mgastate.c

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

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/**
 * The MGA supports a subset of possible 4x4 stipples natively, GL
 * wants 32x32.  Fortunately stipple is usually a repeating pattern.
 *
 * \param ctx GL rendering context to be affected
 * \param mask Pointer to the 32x32 stipple mask
 */

static void mgaDDPolygonStipple( GLcontext *ctx, const GLubyte *mask )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   const GLubyte *m = mask;
   GLubyte p[4];
   int i,j,k;
   int active = (ctx->Polygon.StippleFlag && 
		 mmesa->raster_primitive == GL_TRIANGLES);
   GLuint stipple;

   FLUSH_BATCH(mmesa);
   mmesa->haveHwStipple = 0;

   if (active) {
      mmesa->dirty |= MGA_UPLOAD_CONTEXT;
      mmesa->setup.dwgctl &= ~(0xf<<20);
   }

   p[0] = mask[0] & 0xf; p[0] |= p[0] << 4;
   p[1] = mask[4] & 0xf; p[1] |= p[1] << 4;
   p[2] = mask[8] & 0xf; p[2] |= p[2] << 4;
   p[3] = mask[12] & 0xf; p[3] |= p[3] << 4;

   for (k = 0 ; k < 8 ; k++)
      for (j = 0 ; j < 4; j++)
	 for (i = 0 ; i < 4 ; i++)
	    if (*m++ != p[j]) {
	       return;
	    }

   stipple = ( ((p[0] & 0xf) << 0) |
	       ((p[1] & 0xf) << 4) |
	       ((p[2] & 0xf) << 8) |
	       ((p[3] & 0xf) << 12) );

   for (i = 0 ; i < 16 ; i++)
      if (mgaStipples[i] == stipple) {
	 mmesa->poly_stipple = i<<20;
	 mmesa->haveHwStipple = 1;
	 break;
      }
   
   if (active) {
      mmesa->setup.dwgctl &= ~(0xf<<20);
      mmesa->setup.dwgctl |= mmesa->poly_stipple;
   }
}


/* =============================================================
 * Rendering attributes
 *
 * We really don't want to recalculate all this every time we bind a
 * texture.  These things shouldn't change all that often, so it makes
 * sense to break them out of the core texture state update routines.
 */

static void updateSpecularLighting( GLcontext *ctx )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   unsigned int specen;

   specen = NEED_SECONDARY_COLOR(ctx) ? TMC_specen_enable : 0;

   if ( specen != mmesa->hw.specen ) {
      mmesa->hw.specen = specen;
      mmesa->dirty |= MGA_UPLOAD_TEX0 | MGA_UPLOAD_TEX1;
   }
}


/* =============================================================
 * Materials
 */


static void mgaDDLightModelfv(GLcontext *ctx, GLenum pname,
			      const GLfloat *param)
{
   if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
      FLUSH_BATCH( MGA_CONTEXT(ctx) );
      updateSpecularLighting( ctx );
   }
}


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


static void
mgaDDStencilFuncSeparate(GLcontext *ctx, GLenum face, GLenum func, GLint ref,
                         GLuint mask)
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLuint  stencil;
   GLuint  stencilctl;

   stencil = MGA_FIELD( S_sref, ref ) | MGA_FIELD( S_smsk, mask );
   switch (func)
   {
   case GL_NEVER:
      stencilctl = SC_smode_snever;
      break;
   case GL_LESS:
      stencilctl = SC_smode_slt;
      break;
   case GL_LEQUAL:
      stencilctl = SC_smode_slte;
      break;
   case GL_GREATER:
      stencilctl = SC_smode_sgt;
      break;
   case GL_GEQUAL:
      stencilctl = SC_smode_sgte;
      break;
   case GL_NOTEQUAL:
      stencilctl = SC_smode_sne;
      break;
   case GL_EQUAL:
      stencilctl = SC_smode_se;
      break;
   case GL_ALWAYS:
   default:
      stencilctl = SC_smode_salways;
      break;
   }

   MGA_STATECHANGE( mmesa, MGA_UPLOAD_CONTEXT );
   mmesa->hw.stencil &= (S_sref_MASK & S_smsk_MASK);
   mmesa->hw.stencil |= stencil;
   mmesa->hw.stencilctl &= SC_smode_MASK;
   mmesa->hw.stencilctl |= stencilctl;
}

static void
mgaDDStencilMaskSeparate(GLcontext *ctx, GLenum face, GLuint mask)
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   MGA_STATECHANGE( mmesa, MGA_UPLOAD_CONTEXT );
   mmesa->hw.stencil &= S_swtmsk_MASK;
   mmesa->hw.stencil |= MGA_FIELD( S_swtmsk, mask );
}

static void
mgaDDStencilOpSeparate(GLcontext *ctx, GLenum face, GLenum fail, GLenum zfail,
                       GLenum zpass)
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLuint  stencilctl;

   stencilctl = 0;
   switch (ctx->Stencil.FailFunc[0])
   {
   case GL_KEEP:
      stencilctl |= SC_sfailop_keep;
      break;
   case GL_ZERO:
      stencilctl |= SC_sfailop_zero;
      break;
   case GL_REPLACE:
      stencilctl |= SC_sfailop_replace;
      break;
   case GL_INCR:
      stencilctl |= SC_sfailop_incrsat;
      break;
   case GL_DECR:
      stencilctl |= SC_sfailop_decrsat;
      break;
   case GL_INCR_WRAP:
      stencilctl |= SC_sfailop_incr;
      break;
   case GL_DECR_WRAP:
      stencilctl |= SC_sfailop_decr;
      break;
   case GL_INVERT:
      stencilctl |= SC_sfailop_invert;
      break;
   default:
      break;
   }

   switch (ctx->Stencil.ZFailFunc[0])
   {
   case GL_KEEP:
      stencilctl |= SC_szfailop_keep;
      break;
   case GL_ZERO:
      stencilctl |= SC_szfailop_zero;
      break;
   case GL_REPLACE:
      stencilctl |= SC_szfailop_replace;
      break;
   case GL_INCR:
      stencilctl |= SC_szfailop_incrsat;
      break;
   case GL_DECR:
      stencilctl |= SC_szfailop_decrsat;
      break;
   case GL_INCR_WRAP:
      stencilctl |= SC_szfailop_incr;
      break;
   case GL_DECR_WRAP:
      stencilctl |= SC_szfailop_decr;
      break;
   case GL_INVERT:
      stencilctl |= SC_szfailop_invert;
      break;
   default:
      break;
   }

   switch (ctx->Stencil.ZPassFunc[0])
   {
   case GL_KEEP:
      stencilctl |= SC_szpassop_keep;
      break;
   case GL_ZERO:
      stencilctl |= SC_szpassop_zero;
      break;
   case GL_REPLACE:
      stencilctl |= SC_szpassop_replace;
      break;
   case GL_INCR:
      stencilctl |= SC_szpassop_incrsat;
      break;
   case GL_DECR:
      stencilctl |= SC_szpassop_decrsat;
      break;
   case GL_INCR_WRAP:
      stencilctl |= SC_szpassop_incr;
      break;
   case GL_DECR_WRAP:
      stencilctl |= SC_szpassop_decr;
      break;
   case GL_INVERT:
      stencilctl |= SC_szpassop_invert;
      break;
   default:
      break;
   }

   MGA_STATECHANGE( mmesa, MGA_UPLOAD_CONTEXT );
   mmesa->hw.stencilctl &= (SC_sfailop_MASK & SC_szfailop_MASK 
			    & SC_szpassop_MASK);
   mmesa->hw.stencilctl |= stencilctl;
}


/* =============================================================
 * Window position and viewport transformation
 */

void mgaCalcViewport( GLcontext *ctx )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   const GLfloat *v = ctx->Viewport._WindowMap.m;
   GLfloat *m = mmesa->hw_viewport;

   /* See also mga_translate_vertex.
    */
   m[MAT_SX] =   v[MAT_SX];
   m[MAT_TX] =   v[MAT_TX] + mmesa->drawX + SUBPIXEL_X;
   m[MAT_SY] = - v[MAT_SY];
   m[MAT_TY] = - v[MAT_TY] + mmesa->driDrawable->h + mmesa->drawY + SUBPIXEL_Y;
   m[MAT_SZ] =   v[MAT_SZ] * mmesa->depth_scale;
   m[MAT_TZ] =   v[MAT_TZ] * mmesa->depth_scale;

   mmesa->SetupNewInputs = ~0;
}

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

static void mgaDepthRange( GLcontext *ctx, 
			    GLclampd nearval, GLclampd farval )
{
   mgaCalcViewport( ctx );
}


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

static void mgaDDClearColor(GLcontext *ctx, 
			    const GLfloat color[4] )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLubyte c[4];
   CLAMPED_FLOAT_TO_UBYTE(c[0], color[0]);
   CLAMPED_FLOAT_TO_UBYTE(c[1], color[1]);
   CLAMPED_FLOAT_TO_UBYTE(c[2], color[2]);
   CLAMPED_FLOAT_TO_UBYTE(c[3], color[3]);

   mmesa->ClearColor = mgaPackColor( mmesa->mgaScreen->cpp,
				     c[0], c[1], c[2], c[3]);
}


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


static void mgaDDLogicOp( GLcontext *ctx, GLenum opcode )
{
   mgaContextPtr mmesa = MGA_CONTEXT( ctx );

   MGA_STATECHANGE( mmesa, MGA_UPLOAD_CONTEXT );
   mmesa->hw.rop = mgarop_NoBLK[ opcode & 0x0f ];
}


static void mga_set_cliprects(mgaContextPtr mmesa)
{
   __DRIdrawablePrivate *driDrawable = mmesa->driDrawable;

   if ((mmesa->draw_buffer != MGA_FRONT)
       || (driDrawable->numBackClipRects == 0)) {
      if (driDrawable->numClipRects == 0) {
	  static drm_clip_rect_t zeroareacliprect = {0,0,0,0};
	  mmesa->numClipRects = 1;
	  mmesa->pClipRects = &zeroareacliprect;
      } else {
	  mmesa->numClipRects = driDrawable->numClipRects;
	  mmesa->pClipRects = driDrawable->pClipRects;
      }
      mmesa->drawX = driDrawable->x;
      mmesa->drawY = driDrawable->y;
   } else {
      mmesa->numClipRects = driDrawable->numBackClipRects;
      mmesa->pClipRects = driDrawable->pBackClipRects;
      mmesa->drawX = driDrawable->backX;
      mmesa->drawY = driDrawable->backY;
   }

   mmesa->setup.dstorg = mmesa->drawOffset;
   mmesa->dirty |= MGA_UPLOAD_CONTEXT | MGA_UPLOAD_CLIPRECTS;
}


void mgaUpdateRects( mgaContextPtr mmesa, GLuint buffers )
{
   __DRIdrawablePrivate *const driDrawable = mmesa->driDrawable;
   __DRIdrawablePrivate *const driReadable = mmesa->driReadable;

   mmesa->dirty_cliprects = 0;	

   driUpdateFramebufferSize(mmesa->glCtx, driDrawable);
   if (driDrawable != driReadable) {
      driUpdateFramebufferSize(mmesa->glCtx, driReadable);
   }

   mga_set_cliprects(mmesa);

   mgaUpdateClipping( mmesa->glCtx );
   mgaCalcViewport( mmesa->glCtx );
}


static void mgaDDDrawBuffer(GLcontext *ctx, GLenum mode )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   FLUSH_BATCH( mmesa );

   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {