Initial work for GL_EXT_packed_depth_stencil extension.

glReadPixels done, glDrawPixels mostly done.

4 files changed, 243 insertions, 25 deletions

diff --git a/src/mesa/swrast/s_copypix.c b/src/mesa/swrast/s_copypix.c
index ed6a02ee13..4b8c7c4fa2 100644
--- a/src/mesa/swrast/s_copypix.c
+++ b/src/mesa/swrast/s_copypix.c
@@ -699,6 +699,16 @@ copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
 }
 
 
+static void
+copy_depth_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                          GLint width, GLint height, GLint destx, GLint desty)
+{
+
+
+
+}
+
+
 /**
  * Do software-based glCopyPixels.
  * By time we get here, all parameters will have been error-checked.
@@ -729,6 +739,9 @@ _swrast_CopyPixels( GLcontext *ctx,
    case GL_STENCIL:
       copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
       break;
+   case GL_DEPTH_STENCIL_EXT:
+      copy_depth_stencil_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      break;
    default:
       _mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
    }
diff --git a/src/mesa/swrast/s_drawpix.c b/src/mesa/swrast/s_drawpix.c
index d908ca4db4..c1f33a2fa3 100644
--- a/src/mesa/swrast/s_drawpix.c
+++ b/src/mesa/swrast/s_drawpix.c
@@ -641,7 +641,6 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
                              ? MAX_WIDTH : (width - skipPixels);
          ASSERT(span.end <= MAX_WIDTH);
          for (row = 0; row < height; row++, spanY++) {
-            GLfloat floatSpan[MAX_WIDTH];
             const GLvoid *zSrc = _mesa_image_address2d(unpack,
                                                       pixels, width, height,
                                                       GL_DEPTH_COMPONENT, type,
@@ -654,15 +653,9 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
             span.y = spanY;
             span.end = spanEnd;
 
-            _mesa_unpack_depth_span(ctx, span.end, floatSpan, type,
-                                    zSrc, unpack);
-            /* clamp depth values to [0,1] and convert from floats to ints */
-            {
-               GLuint i;
-               for (i = 0; i < span.end; i++) {
-                  span.array->z[i] = (GLuint) (floatSpan[i] * depthMax);
-               }
-            }
+            _mesa_unpack_depth_span(ctx, span.end,
+                                    GL_UNSIGNED_INT, span.array->z, depthMax,
+                                    type, zSrc, unpack);
             if (zoom) {
                _swrast_write_zoomed_depth_span(ctx, &span, desty, skipPixels);
             }
@@ -840,6 +833,102 @@ draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
 }
 
 
+
+static void
+draw_depth_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
+                          GLsizei width, GLsizei height, GLenum type,
+                          const struct gl_pixelstore_attrib *unpack,
+                          const GLvoid *pixels)
+{
+   const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
+   const GLuint stencilMask = ctx->Stencil.WriteMask[0];
+   const GLuint stencilType = (STENCIL_BITS == 8) ? 
+      GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
+   struct gl_renderbuffer *depthRb, *stencilRb;
+   struct gl_pixelstore_attrib clippedUnpack = *unpack;
+   GLint i;
+
+   depthRb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+   stencilRb = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+
+   ASSERT(depthRb);
+   ASSERT(stencilRb);
+
+   if (!zoom) {
+      if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,
+                                 &clippedUnpack)) {
+         /* totally clipped */
+         return;
+      }
+   }
+
+   /* XXX need to do pixelzoom! */
+
+   for (i = 0; i < height; i++) {
+      const GLuint *depthStencilSrc = (const GLuint *)
+         _mesa_image_address2d(&clippedUnpack, pixels, width, height,
+                               GL_DEPTH_STENCIL_EXT, type, i, 0);
+
+      if (ctx->Depth.Mask) {
+         if (ctx->Pixel.DepthScale == 1.0F && ctx->Pixel.DepthBias == 0.0F
+             && depthRb->DepthBits == 24) {
+            /* fast path 24-bit zbuffer */
+            GLuint zValues[MAX_WIDTH];
+            GLint j;
+            ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
+            for (j = 0; j < width; j++) {
+               zValues[j] = depthStencilSrc[j] >> 8;
+            }
+            if (zoom)
+               ;
+            else
+               depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues, NULL);
+         }
+         else if (ctx->Pixel.DepthScale == 1.0F && ctx->Pixel.DepthBias == 0.0F
+                  && depthRb->DepthBits == 16) {
+            /* fast path 16-bit zbuffer */
+            GLushort zValues[MAX_WIDTH];
+            GLint j;
+            ASSERT(depthRb->DataType == GL_UNSIGNED_SHORT);
+            for (j = 0; j < width; j++) {
+               zValues[j] = depthStencilSrc[j] >> 16;
+            }
+            if (zoom)
+               ;
+            else
+               depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues, NULL);
+         }
+         else {
+            /* general case */
+            GLuint zValues[MAX_WIDTH];
+            _mesa_unpack_depth_span(ctx, width,
+                                    depthRb->DataType, zValues, depthScale,
+                                    type, depthStencilSrc, &clippedUnpack);
+            if (zoom)
+               ;
+            else
+               depthRb->PutRow(ctx, depthRb, width, x, y + i, zValues, NULL);
+         }
+      }
+
+      if (stencilMask != 0x0) {
+         GLstencil stencilValues[MAX_WIDTH];
+         /* get stencil values, with shift/offset/mapping */
+         _mesa_unpack_stencil_span(ctx, width, stencilType, stencilValues,
+                                   type, depthStencilSrc, &clippedUnpack,
+                                   ctx->_ImageTransferState);
+         if (zoom)
+            ;
+         else
+            _swrast_write_stencil_span(ctx, width, x, y + i, stencilValues);
+      }
+
+   }
+}
+
+
+
 /**
  * Execute software-based glDrawPixels.
  * By time we get here, all error checking will have been done.
@@ -905,6 +994,10 @@ _swrast_DrawPixels( GLcontext *ctx,
    case GL_ABGR_EXT:
       draw_rgba_pixels(ctx, x, y, width, height, format, type, unpack, pixels);
       break;
+   case GL_DEPTH_STENCIL_EXT:
+      draw_depth_stencil_pixels(ctx, x, y, width, height,
+                                type, unpack, pixels);
+      break;
    default:
       _mesa_problem(ctx, "unexpected format in _swrast_DrawPixels");
       /* don't return yet, clean-up */
diff --git a/src/mesa/swrast/s_readpix.c b/src/mesa/swrast/s_readpix.c
index 423661a872..984205d44d 100644
--- a/src/mesa/swrast/s_readpix.c
+++ b/src/mesa/swrast/s_readpix.c
@@ -105,7 +105,7 @@ read_depth_pixels( GLcontext *ctx,
 
    bias_or_scale = ctx->Pixel.DepthBias != 0.0 || ctx->Pixel.DepthScale != 1.0;
 
-   if (type == GL_UNSIGNED_SHORT && fb->Visual.depthBits == 16
+   if (type == GL_UNSIGNED_SHORT && rb->DepthBits == 16
        && !bias_or_scale && !packing->SwapBytes) {
       /* Special case: directly read 16-bit unsigned depth values. */
       GLint j;
@@ -117,7 +117,25 @@ read_depth_pixels( GLcontext *ctx,
          rb->GetRow(ctx, rb, width, x, y, dest);
       }
    }
-   else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 32
+   else if (type == GL_UNSIGNED_INT && rb->DepthBits == 24
+            && !bias_or_scale && !packing->SwapBytes) {
+      /* Special case: directly read 24-bit unsigned depth values. */
+      GLint j;
+      ASSERT(rb->InternalFormat == GL_DEPTH_COMPONENT32);
+      ASSERT(rb->DataType == GL_UNSIGNED_INT);
+      for (j = 0; j < height; j++, y++) {
+         GLuint *dest = (GLuint *)
+            _mesa_image_address2d(packing, pixels, width, height,
+                                  GL_DEPTH_COMPONENT, type, j, 0);
+         GLint k;
+         rb->GetRow(ctx, rb, width, x, y, dest);
+         /* convert range from 24-bit to 32-bit */
+         for (k = 0; k < width; k++) {
+            dest[k] = (dest[k] << 8) | (dest[k] >> 24);
+         }
+      }
+   }
+   else if (type == GL_UNSIGNED_INT && rb->DepthBits == 32
             && !bias_or_scale && !packing->SwapBytes) {
       /* Special case: directly read 32-bit unsigned depth values. */
       GLint j;
@@ -396,6 +414,77 @@ read_rgba_pixels( GLcontext *ctx,
 
 
 /**
+ * Read combined depth/stencil values.
+ * We'll have already done error checking to be sure the expected
+ * depth and stencil buffers really exist.
+ */
+static void
+read_depth_stencil_pixels(GLcontext *ctx,
+                          GLint x, GLint y,
+                          GLsizei width, GLsizei height,
+                          GLenum type, GLvoid *pixels,
+                          const struct gl_pixelstore_attrib *packing )
+{
+   struct gl_renderbuffer *depthRb, *stencilRb;
+   GLint i;
+
+   depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+   stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
+
+   ASSERT(depthRb);
+   ASSERT(stencilRb);
+
+   for (i = 0; i < height; i++) {
+      GLuint zVals[MAX_WIDTH]; /* 24-bit values! */
+      GLstencil stencilVals[MAX_WIDTH];
+      GLint j;
+
+      GLuint *depthStencilDst = (GLuint *)
+         _mesa_image_address2d(packing, pixels, width, height,
+                               GL_DEPTH_STENCIL_EXT, type, i, 0);
+
+      /* get depth values */
+      if (ctx->Pixel.DepthScale == 1.0
+          && ctx->Pixel.DepthBias == 0.0
+          && depthRb->DepthBits == 24) {
+         /* ideal case */
+         ASSERT(depthRb->DataType == GL_UNSIGNED_INT);
+         /* note, we've already been clipped */
+         depthRb->GetRow(ctx, depthRb, width, x, y + i, zVals);
+      }
+      else {
+         /* general case */
+         GLfloat depthVals[MAX_WIDTH];
+         _swrast_read_depth_span_float(ctx, depthRb, width, x, y + i,
+                                       depthVals);
+         if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0) {
+            _mesa_scale_and_bias_depth(ctx, width, depthVals);
+         }
+         /* convert to 24-bit GLuints */
+         for (j = 0; j < width; j++) {
+            zVals[j] = FLOAT_TO_UINT(depthVals[j]) >> 8;
+         }
+      }
+
+      /* get stencil values */
+      _swrast_read_stencil_span(ctx, stencilRb, width, x, y + i, stencilVals);
+      if (ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset) {
+         _mesa_shift_and_offset_stencil(ctx, width, stencilVals);
+      }
+      if (ctx->Pixel.MapStencilFlag) {
+         _mesa_map_stencil(ctx, width, stencilVals);
+      }
+
+      for (j = 0; j < width; j++) {
+         /* build combined Z/stencil values */
+         depthStencilDst[j] = (zVals[j] << 8) | (stencilVals[j] & 0xff);
+      }
+   }
+}
+
+
+
+/**
  * Software fallback routine for ctx->Driver.ReadPixels().
  * By time we get here, all error checking will have been done.
  */
@@ -407,19 +496,13 @@ _swrast_ReadPixels( GLcontext *ctx,
 		    GLvoid *pixels )
 {
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   struct gl_pixelstore_attrib clippedPacking;
+   struct gl_pixelstore_attrib clippedPacking = *packing;
 
    if (swrast->NewState)
       _swrast_validate_derived( ctx );
 
    /* Do all needed clipping here, so that we can forget about it later */
-   clippedPacking = *packing;
-   if (clippedPacking.RowLength == 0) {
-      clippedPacking.RowLength = width;
-   }
-   if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height,
-                              &clippedPacking.SkipPixels,
-                              &clippedPacking.SkipRows)) {
+   if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
       /* The ReadPixels region is totally outside the window bounds */
       return;
    }
@@ -473,6 +556,10 @@ _swrast_ReadPixels( GLcontext *ctx,
          read_rgba_pixels(ctx, x, y, width, height,
                           format, type, pixels, &clippedPacking);
 	 break;
+      case GL_DEPTH_STENCIL_EXT:
+         read_depth_stencil_pixels(ctx, x, y, width, height,
+                                   type, pixels, &clippedPacking);
+         break;
       default:
 	 _mesa_problem(ctx, "unexpected format in _swrast_ReadPixels");
          /* don't return yet, clean-up */
diff --git a/src/mesa/swrast/s_zoom.c b/src/mesa/swrast/s_zoom.c
index 580e25e945..dfbc691dc1 100644
--- a/src/mesa/swrast/s_zoom.c
+++ b/src/mesa/swrast/s_zoom.c
@@ -75,8 +75,7 @@ zoom_span( GLcontext *ctx, const struct sw_span *span,
       zoomed.interpMask = span->interpMask & ~SPAN_INDEX;
       zoomed.arrayMask |= SPAN_INDEX;
    }
-   else {
-      assert(format == GL_DEPTH_COMPONENT);
+   else if (format == GL_DEPTH_COMPONENT) {
       /* Copy color info */
       zoomed.red = span->red;
       zoomed.green = span->green;
@@ -90,6 +89,14 @@ zoom_span( GLcontext *ctx, const struct sw_span *span,
       zoomed.interpMask = span->interpMask & ~SPAN_Z;
       zoomed.arrayMask |= SPAN_Z;
    }
+   else if (format == GL_DEPTH_COMPONENT16 ||
+            format == GL_DEPTH_COMPONENT32) {
+      /* writing Z values directly to depth buffer, bypassing fragment ops */
+   }
+   else {
+      _mesa_problem(ctx, "Bad format in zoom_span");
+      return;
+   }
 
    /*
     * Compute which columns to draw: [c0, c1)
@@ -230,9 +237,8 @@ zoom_span( GLcontext *ctx, const struct sw_span *span,
          }
       }
    }
-   else {
+   else if (format == GL_DEPTH_COMPONENT) {
       const GLuint *zValues = (const GLuint *) src;
-      assert(format == GL_DEPTH_COMPONENT);
       if (ctx->Pixel.ZoomX == -1.0F) {
          /* common case */
          for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
@@ -260,7 +266,26 @@ zoom_span( GLcontext *ctx, const struct sw_span *span,
       else
          format = GL_COLOR_INDEX;
    }
-
+   else if (format == GL_DEPTH_COMPONENT32) {
+      /* 32-bit Z values */
+      struct gl_renderbuffer *rb
+         = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
+      const GLuint *zSrc32 = (const GLuint *) src;
+      GLuint zDst32[MAX_WIDTH];
+      const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
+      for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
+         i = (GLint) ((j + skipCol) * xscale);
+         if (ctx->Pixel.ZoomX < 0.0) {
+            ASSERT(i <= 0);
+            i = span->end + i - 1;
+         }
+         ASSERT(i >= 0);
+         ASSERT(i < (GLint) span->end);
+         zDst32[j] = zSrc32[i];
+      }
+      rb->PutRow(ctx, rb, zoomed.end, zoomed.x, zoomed.y, zDst32, NULL);
+      return;
+   }
 
    /* write the span in rows [r0, r1) */
    if (format == GL_RGBA || format == GL_RGB) {