meta: Add a BlitFramebuffers-based implementation of TexSubImage

This meta path, designed for use with PBO's, creates a temporary texture
out of the PBO and uses BlitFramebuffers to do the actual texture upload.

v2 Jason Ekstrand <jason.ekstrand@intel.com>:
 - Add support for handling simple packing options

v3 Jason Ekstrand <jason.ekstrand@intel.com>:
 - Refactor to split out the texture-from-pbo code
 - Rename to _mesa_meta_pbo_TexSubImage

Reviewed-by: Neil Roberts <neil@linux.intel.com>

2 files changed, 247 insertions, 0 deletions

diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index c6aef01..87e9cc9 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -522,6 +522,15 @@ extern void
 _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
                           struct gl_texture_object *texObj);
 
+extern bool
+_mesa_meta_pbo_TexSubImage(struct gl_context *ctx, GLuint dims,
+                           struct gl_texture_image *tex_image,
+                           int xoffset, int yoffset, int zoffset,
+                           int width, int height, int depth,
+                           GLenum format, GLenum type, const void *pixels,
+                           bool allocate_storage, bool create_pbo,
+                           const struct gl_pixelstore_attrib *packing);
+
 extern void
 _mesa_meta_CopyTexSubImage(struct gl_context *ctx, GLuint dims,
                            struct gl_texture_image *texImage,
diff --git a/src/mesa/drivers/common/meta_tex_subimage.c b/src/mesa/drivers/common/meta_tex_subimage.c
new file mode 100644
index 0000000..6c92112
--- /dev/null
+++ b/src/mesa/drivers/common/meta_tex_subimage.c
@@ -0,0 +1,238 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2015 Intel Corporation.  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
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ *    Jason Ekstrand <jason.ekstrand@intel.com>
+ */
+
+#include "bufferobj.h"
+#include "buffers.h"
+#include "fbobject.h"
+#include "glformats.h"
+#include "glheader.h"
+#include "image.h"
+#include "macros.h"
+#include "meta.h"
+#include "pbo.h"
+#include "shaderapi.h"
+#include "state.h"
+#include "teximage.h"
+#include "texobj.h"
+#include "texstate.h"
+#include "uniforms.h"
+#include "varray.h"
+
+static struct gl_texture_image *
+create_texture_for_pbo(struct gl_context *ctx, bool create_pbo,
+                       GLenum pbo_target, int width, int height, int depth,
+                       GLenum format, GLenum type, const void *pixels,
+                       const struct gl_pixelstore_attrib *packing,
+                       GLuint *tmp_pbo, GLuint *tmp_tex)
+{
+   uint32_t pbo_format;
+   GLenum internal_format;
+   unsigned row_stride;
+   struct gl_buffer_object *buffer_obj;
+   struct gl_texture_object *tex_obj;
+   struct gl_texture_image *tex_image;
+   bool read_only;
+
+   if ((packing->ImageHeight != 0 && packing->ImageHeight != height) ||
+       packing->SwapBytes ||
+       packing->LsbFirst ||
+       packing->Invert)
+      return NULL;
+
+   pbo_format = _mesa_format_from_format_and_type(format, type);
+   if (_mesa_format_is_mesa_array_format(pbo_format))
+      pbo_format = _mesa_format_from_array_format(pbo_format);
+
+   if (!pbo_format || !ctx->TextureFormatSupported[pbo_format])
+      return NULL;
+
+   /* Account for SKIP_PIXELS, SKIP_ROWS, ALIGNMENT, and SKIP_IMAGES */
+   pixels = _mesa_image_address3d(packing, pixels,
+                                  width, height, format, type, 0, 0, 0);
+   row_stride = _mesa_image_row_stride(packing, width, format, type);
+
+   if (_mesa_is_bufferobj(packing->BufferObj)) {
+      *tmp_pbo = 0;
+      buffer_obj = packing->BufferObj;
+   } else {
+      assert(create_pbo);
+
+      _mesa_GenBuffers(1, tmp_pbo);
+
+      /* We are not doing this inside meta_begin/end.  However, we know the
+       * client doesn't have the given target bound, so we can go ahead and
+       * squash it.  We'll set it back when we're done.
+       */
+      _mesa_BindBuffer(pbo_target, *tmp_pbo);
+
+      _mesa_BufferData(pbo_target, row_stride * height, pixels, GL_STREAM_DRAW);
+
+      buffer_obj = ctx->Unpack.BufferObj;
+      pixels = NULL;
+
+      _mesa_BindBuffer(pbo_target, 0);
+   }
+
+   _mesa_GenTextures(1, tmp_tex);
+   tex_obj = _mesa_lookup_texture(ctx, *tmp_tex);
+   tex_obj->Target = depth > 1 ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D;
+   tex_obj->Immutable = GL_TRUE;
+   _mesa_initialize_texture_object(ctx, tex_obj, *tmp_tex, GL_TEXTURE_2D);
+
+   internal_format = _mesa_get_format_base_format(pbo_format);
+
+   tex_image = _mesa_get_tex_image(ctx, tex_obj, tex_obj->Target, 0);
+   _mesa_init_teximage_fields(ctx, tex_image, width, height, depth,
+                              0, internal_format, pbo_format);
+
+   read_only = pbo_target == GL_PIXEL_UNPACK_BUFFER;
+   if (!ctx->Driver.SetTextureStorageForBufferObject(ctx, tex_obj,
+                                                     buffer_obj,
+                                                     (intptr_t)pixels,
+                                                     row_stride,
+                                                     read_only)) {
+      _mesa_DeleteTextures(1, tmp_tex);
+      _mesa_DeleteBuffers(1, tmp_pbo);
+      return NULL;
+   }
+
+   return tex_image;
+}
+
+bool
+_mesa_meta_pbo_TexSubImage(struct gl_context *ctx, GLuint dims,
+                           struct gl_texture_image *tex_image,
+                           int xoffset, int yoffset, int zoffset,
+                           int width, int height, int depth,
+                           GLenum format, GLenum type, const void *pixels,
+                           bool allocate_storage, bool create_pbo,
+                           const struct gl_pixelstore_attrib *packing)
+{
+   GLuint pbo = 0, pbo_tex = 0, fbos[2] = { 0, 0 };
+   struct gl_texture_image *pbo_tex_image;
+   GLenum status;
+   bool success = false;
+
+   /* XXX: This should probably be passed in from somewhere */
+   const char *where = "_mesa_meta_pbo_TexSubImage";
+
+   if (!_mesa_is_bufferobj(packing->BufferObj) && !create_pbo)
+      return false;
+
+   if (format == GL_DEPTH_COMPONENT ||
+       format == GL_DEPTH_STENCIL ||
+       format == GL_STENCIL_INDEX ||
+       format == GL_COLOR_INDEX)
+      return false;
+
+   if (ctx->_ImageTransferState)
+      return false;
+
+   if (!_mesa_validate_pbo_access(dims, packing, width, height, depth,
+                                  format, type, INT_MAX, pixels)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(out of bounds PBO access)", where);
+      return true;
+   }
+
+   if (_mesa_check_disallowed_mapping(packing->BufferObj)) {
+      /* buffer is mapped - that's an error */
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(PBO is mapped)", where);
+      return true;
+   }
+
+   pbo_tex_image = create_texture_for_pbo(ctx, create_pbo,
+                                          GL_PIXEL_UNPACK_BUFFER,
+                                          width, height, depth,
+                                          format, type, pixels, packing,
+                                          &pbo, &pbo_tex);
+   if (!pbo_tex_image)
+      return false;
+
+   if (allocate_storage)
+      ctx->Driver.AllocTextureImageBuffer(ctx, tex_image);
+
+   /* Only stash the current FBO */
+   _mesa_meta_begin(ctx, 0);
+
+   _mesa_GenFramebuffers(2, fbos);
+   _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, fbos[0]);
+   _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, fbos[1]);
+
+   if (tex_image->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
+      assert(depth == 1);
+      depth = height;
+      height = 1;
+   }
+
+   _mesa_meta_bind_fbo_image(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                             pbo_tex_image, 0);
+   /* If this passes on the first layer it should pass on the others */
+   status = _mesa_CheckFramebufferStatus(GL_READ_FRAMEBUFFER);
+   if (status != GL_FRAMEBUFFER_COMPLETE)
+      goto fail;
+
+   _mesa_meta_bind_fbo_image(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                             tex_image, zoffset);
+   /* If this passes on the first layer it should pass on the others */
+   status = _mesa_CheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
+   if (status != GL_FRAMEBUFFER_COMPLETE)
+      goto fail;
+
+   _mesa_update_state(ctx);
+
+   if (_mesa_meta_BlitFramebuffer(ctx, 0, 0, width, height,
+                                  xoffset, yoffset,
+                                  xoffset + width, yoffset + height,
+                                  GL_COLOR_BUFFER_BIT, GL_NEAREST))
+      goto fail;
+
+   for (int z = 1; z < depth; z++) {
+      _mesa_meta_bind_fbo_image(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                pbo_tex_image, z);
+      _mesa_meta_bind_fbo_image(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                tex_image, zoffset + z);
+
+      _mesa_update_state(ctx);
+
+      _mesa_meta_BlitFramebuffer(ctx, 0, 0, width, height,
+                                 xoffset, yoffset,
+                                 xoffset + width, yoffset + height,
+                                 GL_COLOR_BUFFER_BIT, GL_NEAREST);
+   }
+
+   success = true;
+
+fail:
+   _mesa_DeleteFramebuffers(2, fbos);
+   _mesa_DeleteTextures(1, &pbo_tex);
+   _mesa_DeleteBuffers(1, &pbo);
+
+   _mesa_meta_end(ctx);
+
+   return success;
+}