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me.fier.engine
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Add function: engine_position_2d_to_tex

This commit is contained in:
Fierelier 2023-08-10 05:31:29 +02:00
parent 161bf5366c
commit fcdc55f3b2
3 changed files with 36 additions and 0 deletions
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13
src/helpers.c
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@ -73,3 +73,16 @@ void engine_rendertarget_draw_file(char * fpath) {
y += 1;
}
}
void engine_position_2d_to_tex(struct ENGINE_VECTOR_TEX * pos, float x, float y, int width, int height, char clamp) {
width = width - 1;
height = height - 1;
pos->x = round(((float)width*0.5) + (((float)width*x) * 0.5));
pos->y = round(((float)height*0.5) + (((float)height*y) * 0.5));
if (clamp == 1) {
if (pos->x < 0) { pos->x = 0; }
if (pos->x > width) { pos->x = width; }
if (pos->y < 0) { pos->y = 0; }
if (pos->y > height) { pos->y = height; }
}
}

15
src/lua_manual.c
View File

@ -80,6 +80,19 @@ int engine_luaf_3d_project(lua_State *L) {
return 2;
}
int engine_luaf_position_2d_to_tex(lua_State *L) {
float x = luaL_checknumber(L,1);
float y = luaL_checknumber(L,2);
int width = luaL_checknumber(L,3);
int height = luaL_checknumber(L,4);
int clamp = luaL_checknumber(L,5);
struct ENGINE_VECTOR_TEX pos;
engine_position_2d_to_tex(&pos,x,y,width,height,clamp);
lua_pushnumber(L,pos.x);
lua_pushnumber(L,pos.y);
return 2;
}
void engine_lua_init_manual() {
lua_pushcfunction(engine_lua_state,engine_luaf_lua_event_get_data);
lua_setglobal (engine_lua_state,"engine_lua_event_get_data");
@ -93,4 +106,6 @@ void engine_lua_init_manual() {
lua_setglobal (engine_lua_state,"engine_3d_rotate_position");
lua_pushcfunction(engine_lua_state,engine_luaf_3d_project);
lua_setglobal (engine_lua_state,"engine_3d_project");
lua_pushcfunction(engine_lua_state,engine_luaf_position_2d_to_tex);
lua_setglobal (engine_lua_state,"engine_position_2d_to_tex");
}

8
src/values/functions.toml
View File

@ -89,6 +89,14 @@ arguments = ["char *"]
argNames = ["fpath"]
description = "Draw a file into the target."
# POSITION
[engine_position_2d_to_tex]
type = "void"
arguments = ["struct ENGINE_VECTOR_TEXTURE *","float","float","int", "int", "char"]
argNames = ["pos", "x", "y", "width","height","clamp"]
description = "Convert 2D coordinates (range -1 = top/left, 1 = bottom/right) to ENGINE_VECTOR_TEXTURE. If clamp is set to 1, coordinates may not be less than 0, or more than width-1/height-1. Output is put into pos pointer. Pointer not required in Lua."
lua = "manual"
# TIME
[engine_time_sleep]
type = "void"