wanp/townengine
2
1
Fork 0
Code Issues 6 Pull Requests Packages Projects Releases Wiki Activity

twn_draw: texture_region option for draw_billboard()

Browse Source
This commit is contained in:
veclavtalica
2025-02-15 22:42:14 +03:00
parent 793bd850f6
commit 5a83381ae1
5 changed files with 34 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
src/rendering/twn_billboards.c
View File

@ -9,9 +9,10 @@
#include <stb_ds.h>
void draw_billboard(const char *texture,
void draw_billboard(char const *texture,
Vec3 position,
Vec2 size,
Rect const *texture_region,
Color color,
bool cylindrical)
{
@ -30,8 +31,12 @@ void draw_billboard(const char *texture,
.cylindrical = cylindrical,
.position = position,
.size = size,
.texture_region_opt_set = texture_region != NULL,
};
if (texture_region)
billboard.texture_region_opt = *texture_region;
struct SpaceBillboard *billboards = (struct SpaceBillboard *)(void *)batch_p->value.primitives;
arrpush(billboards, billboard);
@ -81,10 +86,10 @@ void finally_draw_billboard_batch(struct MeshBatch const *batch,
const float xr = srcrect.x / dims.w;
const float yr = srcrect.y / dims.h;
const Vec2 uv0 = { xr, yr };
const Vec2 uv1 = { xr, yr + hr };
const Vec2 uv2 = { xr + wr, yr + hr };
const Vec2 uv3 = { xr + wr, yr };
const Vec2 uv0c = { xr, yr };
const Vec2 uv1c = { xr, yr + hr };
const Vec2 uv2c = { xr + wr, yr + hr };
const Vec2 uv3c = { xr + wr, yr };
for (size_t batch_n = 0; batch_n <= (primitives_len - 1) / QUAD_ELEMENT_BUFFER_LENGTH; batch_n++) {
@ -107,6 +112,20 @@ void finally_draw_billboard_batch(struct MeshBatch const *batch,
b = vec3_mul(right_minus_up, ((Vec3){billboard.size.x, billboard.size.y, billboard.size.x }));
}
Vec2 uv0, uv1, uv2, uv3;
if (billboard.texture_region_opt_set) {
uv0 = (Vec2){ (srcrect.x + billboard.texture_region_opt.x) / dims.w,
(srcrect.y + billboard.texture_region_opt.y) / dims.h };
uv1 = (Vec2){ (srcrect.x + billboard.texture_region_opt.x) / dims.w,
(srcrect.y + billboard.texture_region_opt.y + billboard.texture_region_opt.h) / dims.h };
uv2 = (Vec2){ (srcrect.x + billboard.texture_region_opt.x + billboard.texture_region_opt.w) / dims.w,
(srcrect.y + billboard.texture_region_opt.y + billboard.texture_region_opt.h) / dims.h };
uv3 = (Vec2){ (srcrect.x + billboard.texture_region_opt.x + billboard.texture_region_opt.w) / dims.w,
(srcrect.y + billboard.texture_region_opt.y) / dims.h };
} else {
uv0 = uv0c; uv1 = uv1c; uv2 = uv2c; uv3 = uv3c;
}
struct ElementIndexedBillboard const payload = {
/* flat shading is assumed, so we can skip setting the duplicates */
.c0 = billboard.color,

2
src/rendering/twn_draw_c.h
View File

@ -121,6 +121,8 @@ typedef struct SpaceBillboard {
Vec3 position;
Vec2 size;
Color color;
m_option_list(
Rect, texture_region )
// TextureKey texture; /* is assumed from other places */
bool cylindrical;
} SpaceBillboard;