) {
      if (flag || (ctx->Stencil.WriteMask[0] != 0)) {
         current->hwCapEnable |= MASK_ZWriteEnable;
         if (flag && ((ctx->Stencil.WriteMask[0] & 0xff) == 0xff)) {
	      current->hwCapEnable2 &= ~MASK_ZMaskWriteEnable;
         } else {
            current->hwCapEnable2 |= MASK_ZMaskWriteEnable;
            current->hwZMask = (ctx->Stencil.WriteMask[0] << 24) |
               ((flag) ? 0x00ffffff : 0);

            if (current->hwZMask ^ prev->hwZMask) {
               prev->hwZMask = current->hwZMask;
               smesa->GlobalFlag |= GFLAG_ZSETTING;
            }
         }
      } else {
         current->hwCapEnable &= ~MASK_ZWriteEnable;
      }
   } else {
      if (flag) {
         current->hwCapEnable |= MASK_ZWriteEnable;
         current->hwCapEnable2 &= ~MASK_ZMaskWriteEnable;
      } else {
         current->hwCapEnable &= ~MASK_ZWriteEnable;
      }
   }
}

/* =============================================================
 * Clipping
 */

void
sisUpdateClipping( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   GLint x1, y1, x2, y2;

   if (smesa->is6326) {
      /* XXX: 6326 has its own clipping for now. Should be fixed */
      sis6326UpdateClipping(ctx);
      return;
   }

   x1 = 0;
   y1 = 0;
   x2 = smesa->width - 1;
   y2 = smesa->height - 1;

   if (ctx->Scissor.Enabled) {
      if (ctx->Scissor.X > x1)
         x1 = ctx->Scissor.X;
      if (ctx->Scissor.Y > y1)
         y1 = ctx->Scissor.Y;
      if (ctx->Scissor.X + ctx->Scissor.Width - 1 < x2)
         x2 = ctx->Scissor.X + ctx->Scissor.Width - 1;
      if (ctx->Scissor.Y + ctx->Scissor.Height - 1 < y2)
         y2 = ctx->Scissor.Y + ctx->Scissor.Height - 1;
   }

   y1 = Y_FLIP(y1);
   y2 = Y_FLIP(y2);

   current->clipTopBottom = (y2 << 13) | y1;
   current->clipLeftRight = (x1 << 13) | x2;

   if ((current->clipTopBottom ^ prev->clipTopBottom) ||
       (current->clipLeftRight ^ prev->clipLeftRight))
   {
      prev->clipTopBottom = current->clipTopBottom;
      prev->clipLeftRight = current->clipLeftRight;
      smesa->GlobalFlag |= GFLAG_CLIPPING;
   }
}

static void
sisDDScissor( GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h )
{
   if (ctx->Scissor.Enabled)
      sisUpdateClipping( ctx );
}

/* =============================================================
 * Culling
 */

static void
sisUpdateCull( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   GLint cullflag, frontface;

   cullflag = ctx->Polygon.CullFaceMode;
   frontface = ctx->Polygon.FrontFace;

   smesa->AGPParseSet &= ~(MASK_PsCullDirection_CCW);
   smesa->dwPrimitiveSet &= ~(MASK_CullDirection);

   if((cullflag == GL_FRONT && frontface == GL_CCW) ||
      (cullflag == GL_BACK && frontface == GL_CW))
   {
      smesa->AGPParseSet |= MASK_PsCullDirection_CCW;
      smesa->dwPrimitiveSet |= OP_3D_CullDirection_CCW;
   }
}


static void
sisDDCullFace( GLcontext *ctx, GLenum mode )
{
   sisUpdateCull( ctx );
}

static void
sisDDFrontFace( GLcontext *ctx, GLenum mode )
{
   sisUpdateCull( ctx );
}

/* =============================================================
 * Masks
 */

static void sisDDColorMask( GLcontext *ctx,
			    GLboolean r, GLboolean g,
			    GLboolean b, GLboolean a )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   if (r && g && b && ((ctx->Visual.alphaBits == 0) || a)) {
      current->hwCapEnable2 &= ~(MASK_AlphaMaskWriteEnable |
				 MASK_ColorMaskWriteEnable);
   } else {
      current->hwCapEnable2 |= (MASK_AlphaMaskWriteEnable |
                             MASK_ColorMaskWriteEnable);

      current->hwDstMask = (r) ? smesa->redMask : 0 |
			   (g) ? smesa->greenMask : 0 |
			   (b) ? smesa->blueMask : 0 |
			   (a) ? smesa->alphaMask : 0;
   }
   
   if (current->hwDstMask != prev->hwDstMask) {
      prev->hwDstMask = current->hwDstMask;
      smesa->GlobalFlag |= GFLAG_DESTSETTING;
   }
}

/* =============================================================
 * Rendering attributes
 */

static void sisUpdateSpecular(GLcontext *ctx)
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   __GLSiSHardware *current = &smesa->current;

   if (NEED_SECONDARY_COLOR(ctx))
      current->hwCapEnable |= MASK_SpecularEnable;
   else
      current->hwCapEnable &= ~MASK_SpecularEnable;
}

static void sisDDLightModelfv(GLcontext *ctx, GLenum pname,
			      const GLfloat *param)
{
   if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
      sisUpdateSpecular(ctx);
   }
}

static void sisDDShadeModel( GLcontext *ctx, GLenum mode )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   /* Signal to sisRasterPrimitive to recalculate dwPrimitiveSet */
   smesa->hw_primitive = -1;
}