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lxdream.org :: lxdream/src/display.h
lxdream 0.9.1
released Jun 29
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filename src/display.h
changeset 805:b355f7b3ff2e
prev770:429ff505c450
next839:51f1c4195790
author nkeynes
date Thu Aug 07 23:53:17 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Add ability to bind a render buffer to a texture, with output going to the texture.
(RTT work in progress)
file annotate diff log raw
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/**
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 * $Id$
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 *
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 * The PC side of the video support (responsible for actually displaying / 
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 * rendering frames)
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program 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
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 * GNU General Public License for more details.
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 */
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#ifndef lxdream_display_H
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#define lxdream_display_H 1
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#define GL_GLEXT_PROTOTYPES 1
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#include <stdint.h>
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#include <stdio.h>
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#include <glib.h>
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#include "lxdream.h"
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#include "gettext.h"
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#ifdef APPLE_BUILD
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#include <OpenGL/gl.h>
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#include <OpenGL/glext.h>
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#else
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#include <GL/gl.h>
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#include <GL/glext.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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 * Supported colour formats. Note that BGRA4444 is only ever used for texture
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 * rendering (it's not valid for display purposes).
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 */
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#define COLFMT_BGRA1555  0
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#define COLFMT_RGB565    1
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#define COLFMT_BGRA4444  2
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#define COLFMT_YUV422    3 /* 8-bit YUV (texture source only) */
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#define COLFMT_BGR888    4 /* 24-bit BGR */
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#define COLFMT_BGRA8888  5
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#define COLFMT_INDEX4    6 /* 4 bit indexed colour (texture source only) */
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#define COLFMT_INDEX8    7 /* 8-bit indexed colour (texture source only) */
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#define COLFMT_BGR0888   8 /* 32-bit BGR */
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#define COLFMT_RGB888    9 /* 24-bit RGB (ie GL native) */
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struct colour_format {
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    GLint type, format, int_format;
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    int bpp;
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};
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extern struct colour_format colour_formats[];
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extern int colour_format_bytes[];
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/**
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 * Structure to hold pixel data held in GL buffers.
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 */
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struct render_buffer {
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    uint32_t width;
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    uint32_t height;
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    uint32_t rowstride;
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    uint32_t colour_format;
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    sh4addr_t address; /* Address buffer was rendered to, or -1 for unrendered */
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    uint32_t size; /* Size of buffer in bytes, must be width*height*bpp */
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    gboolean inverted;/* True if the buffer is upside down */
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    uint32_t scale;
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    GLuint tex_id;    /* texture bound to render buffer, if any (0 = none). 
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                       * The render buffer does not own the texture */
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    unsigned int buf_id; /* driver-specific buffer id, if applicable */
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    gboolean flushed; /* True if the buffer has been flushed to vram */
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};
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/**
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 * Structure to hold pixel data stored in pvr2 vram, as opposed to data in
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 * GL buffers.
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 */
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struct frame_buffer {
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    uint32_t width;
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    uint32_t height;
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    uint32_t rowstride;
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    uint32_t colour_format;
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    sh4addr_t address;
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    uint32_t size; /* Size of buffer in bytes, must be width*height*bpp */
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    gboolean inverted;/* True if the buffer is upside down */
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    unsigned char *data;
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};
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/**
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 * Core video driver - exports function to setup a GL context, as well as handle
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 * keyboard input and display resultant output.
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 */
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typedef struct display_driver {
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    char *name;
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    /**
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     * Short (<60 chars) description of the driver. This should be marked for
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     * localization.
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     */
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    char *description;
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    /**
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     * Initialize the driver. This is called only once at startup time, and
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     * is guaranteed to be called before any other methods.
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     * @return TRUE if the driver was successfully initialized, otherwise
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     * FALSE.
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     */
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    gboolean (*init_driver)(void);
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    /**
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     * Cleanly shutdown the driver. Normally only called at system shutdown
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     * time.
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     */
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    void (*shutdown_driver)(void);
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    /**
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     * Given a particular keysym, return the keycode associated with it.
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     * @param keysym The keysym to be resolved, ie "Tab"
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     * @return the display-specific keycode, or 0 if the keysym cannot
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     * be resolved.
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     */
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    uint16_t (*resolve_keysym)( const gchar *keysym );
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    /**
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     * Given a native system keycode, convert it to a dreamcast keyboard code.
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     */
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    uint16_t (*convert_to_dckeysym)( uint16_t keycode );
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    /**
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     * Given a device-specific event code, return the corresponding keysym.
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     * The string should be newly allocated (caller will free)
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     */
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    gchar *(*get_keysym_for_keycode)( uint16_t keycode );
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    /**
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     * Create a render target with the given width and height. If a texture ID
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     * is supplied (non-zero), the render buffer writes its output to that texture.
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     * @param tex_id 0 or a valid GL texture name which must have been initialized to
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     * the correct dimensions. 
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     */
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    render_buffer_t (*create_render_buffer)( uint32_t width, uint32_t height, GLuint tex_id );
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    /**
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     * Destroy the specified render buffer and release any associated
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     * resources.
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     */
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    void (*destroy_render_buffer)( render_buffer_t buffer );
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    /**
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     * Set the current rendering target to the specified buffer.
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     */
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    gboolean (*set_render_target)( render_buffer_t buffer );
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    /**
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     * Complete rendering and clear the current rendering target. If the 
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     * buffer has a bound texture, it will be updated if necessary.
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     */
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    void (*finish_render)( render_buffer_t buffer );
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    /**
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     * Load the supplied frame buffer into the given render buffer.
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     * Included here to allow driver-specific optimizations.
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     */
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    void (*load_frame_buffer)( frame_buffer_t frame, render_buffer_t render );
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    /**
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     * Display a single frame using a previously rendered GL buffer.
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     */
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    void (*display_render_buffer)( render_buffer_t buffer );
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    /**
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     * Display a single blanked frame using a fixed colour for the
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     * entire frame (specified in BGR888 format). 
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     */
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    void (*display_blank)( uint32_t rgb );
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    /**
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     * Copy the image data from the GL buffer to the target memory buffer,
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     * using the format etc from the buffer. This may force a glFinish()
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     * but does not invalidate the buffer.
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     * @param target buffer to fill with image data, which must be large enough
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     *  to accomodate the image.
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     * @param buffer Render buffer to read from.
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     * @param rowstride rowstride of the target data
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     * @param format colour format to output the data in.
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     */
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    gboolean (*read_render_buffer)( unsigned char *target, render_buffer_t buffer,
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            int rowstride, int format );
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} *display_driver_t;
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/**
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 * Print the configured video drivers to the output stream, one to a line.
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 */
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void print_display_drivers( FILE *out );
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display_driver_t get_display_driver_by_name( const char *name );
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gboolean display_set_driver( display_driver_t driver );
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extern uint32_t pvr2_frame_counter;
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extern display_driver_t display_driver;
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extern struct display_driver display_gtk_driver;
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extern struct display_driver display_osx_driver;
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extern struct display_driver display_null_driver;
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/****************** Input methods **********************/
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typedef void (*input_key_callback_t)( void *data, uint32_t value, uint32_t pressure, gboolean isKeyDown );
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/**
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 * Callback to receive mouse input events
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 * @param data pointer passed in at the time the hook was registered
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 * @param buttons bitmask of button states, where bit 0 is button 0 (left), bit 1 is button
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 * 1 (middle), bit 2 is button 2 (right) and so forth.
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 * @param x Horizontal movement since the last invocation (in relative mode) or window position 
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 * (in absolute mode).
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 * @param y Vertical movement since the last invocation (in relative mode) or window position
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 * (in absolute mode).
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 */
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typedef void (*input_mouse_callback_t)( void *data, uint32_t buttons, int32_t x, int32_t y );
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gboolean input_register_key( const gchar *keysym, input_key_callback_t callback,
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                             void *data, uint32_t value );
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void input_unregister_key( const gchar *keysym, input_key_callback_t callback,
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                           void *data, uint32_t value );
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/**
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 * Register a hook to receive all input events
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 */
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gboolean input_register_hook( input_key_callback_t callback, void *data );
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void input_unregister_hook( input_key_callback_t callback, void *data );
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/**
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 * Register a mouse event hook.
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 * @param relative TRUE if the caller wants relative mouse movement, FALSE for
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 * absolute mouse positioning. It's not generally possible to receive both at the same time.
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 */
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gboolean input_register_mouse_hook( gboolean relative, input_mouse_callback_t callback, void *data );
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void input_unregister_mouse_hook( input_mouse_callback_t callback, void *data );
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gboolean input_is_key_valid( const gchar *keysym );
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gboolean input_is_key_registered( const gchar *keysym );
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uint16_t input_keycode_to_dckeysym( uint16_t keycode );
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/********************** Display/Input methods ***********************/
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/**
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 * Auxilliary input driver - provides input separate to and in addition to the
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 * core UI/display. (primarily used for joystick devices)
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 */
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typedef struct input_driver {
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    const char *id; /* Short identifier to display in the UI for the device (eg "JS0" ) */
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    /**
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     * Given a particular keysym, return the keycode associated with it.
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     * @param keysym The keysym to be resolved, ie "Tab"
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     * @return the display-specific keycode, or 0 if the keysym cannot
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     * be resolved.
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     */
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    uint16_t (*resolve_keysym)( struct input_driver *driver, const gchar *keysym );
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    /**
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     * Given a device-specific event code, convert it to a dreamcast keyboard code.
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     * This is only required for actual keyboard devices, other devices should just
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     * leave this method NULL.
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     */
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    uint16_t (*convert_to_dckeysym)( struct input_driver *driver, uint16_t keycode );
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    /**
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     * Given a device-specific event code, return the corresponding keysym.
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     * The string should be newly allocated (caller will free)
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     */
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    gchar *(*get_keysym_for_keycode)( struct input_driver *driver, uint16_t keycode );
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    /**
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     * Destroy the input driver.
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     */
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    void (*destroy)( struct input_driver *driver );
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} *input_driver_t;       
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/**
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 * Register a new input driver (which must have a unique name)
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 * @param driver the driver to register
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 * @param max_keycode the highest possible keycode reported by the device
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 * @return TRUE on success, FALSE on failure (eg driver already registed).
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 */
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gboolean input_register_device( input_driver_t driver, uint16_t max_keycode );
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/**
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 * Determine if the system has an input driver with the given unique ID.
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 * @param id driver id to check
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 * @return TRUE if the device exists, otherwise FALSE
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 */
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gboolean input_has_device( const gchar *id );
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/**
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 * Unregister an input driver.
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 * @param driver the driver to unregister
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 * If the driver is not in fact registered, this function has no effect.
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 */
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void input_unregister_device( input_driver_t driver );
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/**
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 * Called from the UI to indicate that the emulation window is focused (ie
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 * able to receive input). This method is used to gate non-UI input devices -
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 * when the display is not focused, all input events will be silently ignored.
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 */
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void display_set_focused( gboolean has_focus );
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void input_event_keydown( input_driver_t input, uint16_t keycode, uint32_t pressure );
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void input_event_keyup( input_driver_t input, uint16_t keycode, uint32_t pressure );
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void input_event_mouse( uint32_t buttons, int32_t x_axis, int32_t y_axis );
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/**
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 * Given a keycode and the originating input driver, return the corresponding 
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 * keysym. The caller is responsible for freeing the string.
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 * @return a newly allocated string, or NULL of the keycode is unresolvable.
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 */
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gchar *input_keycode_to_keysym( input_driver_t driver, uint16_t keycode );
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typedef void (*display_keysym_callback_t)( void *data, const gchar *keysym );
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/**
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 * Set the keysym hook function (normally used by the UI to receive non-UI
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 * input events during configuration.
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 */
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void input_set_keysym_hook( display_keysym_callback_t hook, void *data );
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#ifdef __cplusplus
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}
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#endif
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#endif /* !lxdream_display_H */
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