Aegisub/src/video_out_gl.h

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// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
/// @file video_out_gl.h
/// @brief OpenGL based video renderer
/// @ingroup video
///
#include <libaegisub/exception.h>
#include <vector>
struct VideoFrame;
/// @class VideoOutGL
/// @brief OpenGL based video renderer
class VideoOutGL {
struct TextureInfo;
/// The maximum texture size supported by the user's graphics card
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int maxTextureSize = 0;
/// Whether rectangular textures are supported by the user's graphics card
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bool supportsRectangularTextures = false;
/// The internalformat to use
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int internalFormat = 0;
/// The frame height which the texture grid has been set up for
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int frameWidth = 0;
/// The frame width which the texture grid has been set up for
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int frameHeight = 0;
/// The frame format which the texture grid has been set up for
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GLenum frameFormat = 0;
/// Whether the grid is set up for flipped video
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bool frameFlipped = false;
/// List of OpenGL texture ids used in the grid
std::vector<GLuint> textureIdList;
/// List of precalculated texture display information
std::vector<TextureInfo> textureList;
/// OpenGL display list which draws the frames
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GLuint dl = 0;
/// The total texture count
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int textureCount = 0;
/// The number of rows of textures
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int textureRows = 0;
/// The number of columns of textures
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int textureCols = 0;
void DetectOpenGLCapabilities();
void InitTextures(int width, int height, GLenum format, int bpp, bool flipped);
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VideoOutGL(const VideoOutGL &) = delete;
VideoOutGL& operator=(const VideoOutGL&) = delete;
public:
/// @brief Set the frame to be displayed when Render() is called
/// @param frame The frame to be displayed
void UploadFrameData(VideoFrame const& frame);
/// @brief Render a frame
/// @param x Bottom left x coordinate
/// @param y Bottom left y coordinate
/// @param width Width in pixels of viewport
/// @param height Height in pixels of viewport
void Render(int x, int y, int width, int height);
VideoOutGL();
~VideoOutGL();
};
/// Base class for all exceptions thrown by VideoOutGL
DEFINE_EXCEPTION(VideoOutException, agi::Exception);
/// An OpenGL error occurred while uploading or displaying a frame
class VideoOutRenderException final : public VideoOutException {
public:
VideoOutRenderException(const char *func, int err)
: VideoOutException(std::string(func) + " failed with error code " + std::to_string(err))
{ }
};
/// An OpenGL error occurred while setting up the video display
class VideoOutInitException final : public VideoOutException {
public:
VideoOutInitException(const char *func, int err)
: VideoOutException(std::string(func) + " failed with error code " + std::to_string(err))
{ }
VideoOutInitException(const char *err) : VideoOutException(err) { }
};