de8a6314f1
The only way the user has to set the mipmap filters is through the material/layer API. This API defaults to GL_LINEAR/GL_LINEAR for the max and min filters. With the main use case of cogl being 2D interfaces, it makes sense do default to GL_LINEAR for the min filter. When creating new textures, we did not set any filter on them, using OpenGL defaults': GL_NEAREST_MIPMAP_LINEAR for the min filter and GL_LINEAR for the max filter. This will make the driver allocate memory for the mipmap tree, memory that will not be used in the nominal case (as the material API defaults to GL_LINEAR). This patch tries to ensure that the min filter is set to GL_LINEAR before any glTexImage*() call is done on the texture by setting the filter when generating new OpenGL handles.
193 lines
7.2 KiB
C
193 lines
7.2 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __COGL_TEXTURE_DRIVER_H
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#define __COGL_TEXTURE_DRIVER_H
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/*
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* A very small wrapper around glGenTextures() that ensures we default to
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* non-mipmap filters when creating textures. This is to save some memory as
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* the driver will not allocate room for the mipmap tree.
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*/
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void
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_cogl_texture_driver_gen (GLenum gl_target,
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GLsizei n,
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GLuint *textures);
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/*
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* Basically just a wrapper around glBindTexture, but the GLES2 backend
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* for example also wants to know about the internal format so it can
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* identify when alpha only textures are bound.
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*/
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void
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_cogl_texture_driver_bind (GLenum gl_target, GLuint gl_handle, GLenum gl_intformat);
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/*
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* This sets up the glPixelStore state for an upload to a destination with
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* the same size, and with no offset.
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*/
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/* NB: GLES can't upload a sub region of pixel data from a larger source
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* buffer which is why this interface is limited. The GL driver has a more
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* flexible version of this function that is uses internally */
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void
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_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
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int pixels_bpp);
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/*
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* This uploads a sub-region from source_bmp to a single GL texture handle (i.e
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* a single CoglTexture slice)
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*
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* It also updates the array of tex->first_pixels[slice_index] if
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* dst_{x,y} == 0
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*
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* The driver abstraction is in place because GLES doesn't support the pixel
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* store options required to source from a subregion, so for GLES we have
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* to manually create a transient source bitmap.
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*
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* XXX: sorry for the ridiculous number of arguments :-(
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*/
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void
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_cogl_texture_driver_upload_subregion_to_gl (GLenum gl_target,
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GLuint gl_handle,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height,
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CoglBitmap *source_bmp,
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GLuint source_gl_format,
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GLuint source_gl_type);
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/*
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* Replaces the contents of the GL texture with the entire bitmap. On
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* GL this just directly calls glTexImage2D, but under GLES it needs
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* to copy the bitmap if the rowstride is not a multiple of a possible
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* alignment value because there is no GL_UNPACK_ROW_LENGTH
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*/
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void
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_cogl_texture_driver_upload_to_gl (GLenum gl_target,
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GLuint gl_handle,
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CoglBitmap *source_bmp,
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GLint internal_gl_format,
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GLuint source_gl_format,
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GLuint source_gl_type);
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/*
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* This sets up the glPixelStore state for an download to a destination with
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* the same size, and with no offset.
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*/
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/* NB: GLES can't download pixel data into a sub region of a larger destination
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* buffer, the GL driver has a more flexible version of this function that it
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* uses internally. */
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void
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_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
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int pixels_bpp);
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/*
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* This driver abstraction is in place because GLES doesn't have a sane way to
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* download data from a texture so you litterally render the texture to the
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* backbuffer, and retrive the data using glReadPixels :-(
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*/
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gboolean
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_cogl_texture_driver_download_from_gl (CoglTexture *tex,
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CoglBitmap *target_bmp,
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GLuint target_gl_format,
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GLuint target_gl_type);
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/*
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* This driver abstraction is needed because GLES doesn't support glGetTexImage
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* (). On GLES this currently just returns FALSE which will lead to a generic
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* fallback path being used that simply renders the texture and reads it back
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* from the framebuffer. (See _cogl_texture_draw_and_read () )
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*/
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gboolean
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_cogl_texture_driver_gl_get_tex_image (GLenum gl_target,
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GLenum dest_gl_format,
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GLenum dest_gl_type,
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guint8 *dest);
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/*
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* It may depend on the driver as to what texture sizes are supported...
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*/
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gboolean
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_cogl_texture_driver_size_supported (GLenum gl_target,
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GLenum gl_format,
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GLenum gl_type,
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int width,
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int height);
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/*
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* This driver abstraction is needed because GLES doesn't support setting
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* a texture border color.
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*/
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void
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_cogl_texture_driver_try_setting_gl_border_color (
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GLuint gl_target,
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const GLfloat *transparent_color);
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/*
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* XXX: this should live in cogl/{gl,gles}/cogl.c
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*/
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gboolean
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_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
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CoglPixelFormat *out_format);
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/*
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* XXX: this should live in cogl/{gl,gles}/cogl.c
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*/
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CoglPixelFormat
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_cogl_pixel_format_to_gl (CoglPixelFormat format,
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GLenum *out_glintformat,
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GLenum *out_glformat,
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GLenum *out_gltype);
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/*
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* It may depend on the driver as to what texture targets may be used when
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* creating a foreign texture. E.g. OpenGL supports ARB_texture_rectangle
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* but GLES doesn't
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*/
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gboolean
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_cogl_texture_driver_allows_foreign_gl_target (GLenum gl_target);
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/*
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* glGenerateMipmap semantics may need to be emulated for some drivers. E.g. by
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* enabling auto mipmap generation an re-loading a number of known texels.
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*/
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void
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_cogl_texture_driver_gl_generate_mipmaps (GLenum texture_target);
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/*
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* The driver may impose constraints on what formats can be used to store
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* texture data read from textures. For example GLES currently only supports
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* RGBA_8888, and so we need to manually convert the data if the final
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* destination has another format.
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*/
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CoglPixelFormat
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_cogl_texture_driver_find_best_gl_get_data_format (
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CoglPixelFormat format,
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GLenum *closest_gl_format,
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GLenum *closest_gl_type);
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#endif /* __COGL_TEXTURE_DRIVER_H */
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