r128_state.c

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

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

static void r128DDDepthFunc( GLcontext *ctx, GLenum func )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_DEPTH;
}

static void r128DDDepthMask( GLcontext *ctx, GLboolean flag )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_DEPTH;
}

static void r128DDClearDepth( GLcontext *ctx, GLclampd d )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   switch ( rmesa->setup.z_sten_cntl_c &  R128_Z_PIX_WIDTH_MASK ) {
   case R128_Z_PIX_WIDTH_16:
      rmesa->ClearDepth = d * 0x0000ffff;
      break;
   case R128_Z_PIX_WIDTH_24:
      rmesa->ClearDepth = d * 0x00ffffff;
      rmesa->ClearDepth |= ctx->Stencil.Clear << 24;
      break;
   case R128_Z_PIX_WIDTH_32:
      rmesa->ClearDepth = d * 0xffffffff;
      break;
   }
}


/* =============================================================
 * Fog
 */

static void r128UpdateFogAttrib( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint t = rmesa->setup.tex_cntl_c;
   GLubyte c[4];
   GLuint col;

   if ( ctx->Fog.Enabled ) {
      t |=  R128_FOG_ENABLE;
   } else {
      t &= ~R128_FOG_ENABLE;
   }

   c[0] = FLOAT_TO_UBYTE( ctx->Fog.Color[0] );
   c[1] = FLOAT_TO_UBYTE( ctx->Fog.Color[1] );
   c[2] = FLOAT_TO_UBYTE( ctx->Fog.Color[2] );

   col = r128PackColor( 4, c[0], c[1], c[2], 0 );

   if ( rmesa->setup.fog_color_c != col ) {
      rmesa->setup.fog_color_c = col;
      rmesa->dirty |= R128_UPLOAD_CONTEXT;
   }
   if ( rmesa->setup.tex_cntl_c != t ) {
      rmesa->setup.tex_cntl_c = t;
      rmesa->dirty |= R128_UPLOAD_CONTEXT;
   }
}

static void r128DDFogfv( GLcontext *ctx, GLenum pname, const GLfloat *param )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_FOG;
}


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

static void r128UpdateClipping( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   if ( rmesa->driDrawable ) {
      __DRIdrawablePrivate *drawable = rmesa->driDrawable;
      int x1 = 0;
      int y1 = 0;
      int x2 = drawable->w - 1;
      int y2 = drawable->h - 1;

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

      x1 += drawable->x;
      y1 += drawable->y;
      x2 += drawable->x;
      y2 += drawable->y;

      /* Clamp values to screen to avoid wrapping problems */
      if ( x1 < 0 )
         x1 = 0;
      else if ( x1 >= rmesa->driScreen->fbWidth )
         x1 = rmesa->driScreen->fbWidth - 1;
      if ( y1 < 0 )
         y1 = 0;
      else if ( y1 >= rmesa->driScreen->fbHeight )
         y1 = rmesa->driScreen->fbHeight - 1;
      if ( x2 < 0 )
         x2 = 0;
      else if ( x2 >= rmesa->driScreen->fbWidth )
         x2 = rmesa->driScreen->fbWidth - 1;
      if ( y2 < 0 )
         y2 = 0;
      else if ( y2 >= rmesa->driScreen->fbHeight )
         y2 = rmesa->driScreen->fbHeight - 1;

      rmesa->setup.sc_top_left_c     = (((y1 & 0x3FFF) << 16) | (x1 & 0x3FFF));
      rmesa->setup.sc_bottom_right_c = (((y2 & 0x3FFF) << 16) | (x2 & 0x3FFF));

      rmesa->dirty |= R128_UPLOAD_CONTEXT;
   }
}

static void r128DDScissor( GLcontext *ctx,
			   GLint x, GLint y, GLsizei w, GLsizei h )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_CLIP;
}


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

static void r128UpdateCull( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint f = rmesa->setup.pm4_vc_fpu_setup;

   f &= ~R128_FRONT_DIR_MASK;

   switch ( ctx->Polygon.FrontFace ) {
   case GL_CW:
      f |= R128_FRONT_DIR_CW;
      break;
   case GL_CCW:
      f |= R128_FRONT_DIR_CCW;
      break;
   }

   f |= R128_BACKFACE_SOLID | R128_FRONTFACE_SOLID;

   if ( ctx->Polygon.CullFlag ) {
      switch ( ctx->Polygon.CullFaceMode ) {
      case GL_FRONT:
	 f &= ~R128_FRONTFACE_SOLID;
	 break;
      case GL_BACK:
	 f &= ~R128_BACKFACE_SOLID;
	 break;
      case GL_FRONT_AND_BACK:
	 f &= ~(R128_BACKFACE_SOLID |
		R128_FRONTFACE_SOLID);
	 break;
      }
   }

   if ( 1 || rmesa->setup.pm4_vc_fpu_setup != f ) {
      rmesa->setup.pm4_vc_fpu_setup = f;
      rmesa->dirty |= R128_UPLOAD_CONTEXT | R128_UPLOAD_SETUP;
   }
}

static void r128DDCullFace( GLcontext *ctx, GLenum mode )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_CULL;
}

static void r128DDFrontFace( GLcontext *ctx, GLenum mode )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_CULL;
}


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

static void r128UpdateMasks( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   GLuint mask = r128PackColor( rmesa->r128Screen->cpp,
				ctx->Color.ColorMask[RCOMP],
				ctx->Color.ColorMask[GCOMP],
				ctx->Color.ColorMask[BCOMP],
				ctx->Color.ColorMask[ACOMP] );

   if ( rmesa->setup.plane_3d_mask_c != mask ) {
      rmesa->setup.plane_3d_mask_c = mask;
      rmesa->dirty |= R128_UPLOAD_CONTEXT | R128_UPLOAD_MASKS;
   }
}

static void r128DDColorMask( GLcontext *ctx,
			     GLboolean r, GLboolean g,
			     GLboolean b, GLboolean a )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );
   rmesa->new_state |= R128_NEW_MASKS;
}


/* =============================================================
 * 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 )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint t = rmesa->setup.tex_cntl_c;

   if ( NEED_SECONDARY_COLOR( ctx ) ) {
      if (ctx->Light.ShadeModel == GL_FLAT) {
         /* R128 can't do flat-shaded separate specular */
         t &= ~R128_SPEC_LIGHT_ENABLE;
         FALLBACK( rmesa, R128_FALLBACK_SEP_SPECULAR, GL_TRUE );
      }
      else {
         t |= R128_SPEC_LIGHT_ENABLE;
         FALLBACK( rmesa, R128_FALLBACK_SEP_SPECULAR, GL_FALSE );
      }
   }
   else {
      t &= ~R128_SPEC_LIGHT_ENABLE;
      FALLBACK( rmesa, R128_FALLBACK_SEP_SPECULAR, GL_FALSE );
   }

   if ( rmesa->setup.tex_cntl_c != t ) {
      rmesa->setup.tex_cntl_c = t;
      rmesa->dirty |= R128_UPLOAD_CONTEXT;
      rmesa->dirty |= R128_UPLOAD_SETUP;
      rmesa->new_state |= R128_NEW_CONTEXT;
   }
}


static void r128DDLightModelfv( GLcontext *ctx, GLenum pname,
				const GLfloat *param )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   if ( pname == GL_LIGHT_MODEL_COLOR_CONTROL ) {
      FLUSH_BATCH( rmesa );
      updateSpecularLighting(ctx);
   }
}

static void r128DDShadeModel( GLcontext *ctx, GLenum mode )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint s = rmesa->setup.pm4_vc_fpu_setup;

   s &= ~R128_FPU_COLOR_MASK;

   switch ( mode ) {
   case GL_FLAT:
      s |= R128_FPU_COLOR_FLAT;
      break;
   case GL_SMOOTH:
      s |= R128_FPU_COLOR_GOURAUD;
      break;
   default:
      return;
   }

   updateSpecularLighting(ctx);

   if ( rmesa->setup.pm4_vc_fpu_setup != s ) {
      FLUSH_BATCH( rmesa );
      rmesa->setup.pm4_vc_fpu_setup = s;

      rmesa->new_state |= R128_NEW_CONTEXT;
      rmesa->dirty |= R128_UPLOAD_SETUP;
   }
}


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

static void r128UpdateWindow( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   int x = rmesa->driDrawable->x;
   int y = rmesa->driDrawable->y;
   struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
   driRenderbuffer *drb = (driRenderbuffer *) rb;

   rmesa->setup.window_xy_offset = (((y & 0xFFF) << R128_WINDOW_Y_SHIFT) |
				    ((x & 0xFFF) << R128_WINDOW_X_SHIFT));

   rmesa->setup.dst_pitch_offset_c = (((drb->flippedPitch/8) << 21) |
                                      (drb->flippedOffset >> 5));


   rmesa->dirty |= R128_UPLOAD_CONTEXT | R128_UPLOAD_WINDOW;
}


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

static void r128CalcViewport( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const GLfloat *v = ctx->Viewport._WindowMap.m;
   GLfloat *m = rmesa->hw_viewport;

   /* See also r128_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] + rmesa->driDrawable->h + SUBPIXEL_Y;
   m[MAT_SZ] =   v[MAT_SZ] * rmesa->depth_scale;
   m[MAT_TZ] =   v[MAT_TZ] * rmesa->depth_scale;
}

static void r128Viewport( GLcontext *ctx,
			  GLint x, GLint y,
			  GLsizei width, GLsizei height )
{
   r128CalcViewport( ctx );
}

static void r128DepthRange( GLcontext *ctx,
			    GLclampd nearval, GLclampd farval )
{
   r128CalcViewport( ctx );
}


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

static void r128DDClearColor( GLcontext *ctx,
			      const GLfloat color[4] )
{
   r128ContextPtr rmesa = R128_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]);

   rmesa->ClearColor = r128PackColor( rmesa->r128Screen->cpp,
				      c[0], c[1], c[2], c[3] );
}

static void r128DDLogicOpCode( GLcontext *ctx, GLenum opcode )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   if ( ctx->Color.ColorLogicOpEnabled ) {
      FLUSH_BATCH( rmesa );

      FALLBACK( rmesa, R128_FALLBACK_LOGICOP, opcode != GL_COPY );
   }
}

static void r128DDDrawBuffer( GLcontext *ctx, GLenum mode )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );

   if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
      /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
      FALLBACK( rmesa, R128_FALLBACK_DRAW_BUFFER, GL_TRUE );
      return;
   }
   else {
      switch ( ctx->DrawBuffer->_ColorDrawBufferIndexes[0] ) {
      case BUFFER_FRONT_LEFT:
      case BUFFER_BACK_LEFT:
         FALLBACK( rmesa, R128_FALLBACK_DRAW_BUFFER, GL_FALSE );
         break;
      default:
         /* GL_NONE or GL_FRONT_AND_BACK or stereo left&right, etc */
         FALLBACK( rmesa, R128_FALLBACK_DRAW_BUFFER, GL_TRUE );
         break;
      }
   }

   rmesa->new_state |= R128_NEW_WINDOW;
}

static void r128DDReadBuffer( GLcontext *ctx, GLenum mode )
{
   /* nothing, until we implement h/w glRead/CopyPixels or CopyTexImage */
}


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

static void r128DDPolygonStipple( GLcontext *ctx, const GLubyte *mask )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLuint stipple[32], i;
   drm_r128_stipple_t stippleRec;

   for (i = 0; i < 32; i++) {
      stipple[31 - i] = ((mask[i*4+0] << 24) |
                         (mask[i*4+1] << 16) |
                         (mask[i*4+2] << 8)  |
                         (mask[i*4+3]));
   }

   FLUSH_BATCH( rmesa );
   LOCK_HARDWARE( rmesa );

   stippleRec.mask = stipple;
   drmCommandWrite( rmesa->driFd, DRM_R128_STIPPLE, 
                    &stippleRec, sizeof(stippleRec) );

   UNLOCK_HARDWARE( rmesa );

   rmesa->new_state |= R128_NEW_CONTEXT;
   rmesa->dirty |= R128_UPLOAD_CONTEXT;
}


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

static void r128DDRenderMode( GLcontext *ctx, GLenum mode )