diff options
Diffstat (limited to 'src/til_fb.h')
| -rw-r--r-- | src/til_fb.h | 75 |
1 files changed, 61 insertions, 14 deletions
diff --git a/src/til_fb.h b/src/til_fb.h index 55e9b6c..3ebede7 100644 --- a/src/til_fb.h +++ b/src/til_fb.h @@ -1,26 +1,31 @@ #ifndef _TIL_FB_H #define _TIL_FB_H +#include <assert.h> #include <stdint.h> #include <string.h> #include "til_settings.h" #include "til_setup.h" +#include "til_util.h" + +typedef struct til_fb_fragment_t til_fb_fragment_t; /* All renderers should target fb_fragment_t, which may or may not represent * a full-screen mmap. Helpers are provided for subdividing fragments for * concurrent renderers. */ typedef struct til_fb_fragment_t { - uint32_t *buf; /* pointer to the first pixel in the fragment */ - unsigned x, y; /* absolute coordinates of the upper left corner of this fragment */ - unsigned width, height; /* width and height of this fragment */ - unsigned frame_width; /* width of the frame this fragment is part of */ - unsigned frame_height; /* height of the frame this fragment is part of */ - unsigned stride; /* number of 32-bit words from the end of one row to the start of the next */ - unsigned pitch; /* number of 32-bit words separating y from y + 1, including any padding */ - unsigned number; /* this fragment's number as produced by fragmenting */ - unsigned cleared:1; /* if this fragment has been cleared since last flip */ + til_fb_fragment_t *texture; /* optional source texture when drawing to this fragment */ + uint32_t *buf; /* pointer to the first pixel in the fragment */ + unsigned x, y; /* absolute coordinates of the upper left corner of this fragment */ + unsigned width, height; /* width and height of this fragment */ + unsigned frame_width; /* width of the frame this fragment is part of */ + unsigned frame_height; /* height of the frame this fragment is part of */ + unsigned stride; /* number of 32-bit words from the end of one row to the start of the next */ + unsigned pitch; /* number of 32-bit words separating y from y + 1, including any padding */ + unsigned number; /* this fragment's number as produced by fragmenting */ + unsigned cleared:1; /* if this fragment has been cleared since last flip */ } til_fb_fragment_t; /* This is a page handle object for page flip submission/life-cycle. @@ -70,12 +75,20 @@ static inline int til_fb_fragment_contains(til_fb_fragment_t *fragment, int x, i } +/* gets a pixel from the fragment, no bounds checking is performed. */ +static inline uint32_t til_fb_fragment_get_pixel_unchecked(til_fb_fragment_t *fragment, int x, int y) +{ + return fragment->buf[(y - fragment->y) * fragment->pitch + x - fragment->x]; +} + + /* puts a pixel into the fragment, no bounds checking is performed. */ static inline void til_fb_fragment_put_pixel_unchecked(til_fb_fragment_t *fragment, int x, int y, uint32_t pixel) { - uint32_t *pixels = fragment->buf + (y - fragment->y) * fragment->pitch; + if (fragment->texture) + pixel = til_fb_fragment_get_pixel_unchecked(fragment->texture, x, y); - pixels[x - fragment->x] = pixel; + fragment->buf[(y - fragment->y) * fragment->pitch + x - fragment->x] = pixel; } @@ -91,8 +104,31 @@ static inline int til_fb_fragment_put_pixel_checked(til_fb_fragment_t *fragment, } -/* fill a fragment with an arbitrary pixel */ -static inline void til_fb_fragment_fill(til_fb_fragment_t *fragment, uint32_t pixel) +/* copy a fragment, x,y,width,height are absolute coordinates within the frames, and will be clipped to the overlapping fragment areas */ +static inline void til_fb_fragment_copy(til_fb_fragment_t *dest, int x, int y, int width, int height, til_fb_fragment_t *src) +{ + int X = MAX(dest->x, src->x); + int Y = MAX(dest->y, src->y); + int W = MIN(dest->x + dest->width, src->x + src->width) - X; + int H = MIN(dest->y + dest->height, src->y + src->height) - Y; + + assert(W >= 0 && H >= 0); + + /* XXX FIXME TODO */ + /* XXX FIXME TODO */ + /* XXX FIXME TODO */ + /* this is PoC fast and nasty code, optimize this to at least bulk copy rows of pixels */ + /* XXX FIXME TODO */ + /* XXX FIXME TODO */ + /* XXX FIXME TODO */ + for (int v = 0; v < H; v++) { + for (int u = 0; u < W; u++) + til_fb_fragment_put_pixel_unchecked(dest, X + u, Y + v, til_fb_fragment_get_pixel_unchecked(src, X + u, Y + v)); + } +} + + +static inline void _til_fb_fragment_fill(til_fb_fragment_t *fragment, uint32_t pixel) { uint32_t *buf = fragment->buf; @@ -105,13 +141,24 @@ static inline void til_fb_fragment_fill(til_fb_fragment_t *fragment, uint32_t pi } +/* fill a fragment with an arbitrary pixel */ +static inline void til_fb_fragment_fill(til_fb_fragment_t *fragment, uint32_t pixel) +{ + if (!fragment->texture) + return _til_fb_fragment_fill(fragment, pixel); + + /* when a texture is present, pixel is ignored and instead sourced from fragment->texture->buf[y*pitch+x] */ + til_fb_fragment_copy(fragment, fragment->x, fragment->y, fragment->width, fragment->height, fragment->texture); +} + + /* clear a fragment */ static inline void til_fb_fragment_clear(til_fb_fragment_t *fragment) { if (fragment->cleared) return; - til_fb_fragment_fill(fragment, 0); + _til_fb_fragment_fill(fragment, 0); fragment->cleared = 1; } |