sis_state.c

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

/* =============================================================
 * Window position
 */

/* =============================================================
 * Viewport
 */

static void sisCalcViewport( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   const GLfloat *v = ctx->Viewport._WindowMap.m;
   GLfloat *m = smesa->hw_viewport;

   /* See also sis_translate_vertex.
    */
   m[MAT_SX] =   v[MAT_SX];
   m[MAT_TX] =   v[MAT_TX] + SUBPIXEL_X;
   m[MAT_SY] = - v[MAT_SY];
   m[MAT_TY] = - v[MAT_TY] + smesa->driDrawable->h + SUBPIXEL_Y;
   m[MAT_SZ] =   v[MAT_SZ] * smesa->depth_scale;
   m[MAT_TZ] =   v[MAT_TZ] * smesa->depth_scale;
}

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

static void sisDDDepthRange( GLcontext *ctx,
			     GLclampd nearval, GLclampd farval )
{
   sisCalcViewport( ctx );
}

/* =============================================================
 * Miscellaneous
 */

static void
sisDDLogicOpCode( GLcontext *ctx, GLenum opcode )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

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

   current->hwDstSet &= ~MASK_ROP2;
   switch (opcode)
   {
   case GL_CLEAR:
      current->hwDstSet |= LOP_CLEAR;
      break;
   case GL_SET:
      current->hwDstSet |= LOP_SET;
      break;
   case GL_COPY:
      current->hwDstSet |= LOP_COPY;
      break;
   case GL_COPY_INVERTED:
      current->hwDstSet |= LOP_COPY_INVERTED;
      break;
   case GL_NOOP:
      current->hwDstSet |= LOP_NOOP;
      break;
   case GL_INVERT:
      current->hwDstSet |= LOP_INVERT;
      break;
   case GL_AND:
      current->hwDstSet |= LOP_AND;
      break;
   case GL_NAND:
      current->hwDstSet |= LOP_NAND;
      break;
   case GL_OR:
      current->hwDstSet |= LOP_OR;
      break;
   case GL_NOR:
      current->hwDstSet |= LOP_NOR;
      break;
   case GL_XOR:
      current->hwDstSet |= LOP_XOR;
      break;
   case GL_EQUIV:
      current->hwDstSet |= LOP_EQUIV;
      break;
   case GL_AND_REVERSE:
      current->hwDstSet |= LOP_AND_REVERSE;
      break;
   case GL_AND_INVERTED:
      current->hwDstSet |= LOP_AND_INVERTED;
      break;
   case GL_OR_REVERSE:
      current->hwDstSet |= LOP_OR_REVERSE;
      break;
   case GL_OR_INVERTED:
      current->hwDstSet |= LOP_OR_INVERTED;
      break;
   }

   if (current->hwDstSet ^ prev->hwDstSet) {
      prev->hwDstSet = current->hwDstSet;
      smesa->GlobalFlag |= GFLAG_DESTSETTING;
   }
}

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

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

   current->hwDstSet &= ~MASK_DstBufferPitch;
   switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
   case BUFFER_FRONT_LEFT:
      FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
      current->hwOffsetDest = smesa->front.offset >> 1;
      current->hwDstSet |= smesa->front.pitch >> 2;
      break;
   case BUFFER_BACK_LEFT:
      FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_FALSE );
      current->hwOffsetDest = smesa->back.offset >> 1;
      current->hwDstSet |= smesa->back.pitch >> 2;
      break;
   default:
      FALLBACK( smesa, SIS_FALLBACK_DRAW_BUFFER, GL_TRUE );
      return;
   }

   if (current->hwDstSet != prev->hwDstSet) {
      prev->hwDstSet = current->hwDstSet;
      smesa->GlobalFlag |= GFLAG_DESTSETTING;
   }

   if (current->hwOffsetDest != prev->hwOffsetDest) {
      prev->hwOffsetDest = current->hwOffsetDest;
      smesa->GlobalFlag |= GFLAG_DESTSETTING;
   }
}

/* =============================================================
 * Polygon stipple
 */

/* =============================================================
 * Render mode
 */

/* =============================================================
 * State enable/disable
 */

static void
sisDDEnable( GLcontext * ctx, GLenum cap, GLboolean state )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   __GLSiSHardware *current = &smesa->current;

   switch (cap)
   {
   case GL_ALPHA_TEST:
      if (state)
         current->hwCapEnable |= MASK_AlphaTestEnable;
      else
         current->hwCapEnable &= ~MASK_AlphaTestEnable;
      break;
   case GL_BLEND:
      /* TODO: */
      if (state)
      /* if (state & !ctx->Color.ColorLogicOpEnabled) */
         current->hwCapEnable |= MASK_BlendEnable;
      else
         current->hwCapEnable &= ~MASK_BlendEnable;
      break;
   case GL_CULL_FACE:
      if (state)
         current->hwCapEnable |= MASK_CullEnable;
      else
         current->hwCapEnable &= ~MASK_CullEnable;
      break;
   case GL_DEPTH_TEST:
      if (state && smesa->depth.offset != 0)
         current->hwCapEnable |= MASK_ZTestEnable;
      else
         current->hwCapEnable &= ~MASK_ZTestEnable;
      sisDDDepthMask( ctx, ctx->Depth.Mask );
      break;
   case GL_DITHER:
      if (state)
         current->hwCapEnable |= MASK_DitherEnable;
      else
         current->hwCapEnable &= ~MASK_DitherEnable;
      break;
   case GL_FOG:
      if (state)
         current->hwCapEnable |= MASK_FogEnable;
      else
         current->hwCapEnable &= ~MASK_FogEnable;
      break;
   case GL_COLOR_LOGIC_OP:
      if (state)
         sisDDLogicOpCode( ctx, ctx->Color.LogicOp );
      else
         sisDDLogicOpCode( ctx, GL_COPY );
      break;
   case GL_SCISSOR_TEST:
      sisUpdateClipping( ctx );
      break;
   case GL_STENCIL_TEST:
      if (state) {
         if (smesa->zFormat != SiS_ZFORMAT_S8Z24)
            FALLBACK(smesa, SIS_FALLBACK_STENCIL, 1);
         else
            current->hwCapEnable |= (MASK_StencilTestEnable |
				     MASK_StencilWriteEnable);
      } else {
         FALLBACK(smesa, SIS_FALLBACK_STENCIL, 0);
         current->hwCapEnable &= ~(MASK_StencilTestEnable |
				   MASK_StencilWriteEnable);
      }
      break;
   case GL_LIGHTING:
   case GL_COLOR_SUM_EXT:
      sisUpdateSpecular(ctx);
      break;
   }
}


/* =============================================================
 * State initialization, management
 */

/* Called before beginning of rendering. */
void
sisUpdateHWState( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);
   __GLSiSHardware *prev = &smesa->prev;
   __GLSiSHardware *current = &smesa->current;

   /* enable setting 1 */
   if (current->hwCapEnable ^ prev->hwCapEnable) {
      prev->hwCapEnable = current->hwCapEnable;
      smesa->GlobalFlag |= GFLAG_ENABLESETTING;
   }

  /* enable setting 2 */
   if (current->hwCapEnable2 ^ prev->hwCapEnable2) {
      prev->hwCapEnable2 = current->hwCapEnable2;
      smesa->GlobalFlag |= GFLAG_ENABLESETTING2;
   }

   if (smesa->GlobalFlag & GFLAG_RENDER_STATES)
      sis_update_render_state( smesa );

   if (smesa->GlobalFlag & GFLAG_TEXTURE_STATES)
      sis_update_texture_state( smesa );
}

static void
sisDDInvalidateState( GLcontext *ctx, GLuint new_state )
{
   sisContextPtr smesa = SIS_CONTEXT(ctx);

   _swrast_InvalidateState( ctx, new_state );
   _swsetup_InvalidateState( ctx, new_state );
   _vbo_InvalidateState( ctx, new_state );
   _tnl_InvalidateState( ctx, new_state );
   smesa->NewGLState |= new_state;
}

/* Initialize the context's hardware state.
 */
void sisDDInitState( sisContextPtr smesa )
{
   __GLSiSHardware *current = &smesa->current;
   __GLSiSHardware *prev = &(smesa->prev);
   GLcontext *ctx = smesa->glCtx;

   /* add Texture Perspective Enable */
   prev->hwCapEnable = MASK_FogPerspectiveEnable | MASK_TextureCacheEnable |
      MASK_TexturePerspectiveEnable | MASK_DitherEnable;

   /*
   prev->hwCapEnable2 = 0x00aa0080;
   */
   /* if multi-texture enabled, disable Z pre-test */
   prev->hwCapEnable2 = MASK_TextureMipmapBiasEnable;

   /* Z test mode is LESS */
   prev->hwZ = SiS_Z_COMP_S_LT_B;

   /* Depth mask */
   prev->hwZMask = 0xffffffff;

   /* Alpha test mode is ALWAYS, alpha ref value is 0 */
   prev->hwAlpha = SiS_ALPHA_ALWAYS;

   /* ROP2 is COPYPEN */
   prev->hwDstSet = LOP_COPY;

   /* color mask */
   prev->hwDstMask = 0xffffffff;

   /* LinePattern is 0, Repeat Factor is 0 */
   prev->hwLinePattern = 0x00008000;

   /* Src blend is BLEND_ONE, Dst blend is D3DBLEND_ZERO */
   prev->hwDstSrcBlend = SiS_S_ONE | SiS_D_ZERO;

   /* Stenciling disabled, function ALWAYS, ref value zero, mask all ones */
   prev->hwStSetting = STENCIL_FORMAT_8 | SiS_STENCIL_ALWAYS | 0xff;
   /* Op is KEEP for all three operations */
   prev->hwStSetting2 = SiS_SFAIL_KEEP | SiS_SPASS_ZFAIL_KEEP | 
      SiS_SPASS_ZPASS_KEEP;

   /* Texture mapping mode is Tile */
#if 0
   prev->texture[0].hwTextureSet = 0x00030000;
#endif
   /* Magnified & minified texture filter is NEAREST */
#if 0
   prev->texture[0].hwTextureMip = 0;
#endif

   /* Texture Blending setting -- use fragment color/alpha*/
   prev->hwTexBlendColor0 = STAGE0_C_CF;
   prev->hwTexBlendColor1 = STAGE1_C_CF;
   prev->hwTexBlendAlpha0 = STAGE0_A_AF;
   prev->hwTexBlendAlpha1 = STAGE1_A_AF;
   
   switch (smesa->bytesPerPixel)
   {
   case 2:
      prev->hwDstSet |= DST_FORMAT_RGB_565;
      break;
   case 4:
      prev->hwDstSet |= DST_FORMAT_ARGB_8888;
      break;
   }

   switch (ctx->Visual.depthBits)
   {
   case 0:
      prev->hwCapEnable &= ~MASK_ZWriteEnable;
   case 16:
      smesa->zFormat = SiS_ZFORMAT_Z16;
      prev->hwCapEnable |= MASK_ZWriteEnable;
      smesa->depth_scale = 1.0 / (GLfloat)0xffff;
      break;
   case 32:
      smesa->zFormat = SiS_ZFORMAT_Z32;
      prev->hwCapEnable |= MASK_ZWriteEnable;
      smesa->depth_scale = 1.0 / (GLfloat)0xffffffff;
      break;
   case 24:
      assert (ctx->Visual.stencilBits);
      smesa->zFormat = SiS_ZFORMAT_S8Z24;
      prev->hwCapEnable |= MASK_StencilBufferEnable;
      prev->hwCapEnable |= MASK_ZWriteEnable;
      smesa->depth_scale = 1.0 / (GLfloat)0xffffff;
      break;
   }

   prev->hwZ |= smesa->zFormat;

   /* TODO: need to clear cache? */
   smesa->clearTexCache = GL_TRUE;

   smesa->clearColorPattern = 0;

   smesa->AGPParseSet = MASK_PsTexture1FromB | MASK_PsBumpTextureFromC;
   smesa->dwPrimitiveSet = OP_3D_Texture1FromB | OP_3D_TextureBumpFromC;

   sisUpdateZStencilPattern( smesa, 1.0, 0 );
   sisUpdateCull( ctx );

   memcpy( current, prev, sizeof (__GLSiSHardware) );

   /* Set initial fog settings. Start and end are the same case.  */
   sisDDFogfv( ctx, GL_FOG_DENSITY, &ctx->Fog.Density );
   sisDDFogfv( ctx, GL_FOG_END, &ctx->Fog.End );
   sisDDFogfv( ctx, GL_FOG_COORDINATE_SOURCE_EXT, NULL );
   sisDDFogfv( ctx, GL_FOG_MODE, NULL );
}

/* Initialize the driver's state functions.
 */
void sisDDInitStateFuncs( GLcontext *ctx )
{
   ctx->Driver.UpdateState	 = sisDDInvalidateState;

   ctx->Driver.Clear		 = sisDDClear;
   ctx->Driver.ClearColor	 = sisDDClearColor;
   ctx->Driver.ClearDepth	 = sisDDClearDepth;
   ctx->Driver.ClearStencil	 = sisDDClearStencil;

   ctx->Driver.AlphaFunc	 = sisDDAlphaFunc;
   ctx->Driver.BlendFuncSeparate = sisDDBlendFuncSeparate;
   ctx->Driver.ColorMask	 = sisDDColorMask;
   ctx->Driver.CullFace		 = sisDDCullFace;
   ctx->Driver.DepthMask	 = sisDDDepthMask;
   ctx->Driver.DepthFunc	 = sisDDDepthFunc;
   ctx->Driver.DepthRange	 = sisDDDepthRange;
   ctx->Driver.DrawBuffer	 = sisDDDrawBuffer;
   ctx->Driver.Enable		 = sisDDEnable;
   ctx->Driver.FrontFace	 = sisDDFrontFace;
   ctx->Driver.Fogfv		 = sisDDFogfv;
   ctx->Driver.Hint		 = NULL;
   ctx->Driver.Lightfv		 = NULL;
   ctx->Driver.LogicOpcode	 = sisDDLogicOpCode;
   ctx->Driver.PolygonMode	 = NULL;
   ctx->Driver.PolygonStipple	 = NULL;
   ctx->Driver.ReadBuffer	 = NULL;
   ctx->Driver.RenderMode	 = NULL;
   ctx->Driver.Scissor		 = sisDDScissor;
   ctx->Driver.ShadeModel	 = sisDDShadeModel;
   ctx->Driver.LightModelfv	 = sisDDLightModelfv;
   ctx->Driver.Viewport		 = sisDDViewport;

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