Aren/toaruos
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

graphics: better approach to transformed blitting

Browse Source
This commit is contained in:
K. Lange 2021-08-14 08:54:04 +09:00
parent 3687793da6
commit f794dd6e51
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lib/graphics.c
View File

@ -729,8 +729,8 @@ static inline uint32_t linear_interp(uint32_t left, uint32_t right, uint16_t pr)
__attribute__((hot))
static inline uint32_t gfx_bilinear_interpolation(const sprite_t * tex, double u, double v) {
int x = (int)u;
int y = (int)v;
int x = (int)(u + 2.0) - 2;
int y = (int)(v + 2.0) - 2;
uint32_t ul = out_of_bounds(tex,x,y) ? 0 : SPRITE(tex,x,y);
uint32_t ur = out_of_bounds(tex,x+1,y) ? 0 : SPRITE(tex,x+1,y);
uint32_t ll = out_of_bounds(tex,x,y+1) ? 0 : SPRITE(tex,x,y+1);
@ -906,6 +906,8 @@ void draw_sprite_transform(gfx_context_t * ctx, const sprite_t * sprite, gfx_mat
int32_t _right = clamp(fmax(fmax(ul_x+1, ll_x+1), fmax(ur_x+1, lr_x+1)), 0, ctx->width);
int32_t _bottom = clamp(fmax(fmax(ul_y+1, ll_y+1), fmax(ur_y+1, lr_y+1)), 0, ctx->height);
sprite_t * scanline = create_sprite(_right - _left, 1, ALPHA_EMBEDDED);
uint8_t cliff[256];
for (int i = 0; i < 256; ++i) {
cliff[i] = alpha * i;
@ -917,10 +919,12 @@ void draw_sprite_transform(gfx_context_t * ctx, const sprite_t * sprite, gfx_mat
double u, v;
apply_matrix(_x, _y, inverse, &u, &v);
uint32_t n_color = gfx_bilinear_interpolation(sprite, u, v);
uint32_t f_color = rgba(cliff[_RED(n_color)], cliff[_GRE(n_color)], cliff[_BLU(n_color)], cliff[_ALP(n_color)]);
GFX(ctx,_x,_y) = alpha_blend_rgba(GFX(ctx,_x,_y), f_color);
SPRITE(scanline,_x - _left,0) = rgba(cliff[_RED(n_color)], cliff[_GRE(n_color)], cliff[_BLU(n_color)], cliff[_ALP(n_color)]);
}
draw_sprite(ctx,scanline,_left,_y);
}
sprite_free(scanline);
}
void draw_sprite_rotate(gfx_context_t * ctx, const sprite_t * sprite, int32_t x, int32_t y, float rotation, float alpha) {