97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
//---
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// gint:display-fx - fx9860g drawing functions
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//
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// This module is in charge of all monochrome rendering. The gray engine
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// has its own functions, but often relies on this module (because the
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// gray effect is created through two monochrome buffers).
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//---
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#ifndef GINT_DISPLAY_FX
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#define GINT_DISPLAY_FX
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#ifdef FX9860G
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <gint/defs/types.h>
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/* Dimensions of the VRAM */
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#define DWIDTH 128
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#define DHEIGHT 64
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/* gint VRAM address. This value must always point to a 4-aligned buffer of
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size 1024. Any function can use it freely to:
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- Use another video ram area (triple buffering or more, gray engine);
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- Implement additional drawing functions;
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- Store data when not drawing. */
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extern uint32_t *gint_vram;
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/* color_t - colors available for drawing
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The following colors are defined by the library:
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OPAQUE COLORS (override existing pixels)
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white, black - the usual thing
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light, dark - intermediate colors used with the gray engine
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OPERATORS (combine with existing pixels)
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none - leaves unchanged
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invert - inverts white <-> black, light <-> dark
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lighten - shifts black -> dark -> light -> white -> white
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darken - shifts white -> light -> dark -> black -> black
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Not all colors can be used with all functions. To avoid ambiguities, all
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functions explicitly indicate compatible colors. */
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typedef enum
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{
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/* Opaque colors */
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C_WHITE = 0,
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C_LIGHT = 1,
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C_DARK = 2,
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C_BLACK = 3,
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/* Monochrome operators */
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C_NONE = 4,
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C_INVERT = 5,
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/* Gray operators */
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C_LIGHTEN = 6,
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C_DARKEN = 7,
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} color_t;
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//---
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// Image rendering (bopti)
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//---
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/* bopti_image_t - image files encoded for bopti
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This format is the result of encoding images for bopti with the fxSDK's
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[fxconv] tool. The bopti routines can render it extremely fast, which makes
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it preferable over plain bitmaps if the images are never edited. */
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typedef struct
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{
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/* Image can only be rendered with the gray engine */
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uint gray :1;
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/* Left for future use */
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uint :3;
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/* Image profile (uniquely identifies a rendering function) */
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uint profile :4;
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/* Full width, in pixels */
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uint width :12;
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/* Full height, in pixels */
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uint height :12;
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/* Raw layer data */
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uint8_t data[];
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} GPACKED(4) bopti_image_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* FX9860G */
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#endif /* GINT_DISPLAY_FX */
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