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/* |
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* video.h - Video/graphics emulation |
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* |
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* Basilisk II (C) 1997-2001 Christian Bauer |
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* Basilisk II (C) 1997-2002 Christian Bauer |
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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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#include <vector> |
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#ifndef NO_STD_NAMESPACE |
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using std::vector; |
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#endif |
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/* |
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Some of the terminology here is completely frelled. In Basilisk II, a |
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"video mode" refers to a combination of resolution and color depth, and |
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this information is stored in a video_mode structure. In Apple |
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documentation, a "mode" historically refers to the color depth only |
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(because old Macs had fixed-frequency monitors and could not change the |
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resolution). These "modes" are assigned a number (0x80, 0x81, etc.), |
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which we here call "Apple mode". When Macs learned how to deal with |
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multiscan monitors, Apple introduced another type of "mode", also having |
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numbers starting from 0x80 but refrerring to the resolution and/or video |
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timing of the display (it's possible to have two modes with the same |
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dimension but different refresh rates). We call this a "resolution ID". |
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The combination of "Apple mode" and "ID" corresponds to a Basilisk II |
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"video mode". To make the confusion worse, the video driver control call |
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that sets the color depth is called "SetMode" while the one that sets |
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both depth and resolution is "SwitchMode"... |
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*/ |
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|
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// Color depth codes |
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enum video_depth { |
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VDEPTH_1BIT, // 2 colors |
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VDEPTH_32BIT // "Millions" |
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}; |
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inline uint16 DepthToAppleMode(video_depth depth) |
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{ |
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return depth + 0x80; |
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} |
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|
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inline video_depth AppleModeToDepth(uint16 mode) |
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{ |
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return video_depth(mode - 0x80); |
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} |
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// 1, 2, 4 and 8 bit depths use a color palette |
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inline bool IsDirectMode(video_depth depth) |
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{ |
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return depth == VDEPTH_16BIT || depth == VDEPTH_32BIT; |
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} |
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inline bool IsDirectMode(uint16 mode) |
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{ |
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return IsDirectMode(AppleModeToDepth(mode)); |
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} |
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// Return the depth code that corresponds to the specified bits-per-pixel value |
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inline video_depth DepthModeForPixelDepth(int depth) |
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{ |
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switch (depth) { |
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} |
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} |
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// Return a bytes-per-row value that assumes no padding for specified depth and pixel width |
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// Return a bytes-per-row value (assuming no padding) for the specified depth and pixel width |
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inline uint32 TrivialBytesPerRow(uint32 width, video_depth depth) |
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{ |
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switch (depth) { |
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case VDEPTH_8BIT: return width; |
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case VDEPTH_16BIT: return width * 2; |
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case VDEPTH_32BIT: return width * 4; |
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default: return width; |
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} |
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} |
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// Description of one video mode |
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/* |
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You are not completely free in your selection of depth/resolution |
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combinations: |
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1) the lowest supported color depth must be available in all |
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resolutions |
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2) if one resolution provides a certain color depth, it must also |
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provide all lower supported depths |
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For example, it is possible to have this set of modes: |
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640x480 @ 8 bit |
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640x480 @ 32 bit |
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800x600 @ 8 bit |
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800x600 @ 32 bit |
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1024x768 @ 8 bit |
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|
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But this is not possible (violates rule 1): |
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640x480 @ 8 bit |
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800x600 @ 8 bit |
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1024x768 @ 1 bit |
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And neither is this (violates rule 2, 640x480 @ 16 bit is missing): |
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640x480 @ 8 bit |
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640x480 @ 32 bit |
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800x600 @ 8 bit |
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800x600 @ 16 bit |
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1024x768 @ 8 bit |
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*/ |
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|
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// Description of a video mode |
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struct video_mode { |
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uint32 x; // X size of screen (pixels) |
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uint32 y; // Y size of screen (pixels) |
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uint32 resolution_id; // Resolution ID (should be >= 0x80 and uniquely identify the sets of modes with the same X/Y size) |
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uint32 bytes_per_row; // Bytes per row of frame buffer |
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video_depth depth; // Color depth (see definitions above) |
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uint32 bytes_per_row; // Bytes per row of frame buffer |
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uint32 user_data; // Free for use by platform-specific code |
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}; |
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inline bool IsDirectMode(const video_mode &mode) |
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return IsDirectMode(mode.depth); |
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} |
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// List of all supported video modes |
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extern std::vector<video_mode> VideoModes; |
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// Description for one (possibly virtual) monitor |
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struct monitor_desc { |
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uint32 mac_frame_base; // Mac frame buffer address |
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video_mode mode; // Currently selected video mode description |
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// Mac video driver per-display private variables (opaque) |
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struct video_locals; |
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// Abstract base class representing one (possibly virtual) monitor |
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// ("monitor" = rectangular display with a contiguous frame buffer) |
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class monitor_desc { |
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public: |
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monitor_desc(const vector<video_mode> &available_modes, video_depth default_depth, uint32 default_id); |
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virtual ~monitor_desc() {} |
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// Get Mac slot ID number |
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uint8 get_slot_id(void) const {return slot_id;} |
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// Get current Mac frame buffer base address |
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uint32 get_mac_frame_base(void) const {return mac_frame_base;} |
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// Set Mac frame buffer base address (called from switch_to_mode()) |
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void set_mac_frame_base(uint32 base) {mac_frame_base = base;} |
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// Get current video mode |
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const video_mode &get_current_mode(void) const {return *current_mode;} |
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// Get Apple mode id for given depth |
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uint16 depth_to_apple_mode(video_depth depth) const {return apple_mode_for_depth[depth];} |
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// Get current color depth |
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uint16 get_apple_mode(void) const {return depth_to_apple_mode(current_mode->depth);} |
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// Get bytes-per-row value for specified resolution/depth |
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// (if the mode isn't supported, make a good guess) |
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uint32 get_bytes_per_row(video_depth depth, uint32 id) const; |
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// Check whether a mode with the specified depth exists on this display |
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bool has_depth(video_depth depth) const; |
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// Mac video driver functions |
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int16 driver_open(void); |
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int16 driver_control(uint16 code, uint32 param, uint32 dce); |
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int16 driver_status(uint16 code, uint32 param); |
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protected: |
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vector<video_mode> modes; // List of supported video modes |
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vector<video_mode>::const_iterator current_mode; // Currently selected video mode |
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uint32 mac_frame_base; // Mac frame buffer address for current mode |
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// Mac video driver per-display private variables/functions |
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private: |
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// Check whether the specified resolution ID is one of the supported resolutions |
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bool has_resolution(uint32 id) const; |
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// Return iterator signifying "invalid mode" |
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vector<video_mode>::const_iterator invalid_mode(void) const {return modes.end();} |
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// Find specified mode (depth/resolution) (or invalid_mode() if not found) |
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vector<video_mode>::const_iterator find_mode(uint16 apple_mode, uint32 id) const; |
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// Find maximum supported depth for given resolution ID |
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video_depth max_depth_of_resolution(uint32 id) const; |
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// Get X/Y size of specified resolution |
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void get_size_of_resolution(uint32 id, uint32 &x, uint32 &y) const; |
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// Set palette to 50% gray |
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void set_gray_palette(void); |
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// Load gamma-corrected black-to-white ramp to palette for direct-color mode |
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void load_ramp_palette(void); |
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// Allocate gamma table of specified size |
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bool allocate_gamma_table(int size); |
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// Set gamma table (0 = build linear ramp) |
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bool set_gamma_table(uint32 user_table); |
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// Switch video mode |
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void switch_mode(vector<video_mode>::const_iterator it, uint32 param, uint32 dce); |
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uint8 slot_id; // NuBus slot ID number |
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static uint8 next_slot_id; // Next available slot ID |
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uint8 palette[256 * 3]; // Color palette, 256 entries, RGB |
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bool luminance_mapping; // Luminance mapping on/off |
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bool interrupts_enabled; // VBL interrupts on/off |
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bool dm_present; // We received a GetVideoParameters call, so the Display Manager seems to be present |
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uint32 gamma_table; // Mac address of gamma table |
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int alloc_gamma_table_size; // Allocated size of gamma table |
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uint16 current_apple_mode; // Currently selected depth/resolution |
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uint32 current_id; |
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uint16 preferred_apple_mode; // Preferred depth/resolution |
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uint32 preferred_id; |
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uint32 slot_param; // Mac address of Slot Manager parameter block |
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// For compatibility reasons with older (pre-Display Manager) versions of |
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// MacOS, the Apple modes must start at 0x80 and be contiguous. Therefore |
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// we maintain an array to map the depth codes to the corresponding Apple |
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// mode. |
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uint16 apple_mode_for_depth[6]; |
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// The following functions are implemented by platform-specific code |
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public: |
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// Called by the video driver to switch the video mode on this display |
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// (must call set_mac_frame_base()) |
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virtual void switch_to_current_mode(void) = 0; |
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// Called by the video driver to set the color palette (in indexed modes) |
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// or the gamma table (in direct modes) |
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virtual void set_palette(uint8 *pal, int num) = 0; |
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}; |
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extern monitor_desc VideoMonitor; // Description of the main monitor, set by VideoInit() |
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// Vector of pointers to available monitor descriptions, filled by VideoInit() |
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extern vector<monitor_desc *> VideoMonitors; |
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extern int16 VideoDriverOpen(uint32 pb, uint32 dce); |
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extern int16 VideoDriverControl(uint32 pb, uint32 dce); |
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extern int16 VideoDriverStatus(uint32 pb, uint32 dce); |
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// System specific and internal functions/data |
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extern bool VideoInit(bool classic); |
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extern void VideoExit(void); |
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extern void VideoInterrupt(void); |
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extern void VideoRefresh(void); |
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extern void video_switch_to_mode(const video_mode &mode); |
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extern void video_set_palette(uint8 *pal); |
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#endif |
