tdfx_span.c

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

      for (; i < n; i++) {
	 const GLuint mask =
	    (stencil_size > 0) ? 0x00FFFFFF : 0xFFFFFFFF;
	 depth[i] = GET_WRAPPED_FB_DATA(&ReadParams, GLuint, x + i, y);
	 depth[i] &= mask;
      }
      READ_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
      break;
   }
   }
}


static void
tdfxDDWriteDepthPixels(GLcontext * ctx, struct gl_renderbuffer *rb,
		       GLuint n, const GLint x[], const GLint y[],
		       const void *values, const GLubyte mask[])
{
   const GLuint *depth = (const GLuint *) values;
   tdfxContextPtr fxMesa = (tdfxContextPtr) ctx->DriverCtx;
   GLint bottom = fxMesa->height + fxMesa->y_offset - 1;
   GLuint i;
   GLushort d16;
   GLuint d32;
   GLuint depth_size = fxMesa->glCtx->Visual.depthBits;
   GLuint stencil_size = fxMesa->glCtx->Visual.stencilBits;
   GrLfbInfo_t info;
   int xpos;
   int ypos;
   GrLfbInfo_t backBufferInfo;

   if (MESA_VERBOSE & VERBOSE_DRIVER) {
      fprintf(stderr, "tdfxmesa: tdfxDDWriteDepthPixels(...)\n");
   }

   switch (depth_size) {
   case 16:
      GetBackBufferInfo(fxMesa, &backBufferInfo);
      /*
       * Note that the _LOCK macro adds a curly brace,
       * and the UNLOCK macro removes it.
       */
      WRITE_FB_SPAN_LOCK(fxMesa, info,
			 GR_BUFFER_AUXBUFFER, GR_LFBWRITEMODE_ANY);
      {
	 LFBParameters ReadParams;
	 GetFbParams(fxMesa, &info, &backBufferInfo,
		     &ReadParams, sizeof(GLushort));
	 for (i = 0; i < n; i++) {
	    if ((!mask || mask[i]) && visible_pixel(fxMesa, x[i], y[i])) {
	       xpos = x[i] + fxMesa->x_offset;
	       ypos = bottom - y[i];
	       d16 = depth[i];
	       PUT_FB_DATA(&ReadParams, GLushort, xpos, ypos, d16);
	    }
	 }
      }
      WRITE_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
      break;
   case 24:
   case 32:
      GetBackBufferInfo(fxMesa, &backBufferInfo);
      /*
       * Note that the _LOCK macro adds a curly brace,
       * and the UNLOCK macro removes it.
       */
      WRITE_FB_SPAN_LOCK(fxMesa, info,
			 GR_BUFFER_AUXBUFFER, GR_LFBWRITEMODE_ANY);
      {
	 LFBParameters ReadParams;
	 GetFbParams(fxMesa, &info, &backBufferInfo,
		     &ReadParams, sizeof(GLuint));
	 for (i = 0; i < n; i++) {
	    if (!mask || mask[i]) {
	       if (visible_pixel(fxMesa, x[i], y[i])) {
		  xpos = x[i] + fxMesa->x_offset;
		  ypos = bottom - y[i];
		  if (stencil_size > 0) {
		     d32 =
			GET_FB_DATA(&ReadParams, GLuint, xpos, ypos);
		     d32 = (d32 & 0xFF000000) | (depth[i] & 0xFFFFFF);
		  }
		  else {
		     d32 = depth[i];
		  }
		  PUT_FB_DATA(&ReadParams, GLuint, xpos, ypos, d32);
	       }
	    }
	 }
      }
      WRITE_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
      break;
   }
}


static void
tdfxDDReadDepthPixels(GLcontext * ctx, struct gl_renderbuffer *rb, GLuint n,
		      const GLint x[], const GLint y[], void *values)
{
   GLuint *depth = (GLuint *) values;
   tdfxContextPtr fxMesa = (tdfxContextPtr) ctx->DriverCtx;
   GLint bottom = fxMesa->height + fxMesa->y_offset - 1;
   GLuint i;
   GLuint depth_size = fxMesa->glCtx->Visual.depthBits;
   GLushort d16;
   int xpos;
   int ypos;
   GrLfbInfo_t info;
   GLuint stencil_size;
   GrLfbInfo_t backBufferInfo;

   if (MESA_VERBOSE & VERBOSE_DRIVER) {
      fprintf(stderr, "tdfxmesa: tdfxDDReadDepthPixels(...)\n");
   }

   assert((depth_size == 16) || (depth_size == 24) || (depth_size == 32));
   switch (depth_size) {
   case 16:
      GetBackBufferInfo(fxMesa, &backBufferInfo);
      /*
       * Note that the _LOCK macro adds a curly brace,
       * and the UNLOCK macro removes it.
       */
      READ_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER);
      {
	 LFBParameters ReadParams;
	 GetFbParams(fxMesa, &info, &backBufferInfo,
		     &ReadParams, sizeof(GLushort));
	 for (i = 0; i < n; i++) {
	    /*
	     * Convert to screen coordinates.
	     */
	    xpos = x[i] + fxMesa->x_offset;
	    ypos = bottom - y[i];
	    d16 = GET_FB_DATA(&ReadParams, GLushort, xpos, ypos);
	    depth[i] = d16;
	 }
      }
      READ_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
      break;
   case 24:
   case 32:
      GetBackBufferInfo(fxMesa, &backBufferInfo);
      /*
       * Note that the _LOCK macro adds a curly brace,
       * and the UNLOCK macro removes it.
       */
      READ_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER);
      stencil_size = fxMesa->glCtx->Visual.stencilBits;
      {
	 LFBParameters ReadParams;
	 GetFbParams(fxMesa, &info, &backBufferInfo,
		     &ReadParams, sizeof(GLuint));
	 for (i = 0; i < n; i++) {
	    GLuint d32;

	    /*
	     * Convert to screen coordinates.
	     */
	    xpos = x[i] + fxMesa->x_offset;
	    ypos = bottom - y[i];
	    d32 = GET_FB_DATA(&ReadParams, GLuint, xpos, ypos);
	    if (stencil_size > 0) {
	       d32 &= 0x00FFFFFF;
	    }
	    depth[i] = d32;
	 }
      }
      READ_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
      break;
   default:
      assert(0);
   }
}

/*
 * Stencil buffer read/write functions.
 */
#define EXTRACT_S_FROM_ZS(zs) (((zs) >> 24) & 0xFF)
#define EXTRACT_Z_FROM_ZS(zs) ((zs) & 0xffffff)
#define BUILD_ZS(z, s)  (((s) << 24) | (z))

static void
write_stencil_span(GLcontext * ctx, struct gl_renderbuffer *rb,
                   GLuint n, GLint x, GLint y,
                   const void *values, const GLubyte mask[])
{
   const GLubyte *stencil = (const GLubyte *) values;
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   GrLfbInfo_t info;
   GrLfbInfo_t backBufferInfo;

   GetBackBufferInfo(fxMesa, &backBufferInfo);
   /*
    * Note that the _LOCK macro adds a curly brace,
    * and the UNLOCK macro removes it.
    */
   WRITE_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER, GR_LFBWRITEMODE_ANY);
   {
      const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
      const GLint winX = fxMesa->x_offset;
      const GLint scrX = winX + x;
      const GLint scrY = winY - y;
      LFBParameters ReadParams;
      GLubyte visMask[MAX_WIDTH];
      GLuint i;
      int wrappedPartStart;

      GetFbParams(fxMesa, &info, &backBufferInfo, &ReadParams,
		  sizeof(GLuint));
      if (ReadParams.firstWrappedX <= x) {
	 wrappedPartStart = 0;
      }
      else if (n <= (ReadParams.firstWrappedX - x)) {
	 wrappedPartStart = n;
      }
      else {
	 wrappedPartStart = (ReadParams.firstWrappedX - x);
      }
      generate_vismask(fxMesa, scrX, scrY, n, visMask);
      for (i = 0; i < wrappedPartStart; i++) {
	 if (visMask[i] && (!mask || mask[i])) {
	    GLuint z = GET_ORDINARY_FB_DATA(&ReadParams, GLuint,
					    scrX + i, scrY) & 0x00FFFFFF;
	    z |= (stencil[i] & 0xFF) << 24;
	    PUT_ORDINARY_FB_DATA(&ReadParams, GLuint, scrX + i, scrY, z);
	 }
      }
      for (; i < n; i++) {
	 if (visMask[i] && (!mask || mask[i])) {
	    GLuint z = GET_WRAPPED_FB_DATA(&ReadParams, GLuint,
					   scrX + i, scrY) & 0x00FFFFFF;
	    z |= (stencil[i] & 0xFF) << 24;
	    PUT_WRAPPED_FB_DATA(&ReadParams, GLuint, scrX + i, scrY, z);
	 }
      }
   }
   WRITE_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
}


static void
write_mono_stencil_span(GLcontext * ctx, struct gl_renderbuffer *rb,
                        GLuint n, GLint x, GLint y,
                        const void *value, const GLubyte mask[])
{
   GLbyte stencilVal = *((GLbyte *) value);
   GLbyte stencils[MAX_WIDTH];
   GLuint i;
   for (i = 0; i < n; i++)
      stencils[i] = stencilVal;
   write_stencil_span(ctx, rb, n, x, y, stencils, mask);
}


static void
read_stencil_span(GLcontext * ctx, struct gl_renderbuffer *rb,
                  GLuint n, GLint x, GLint y,
                  void *values)
{
   GLubyte *stencil = (GLubyte *) values;
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   GrLfbInfo_t info;
   GrLfbInfo_t backBufferInfo;

   GetBackBufferInfo(fxMesa, &backBufferInfo);
   /*
    * Note that the _LOCK macro adds a curly brace,
    * and the UNLOCK macro removes it.
    */
   READ_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER);
   {
      const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
      const GLint winX = fxMesa->x_offset;
      GLuint i;
      LFBParameters ReadParams;
      int wrappedPartStart;

      /*
       * Convert to screen coordinates.
       */
      x += winX;
      y = winY - y;
      GetFbParams(fxMesa, &info, &backBufferInfo, &ReadParams,
		  sizeof(GLuint));
      if (ReadParams.firstWrappedX <= x) {
	 wrappedPartStart = 0;
      }
      else if (n <= (ReadParams.firstWrappedX - x)) {
	 wrappedPartStart = n;
      }
      else {
	 wrappedPartStart = (ReadParams.firstWrappedX - x);
      }
      for (i = 0; i < wrappedPartStart; i++) {
	 stencil[i] = (GET_ORDINARY_FB_DATA(&ReadParams, GLuint,
					    x + i, y) >> 24) & 0xFF;
      }
      for (; i < n; i++) {
	 stencil[i] = (GET_WRAPPED_FB_DATA(&ReadParams, GLuint,
					   x + i, y) >> 24) & 0xFF;
      }
   }
   READ_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
}


static void
write_stencil_pixels(GLcontext * ctx, struct gl_renderbuffer *rb,
                     GLuint n, const GLint x[], const GLint y[],
                     const void *values, const GLubyte mask[])
{
   const GLubyte *stencil = (const GLubyte *) values;
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   GrLfbInfo_t info;
   GrLfbInfo_t backBufferInfo;

   GetBackBufferInfo(fxMesa, &backBufferInfo);
   /*
    * Note that the _LOCK macro adds a curly brace,
    * and the UNLOCK macro removes it.
    */
   WRITE_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER, GR_LFBWRITEMODE_ANY);
   {
      const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
      const GLint winX = fxMesa->x_offset;
      LFBParameters ReadParams;
      GLuint i;

      GetFbParams(fxMesa, &info, &backBufferInfo, &ReadParams,
		  sizeof(GLuint));
      for (i = 0; i < n; i++) {
	 const GLint scrX = winX + x[i];
	 const GLint scrY = winY - y[i];
	 if ((!mask || mask[i]) && visible_pixel(fxMesa, scrX, scrY)) {
	    GLuint z =
	       GET_FB_DATA(&ReadParams, GLuint, scrX, scrY) & 0x00FFFFFF;
	    z |= (stencil[i] & 0xFF) << 24;
	    PUT_FB_DATA(&ReadParams, GLuint, scrX, scrY, z);
	 }
      }
   }
   WRITE_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
}


static void
read_stencil_pixels(GLcontext * ctx, struct gl_renderbuffer *rb,
                    GLuint n, const GLint x[], const GLint y[],
                    void *values)
{
   GLubyte *stencil = (GLubyte *) values;
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   GrLfbInfo_t info;
   GrLfbInfo_t backBufferInfo;

   GetBackBufferInfo(fxMesa, &backBufferInfo);
   /*
    * Note that the _LOCK macro adds a curly brace,
    * and the UNLOCK macro removes it.
    */
   READ_FB_SPAN_LOCK(fxMesa, info, GR_BUFFER_AUXBUFFER);
   {
      const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
      const GLint winX = fxMesa->x_offset;
      GLuint i;
      LFBParameters ReadParams;

      GetFbParams(fxMesa, &info, &backBufferInfo, &ReadParams,
		  sizeof(GLuint));
      for (i = 0; i < n; i++) {
	 const GLint scrX = winX + x[i];
	 const GLint scrY = winY - y[i];
	 stencil[i] =
	    (GET_FB_DATA(&ReadParams, GLuint, scrX, scrY) >> 24) & 0xFF;
      }
   }
   READ_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER);
}

#define VISUAL_EQUALS_RGBA(vis, r, g, b, a)        \
   ((vis.redBits == r) &&                         \
    (vis.greenBits == g) &&                       \
    (vis.blueBits == b) &&                        \
    (vis.alphaBits == a))




/**********************************************************************/
/*                    Locking for swrast                              */
/**********************************************************************/


static void tdfxSpanRenderStart( GLcontext *ctx )
{
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   LOCK_HARDWARE(fxMesa);
}

static void tdfxSpanRenderFinish( GLcontext *ctx )
{
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
   _swrast_flush( ctx );
   UNLOCK_HARDWARE(fxMesa);
}

/**********************************************************************/
/*                    Initialize swrast device driver                 */
/**********************************************************************/

void tdfxDDInitSpanFuncs( GLcontext *ctx )
{
   struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
   swdd->SpanRenderStart          = tdfxSpanRenderStart;
   swdd->SpanRenderFinish         = tdfxSpanRenderFinish; 
}



/**
 * Plug in the Get/Put routines for the given driRenderbuffer.
 */
void
tdfxSetSpanFunctions(driRenderbuffer *drb, const GLvisual *vis)
{
   if (drb->Base.InternalFormat == GL_RGBA) {
      if (vis->redBits == 5 && vis->greenBits == 6 && vis->blueBits == 5) {
         tdfxInitPointers_RGB565(&drb->Base);
      }
      else if (vis->redBits == 8 && vis->greenBits == 8
               && vis->blueBits == 8 && vis->alphaBits == 0) {
         tdfxInitPointers_RGB888(&drb->Base);
      }
      else if (vis->redBits == 8 && vis->greenBits == 8
               && vis->blueBits == 8 && vis->alphaBits == 8) {
         tdfxInitPointers_ARGB8888(&drb->Base);
      }
      else {
         _mesa_problem(NULL, "problem in tdfxSetSpanFunctions");
      }
   }
   else if (drb->Base.InternalFormat == GL_DEPTH_COMPONENT16 ||
            drb->Base.InternalFormat == GL_DEPTH_COMPONENT24) {
      drb->Base.GetRow        = tdfxDDReadDepthSpan;
      drb->Base.GetValues     = tdfxDDReadDepthPixels;
      drb->Base.PutRow        = tdfxDDWriteDepthSpan;
      drb->Base.PutMonoRow    = tdfxDDWriteMonoDepthSpan;
      drb->Base.PutValues     = tdfxDDWriteDepthPixels;
      drb->Base.PutMonoValues = NULL;
   }
   else if (drb->Base.InternalFormat == GL_STENCIL_INDEX8_EXT) {
      drb->Base.GetRow        = read_stencil_span;
      drb->Base.GetValues     = read_stencil_pixels;
      drb->Base.PutRow        = write_stencil_span;
      drb->Base.PutMonoRow    = write_mono_stencil_span;
      drb->Base.PutValues     = write_stencil_pixels;
      drb->Base.PutMonoValues = NULL;
   }
}