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libobs/graphics: Add gs_draw_sprite_subregion function

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Allows rendering only a subregion of a specific sprite.
This commit is contained in:
jp9000 2016-09-19 06:38:05 -07:00
parent b2fd5ca25e
commit 0bc0db1207
2 changed files with 60 additions and 0 deletions
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57
libobs/graphics/graphics.c
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@ -962,6 +962,32 @@ static inline void build_sprite_norm(struct gs_vb_data *data, float fcx,
build_sprite(data, fcx, fcy, start_u, end_u, start_v, end_v);
}
static inline void build_subsprite_norm(struct gs_vb_data *data,
float fsub_x, float fsub_y, float fsub_cx, float fsub_cy,
float fcx, float fcy, uint32_t flip)
{
float start_u, end_u;
float start_v, end_v;
if ((flip & GS_FLIP_U) == 0) {
start_u = fsub_x / fcx;
end_u = (fsub_x + fsub_cx) / fcx;
} else {
start_u = (fsub_x + fsub_cx) / fcx;
end_u = fsub_x / fcx;
}
if ((flip & GS_FLIP_V) == 0) {
start_v = fsub_y / fcy;
end_v = (fsub_y + fsub_cy) / fcy;
} else {
start_v = (fsub_y + fsub_cy) / fcy;
end_v = fsub_y / fcy;
}
build_sprite(data, fsub_cx, fsub_cy, start_u, end_u, start_v, end_v);
}
static inline void build_sprite_rect(struct gs_vb_data *data, gs_texture_t *tex,
float fcx, float fcy, uint32_t flip)
{
@ -1011,6 +1037,37 @@ void gs_draw_sprite(gs_texture_t *tex, uint32_t flip, uint32_t width,
gs_draw(GS_TRISTRIP, 0, 0);
}
void gs_draw_sprite_subregion(gs_texture_t *tex, uint32_t flip,
uint32_t sub_x, uint32_t sub_y,
uint32_t sub_cx, uint32_t sub_cy)
{
graphics_t *graphics = thread_graphics;
float fcx, fcy;
struct gs_vb_data *data;
if (tex) {
if (gs_get_texture_type(tex) != GS_TEXTURE_2D) {
blog(LOG_ERROR, "A sprite must be a 2D texture");
return;
}
}
fcx = (float)gs_texture_get_width(tex);
fcy = (float)gs_texture_get_height(tex);
data = gs_vertexbuffer_get_data(graphics->sprite_buffer);
build_subsprite_norm(data,
(float)sub_x, (float)sub_y,
(float)sub_cx, (float)sub_cy,
fcx, fcy, flip);
gs_vertexbuffer_flush(graphics->sprite_buffer);
gs_load_vertexbuffer(graphics->sprite_buffer);
gs_load_indexbuffer(NULL);
gs_draw(GS_TRISTRIP, 0, 0);
}
void gs_draw_cube_backdrop(gs_texture_t *cubetex, const struct quat *rot,
float left, float right, float top, float bottom, float znear)
{

3
libobs/graphics/graphics.h
View File

@ -525,6 +525,9 @@ EXPORT uint8_t *gs_create_texture_file_data(const char *file,
EXPORT void gs_draw_sprite(gs_texture_t *tex, uint32_t flip, uint32_t width,
uint32_t height);
EXPORT void gs_draw_sprite_subregion(gs_texture_t *tex, uint32_t flip,
uint32_t x, uint32_t y, uint32_t cx, uint32_t cy);
EXPORT void gs_draw_cube_backdrop(gs_texture_t *cubetex, const struct quat *rot,
float left, float right, float top, float bottom, float znear);