104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
//---
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// render-fx - Internal definitions for the display module on fx9860g
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//---
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#ifndef RENDER_FX
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#define RENDER_FX
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#include <gint/defs/types.h>
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#include <gint/display.h>
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#include "bopti-asm.h"
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/* masks(): Compute the vram masks for a given rectangle
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Since the VRAM is line-based with four uin32_t elements per row, we can
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execute any operation on a rectangle by running it on each set of four
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uint32_t elements.
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This function calculates four uint32_t values and stores them in @mask. Each
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of the 128 bits in this array represents a column of the screen, and the bit
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of column c is 1 iff x1 <= c <= x2.
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These masks can then be and-ed/or-ed/anything on the VRAM to draw.
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@x1 @x2 Targeted screen range, horizontally (both included)
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@masks Stores the result of the function (four uint32_t values) */
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void masks(int x1, int x2, uint32_t *masks);
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/* bopti_clip(): Clip a bounding box to image and VRAM
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@img Image encoded by [fxconv]
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@rbox Rendering box */
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int bopti_clip(bopti_image_t const *img, struct rbox *rbox);
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/* bopti_render(): Render a bopti image
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Copies an image into the VRAM. This function does not perform clipping;
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use bopti_clip() on the rbox before calling it if needed.
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@img Image encoded by [fxconv]
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@rbox Rendering box (may or may not be clipped)
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@v1 @v2 VRAMs (gray rendering is used if v2 != NULL) */
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void bopti_render(bopti_image_t const *img, struct rbox *rbox, uint32_t *v1,
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uint32_t *v2);
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/* bopti_render_scsp(): Single-column single-position image renderer
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This function is a specialized version of bopti_render() that can be used
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when only a single column of the source image is used (all pixels to be
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rendered are in a single 32-aligned 32-wide pixel column of the source) and
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a single position of the VRAM is used (all pixels to be rendered end up in a
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single 32-aligned 32-wide pixel column of the VRAM). */
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void bopti_render_scsp(bopti_image_t const *img, struct rbox *rbox,
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uint32_t *v1, uint32_t *v2);
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//---
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// Alternate rendering modes
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//---
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/* The gray engine overrides the rendering functions by specifying a set of
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alternate primitives that are suited to work with two VRAMs. To avoid
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linking with them when the gray engine is not used, the display module
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exposes a global state in the form of a struct rendering_mode and the gray
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engine modifies that state when it runs. */
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struct rendering_mode
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{
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/* Because the gray engine still has business to do after the call to
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dgray(DGRAY_OFF), the original dupdate() is made to execute after
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the replacement one if the replacement one returns 1. */
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int (*dupdate)(void);
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/* Area rendering */
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void (*dclear)(color_t color);
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void (*drect)(int x1, int y1, int x2, int y2, color_t color);
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/* Point rendering */
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void (*dpixel)(int x, int y, color_t color);
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void (*gint_dhline)(int x1, int x2, int y, int color);
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void (*gint_dvline)(int y1, int y2, int x, int color);
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/* Text and image rendering */
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void (*dtext_opt)
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(int x, int y, int fg, int bg, int halign, int valign,
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char const *str, int size);
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void (*dsubimage)
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(bopti_image_t const *image, struct rbox *r, int flags);
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};
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/* The alternate rendering mode pointer (initially NULL)*/
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extern struct rendering_mode const *dmode;
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/* These are the corresponding gray rendering functions */
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int gupdate(void);
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void gclear(color_t color);
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void grect(int x1, int y1, int x2, int y2, color_t color);
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void gpixel(int x, int y, color_t color);
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void gint_ghline(int x1, int x2, int y, int color);
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void gint_gvline(int y1, int y2, int x, int color);
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void gtext_opt(int x, int y, int fg, int bg, int halign, int valign,
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char const *str, int size);
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void gsubimage(bopti_image_t const *image, struct rbox *r, int flags);
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/* Short macro to call the alternate rendering function when available */
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#define DMODE_OVERRIDE(func, ...) \
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if(dmode && dmode->func) { \
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dmode->func(__VA_ARGS__); \
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return; \
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}
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#endif /* RENDER_FX */
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