Support for combined depth/stencil renderbuffers (GL_EXT_packed_depth_stencil).

depthstencil.c provides wrappers for treating depth/stencil buffers either
as regular depth or stencil renderbuffers.

1 files changed, 549 insertions, 0 deletions

diff --git a/src/mesa/main/depthstencil.c b/src/mesa/main/depthstencil.c
new file mode 100644
index 0000000000..90e434118e
--- /dev/null
+++ b/src/mesa/main/depthstencil.c
@@ -0,0 +1,549 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5
+ *
+ * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "glheader.h"
+#include "imports.h"
+#include "context.h"
+#include "fbobject.h"
+#include "mtypes.h"
+#include "depthstencil.h"
+#include "renderbuffer.h"
+
+
+/**
+ * Adaptor/wrappers for GL_DEPTH_STENCIL renderbuffers.
+ *
+ * The problem with a GL_DEPTH_STENCIL renderbuffer is that sometimes we
+ * want to treat it as a stencil buffer, other times we want to treat it
+ * as a depth/z buffer and still other times when we want to treat it as
+ * a combined Z+stencil buffer!  That implies we need three different sets
+ * of Get/Put functions.
+ *
+ * We solve this by wrapping the Z24_S8 renderbuffer with depth and stencil
+ * adaptors, each with the right kind of depth/stencil Get/Put functions.
+ */
+
+
+static void *
+nop_get_pointer(GLcontext *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
+{
+   return NULL;
+}
+
+
+/**
+ * Delete a depth or stencil renderbuffer.
+ */
+static void
+delete_wrapper(struct gl_renderbuffer *rb)
+{
+   struct gl_renderbuffer *dsrb = rb->Wrapped;
+   assert(dsrb);
+   assert(rb->InternalFormat == GL_DEPTH_COMPONENT24 ||
+          rb->InternalFormat == GL_STENCIL_INDEX8_EXT);
+   /* decrement refcount on the wrapped buffer and delete it if necessary */
+   dsrb->RefCount--;
+   if (dsrb->RefCount <= 0) {
+      dsrb->Delete(dsrb);
+   }
+   _mesa_free(rb);
+}
+
+
+/*======================================================================
+ * Depth wrapper around depth/stencil renderbuffer
+ */
+
+static void
+get_row_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+            GLint x, GLint y, void *values)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLuint *dst = (GLuint *) values;
+   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (!src) {
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      src = temp;
+   }
+   for (i = 0; i < count; i++) {
+      dst[i] = src[i] >> 8;
+   }
+}
+
+static void
+get_values_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+               const GLint x[], const GLint y[], void *values)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLuint *dst = (GLuint *) values;
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(count <= MAX_WIDTH);
+   /* don't bother trying direct access */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      dst[i] = temp[i] >> 8;
+   }
+}
+
+static void
+put_row_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+            GLint x, GLint y, const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   const GLuint *src = (const GLuint *) values;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i] = (src[i] << 8) | (dst[i] & 0xff);
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (src[i] << 8) | (temp[i] & 0xff);
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_row_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+                 GLint x, GLint y, const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   const GLuint shiftedVal = *((GLuint *) value) << 8;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i] = shiftedVal | (dst[i] & 0xff);
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = shiftedVal | (temp[i] & 0xff);
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_values_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+               const GLint x[], const GLint y[],
+               const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   const GLubyte *src = (const GLubyte *) values;
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+            *dst = (src[i] << 8) | (*dst & 0xff);
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (src[i] << 8) | (temp[i] & 0xff);
+         }
+      }
+      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_values_z24(GLcontext *ctx, struct gl_renderbuffer *z24rb,
+                    GLuint count, const GLint x[], const GLint y[],
+                    const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   const GLuint shiftedVal = *((GLuint *) value) << 8;
+   /* get, modify, put */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      if (!mask || mask[i]) {
+         temp[i] = shiftedVal | (temp[i] & 0xff);
+      }
+   }
+   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+}
+
+
+/**
+ * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
+ * a depth renderbuffer.
+ * \return new depth renderbuffer
+ */
+struct gl_renderbuffer *
+_mesa_new_z24_renderbuffer_wrapper(GLcontext *ctx,
+                                   struct gl_renderbuffer *dsrb)
+{
+   struct gl_renderbuffer *z24rb;
+
+   ASSERT(dsrb->_BaseFormat == GL_DEPTH_STENCIL_EXT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+
+   z24rb = _mesa_new_renderbuffer(ctx, 0);
+   if (!z24rb)
+      return NULL;
+
+   z24rb->Wrapped = dsrb;
+   z24rb->Name = dsrb->Name;
+   z24rb->RefCount = 1;
+   z24rb->Width = dsrb->Width;
+   z24rb->Height = dsrb->Height;
+   z24rb->InternalFormat = GL_DEPTH_COMPONENT24_ARB;
+   z24rb->_BaseFormat = GL_DEPTH_COMPONENT;
+   z24rb->DataType = GL_UNSIGNED_INT;
+   z24rb->DepthBits = 24;
+   z24rb->Data = NULL;
+   z24rb->Delete = delete_wrapper;
+   z24rb->GetPointer = nop_get_pointer;
+   z24rb->GetRow = get_row_z24;
+   z24rb->GetValues = get_values_z24;
+   z24rb->PutRow = put_row_z24;
+   z24rb->PutRowRGB = NULL;
+   z24rb->PutMonoRow = put_mono_row_z24;
+   z24rb->PutValues = put_values_z24;
+   z24rb->PutMonoValues = put_mono_values_z24;
+
+   return z24rb;
+}
+
+
+/*======================================================================
+ * Stencil wrapper around depth/stencil renderbuffer
+ */
+
+static void
+get_row_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+           GLint x, GLint y, void *values)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLubyte *dst = (GLubyte *) values;
+   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (!src) {
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      src = temp;
+   }
+   for (i = 0; i < count; i++) {
+      dst[i] = src[i] & 0xff;
+   }
+}
+
+static void
+get_values_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+              const GLint x[], const GLint y[], void *values)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLubyte *dst = (GLubyte *) values;
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(count <= MAX_WIDTH);
+   /* don't bother trying direct access */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      dst[i] = temp[i] & 0xff;
+   }
+}
+
+static void
+put_row_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+           GLint x, GLint y, const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte *src = (const GLubyte *) values;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i] = (dst[i] & 0xffffff00) | src[i];
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (temp[i] & 0xffffff00) | src[i];
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_row_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+                GLint x, GLint y, const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte val = *((GLubyte *) value);
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i] = (dst[i] & 0xffffff00) | val;
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (temp[i] & 0xffffff00) | val;
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_values_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+              const GLint x[], const GLint y[],
+              const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte *src = (const GLubyte *) values;
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+            *dst = (*dst & 0xffffff00) | src[i];
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (temp[i] & 0xffffff00) | src[i];
+         }
+      }
+      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_values_s8(GLcontext *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+                   const GLint x[], const GLint y[],
+                   const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   const GLubyte val = *((GLubyte *) value);
+   /* get, modify, put */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      if (!mask || mask[i]) {
+         temp[i] = (temp[i] & 0xffffff) | val;
+      }
+   }
+   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+}
+
+
+/**
+ * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
+ * a stencil renderbuffer.
+ * \return new stencil renderbuffer
+ */
+struct gl_renderbuffer *
+_mesa_new_s8_renderbuffer_wrapper(GLcontext *ctx, struct gl_renderbuffer *dsrb)
+{
+   struct gl_renderbuffer *s8rb;
+
+   ASSERT(dsrb->_BaseFormat == GL_DEPTH_STENCIL_EXT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+
+   s8rb = _mesa_new_renderbuffer(ctx, 0);
+   if (!s8rb)
+      return NULL;
+
+   s8rb->Wrapped = dsrb;
+   s8rb->Name = dsrb->Name;
+   s8rb->RefCount = 1;
+   s8rb->Width = dsrb->Width;
+   s8rb->Height = dsrb->Height;
+   s8rb->InternalFormat = GL_STENCIL_INDEX8_EXT;
+   s8rb->_BaseFormat = GL_STENCIL_INDEX;
+   s8rb->DataType = GL_UNSIGNED_BYTE;
+   s8rb->StencilBits = 8;
+   s8rb->Data = NULL;
+   s8rb->Delete = delete_wrapper;
+   s8rb->GetPointer = nop_get_pointer;
+   s8rb->GetRow = get_row_s8;
+   s8rb->GetValues = get_values_s8;
+   s8rb->PutRow = put_row_s8;
+   s8rb->PutRowRGB = NULL;
+   s8rb->PutMonoRow = put_mono_row_s8;
+   s8rb->PutValues = put_values_s8;
+   s8rb->PutMonoValues = put_mono_values_s8;
+
+   return s8rb;
+}
+
+
+/**
+ * Merge data from a depth renderbuffer and a stencil renderbuffer into a
+ * combined depth/stencil renderbuffer.
+ */
+void
+_mesa_merge_depth_stencil_buffers(GLcontext *ctx,
+                                  struct gl_renderbuffer *dest,
+                                  struct gl_renderbuffer *depth,
+                                  struct gl_renderbuffer *stencil)
+{
+   GLuint depthVals[MAX_WIDTH];
+   GLubyte stencilVals[MAX_WIDTH];
+   GLuint combined[MAX_WIDTH];
+   GLuint row, width;
+
+   ASSERT(dest);
+   ASSERT(depth);
+   ASSERT(stencil);
+
+   ASSERT(dest->InternalFormat == GL_DEPTH24_STENCIL8_EXT);
+   ASSERT(dest->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(depth->InternalFormat == GL_DEPTH_COMPONENT24);
+   ASSERT(depth->DataType == GL_UNSIGNED_INT);
+   ASSERT(stencil->InternalFormat == GL_STENCIL_INDEX8_EXT);
+   ASSERT(stencil->DataType == GL_UNSIGNED_BYTE);
+
+   ASSERT(dest->Width == depth->Width);
+   ASSERT(dest->Height == depth->Height);
+   ASSERT(dest->Width == stencil->Width);
+   ASSERT(dest->Height == stencil->Height);
+
+   width = dest->Width;
+   for (row = 0; row < dest->Height; row++) {
+      GLuint i;
+      depth->GetRow(ctx, depth, width, 0, row, depthVals);
+      stencil->GetRow(ctx, stencil, width, 0, row, stencilVals);
+      for (i = 0; i < width; i++) {
+         combined[i] = (depthVals[i] << 8) | stencilVals[i];
+      }
+      dest->PutRow(ctx, dest, width, 0, row, combined, NULL);
+   }
+}
+
+
+/**
+ * Split combined depth/stencil renderbuffer data into separate depth/stencil
+ * buffers.
+ */
+void
+_mesa_split_depth_stencil_buffer(GLcontext *ctx,
+                                 struct gl_renderbuffer *source,
+                                 struct gl_renderbuffer *depth,
+                                 struct gl_renderbuffer *stencil)
+{
+   GLuint depthVals[MAX_WIDTH];
+   GLubyte stencilVals[MAX_WIDTH];
+   GLuint combined[MAX_WIDTH];
+   GLuint row, width;
+
+   ASSERT(source);
+   ASSERT(depth);
+   ASSERT(stencil);
+
+   ASSERT(source->InternalFormat == GL_DEPTH24_STENCIL8_EXT);
+   ASSERT(source->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(depth->InternalFormat == GL_DEPTH_COMPONENT24);
+   ASSERT(depth->DataType == GL_UNSIGNED_INT);
+   ASSERT(stencil->InternalFormat == GL_STENCIL_INDEX8_EXT);
+   ASSERT(stencil->DataType == GL_UNSIGNED_BYTE);
+
+   ASSERT(source->Width == depth->Width);
+   ASSERT(source->Height == depth->Height);
+   ASSERT(source->Width == stencil->Width);
+   ASSERT(source->Height == stencil->Height);
+
+   width = source->Width;
+   for (row = 0; row < source->Height; row++) {
+      GLuint i;
+      source->GetRow(ctx, source, width, 0, row, combined);
+      for (i = 0; i < width; i++) {
+         depthVals[i] = combined[i] >> 8;
+         stencilVals[i] = combined[i] & 0xff;
+      }
+      depth->PutRow(ctx, depth, width, 0, row, depthVals, NULL);
+      stencil->PutRow(ctx, stencil, width, 0, row, stencilVals, NULL);
+   }
+}