1 files changed, 158 insertions, 0 deletions
diff --git a/cogl/cogl/driver/gl/cogl-texture-gl.c b/cogl/cogl/driver/gl/cogl-texture-gl.c
new file mode 100644
index 000000000..2e281c03b
--- /dev/null
+++ b/cogl/cogl/driver/gl/cogl-texture-gl.c
@@ -0,0 +1,158 @@
+/*
+ * Cogl
+ *
+ * A Low Level GPU Graphics and Utilities API
+ *
+ * Copyright (C) 2012 Intel Corporation.
+ *
+ * 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+#include "cogl-context-private.h"
+#include "cogl-util-gl-private.h"
+#include "cogl-texture-gl-private.h"
+#include "cogl-texture-3d-private.h"
+#include "cogl-util.h"
+#include "cogl-pipeline-opengl-private.h"
+
+static inline int
+calculate_alignment (int rowstride)
+{
+  int alignment = 1 << (_cogl_util_ffs (rowstride) - 1);
+
+  return MIN (alignment, 8);
+}
+
+void
+_cogl_texture_gl_prep_alignment_for_pixels_upload (CoglContext *ctx,
+                                                   int pixels_rowstride)
+{
+  GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT,
+                          calculate_alignment (pixels_rowstride)) );
+}
+
+void
+_cogl_texture_gl_prep_alignment_for_pixels_download (CoglContext *ctx,
+                                                     int bpp,
+                                                     int width,
+                                                     int rowstride)
+{
+  int alignment;
+
+  /* If no padding is needed then we can always use an alignment of 1.
+   * We want to do this even though it is equivalent to the alignment
+   * of the rowstride because the Intel driver in Mesa currently has
+   * an optimisation when reading data into a PBO that only works if
+   * the alignment is exactly 1.
+   *
+   * https://bugs.freedesktop.org/show_bug.cgi?id=46632
+   */
+
+  if (rowstride == bpp * width)
+    alignment = 1;
+  else
+    alignment = calculate_alignment (rowstride);
+
+  GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, alignment) );
+}
+
+void
+_cogl_texture_gl_flush_legacy_texobj_wrap_modes (CoglTexture *texture,
+                                                 unsigned int wrap_mode_s,
+                                                 unsigned int wrap_mode_t,
+                                                 unsigned int wrap_mode_p)
+{
+  texture->vtable->gl_flush_legacy_texobj_wrap_modes (texture,
+                                                      wrap_mode_s,
+                                                      wrap_mode_t,
+                                                      wrap_mode_p);
+}
+
+void
+_cogl_texture_gl_flush_legacy_texobj_filters (CoglTexture *texture,
+                                              unsigned int min_filter,
+                                              unsigned int mag_filter)
+{
+  texture->vtable->gl_flush_legacy_texobj_filters (texture,
+                                                   min_filter, mag_filter);
+}
+
+void
+_cogl_texture_gl_maybe_update_max_level (CoglTexture *texture,
+                                         int max_level)
+{
+  /* This isn't supported on GLES */
+#ifdef HAVE_COGL_GL
+  CoglContext *ctx = texture->context;
+
+  if (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_TEXTURE_MAX_LEVEL) &&
+      texture->max_level < max_level)
+    {
+      CoglContext *ctx = texture->context;
+      GLuint gl_handle;
+      GLenum gl_target;
+
+      cogl_texture_get_gl_texture (texture, &gl_handle, &gl_target);
+
+      texture->max_level = max_level;
+
+      _cogl_bind_gl_texture_transient (gl_target,
+                                       gl_handle,
+                                       _cogl_texture_is_foreign (texture));
+
+      GE( ctx, glTexParameteri (gl_target,
+                                GL_TEXTURE_MAX_LEVEL, texture->max_level));
+    }
+#endif /* HAVE_COGL_GL */
+}
+
+void
+_cogl_texture_gl_generate_mipmaps (CoglTexture *texture)
+{
+  CoglContext *ctx = texture->context;
+  int n_levels = _cogl_texture_get_n_levels (texture);
+  GLuint gl_handle;
+  GLenum gl_target;
+
+  _cogl_texture_gl_maybe_update_max_level (texture, n_levels - 1);
+
+  cogl_texture_get_gl_texture (texture, &gl_handle, &gl_target);
+
+  _cogl_bind_gl_texture_transient (gl_target,
+                                   gl_handle,
+                                   _cogl_texture_is_foreign (texture));
+  GE( ctx, glGenerateMipmap (gl_target) );
+}
+
+GLenum
+_cogl_texture_gl_get_format (CoglTexture *texture)
+{
+  return texture->vtable->get_gl_format (texture);
+}