diff options
Diffstat (limited to 'src/primitives.c')
| -rw-r--r-- | src/primitives.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/primitives.c b/src/primitives.c new file mode 100644 index 0000000..d499248 --- /dev/null +++ b/src/primitives.c @@ -0,0 +1,223 @@ +#include "primitives.h" + +static int honey_mesh_lua_plane(lua_State* L) +{ + float width, height; + honey_lua_parse_arguments(L, 2, + HONEY_NUMBER, &width, + HONEY_NUMBER, &height); + + honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh)); + if (honey_mesh_new_textured_plane(mesh, width, height) != HONEY_OK) { + lua_pushstring(L, "error encountered while building plane"); + lua_error(L); + } + return 1; +} + +static int honey_mesh_lua_cube(lua_State* L) +{ + float width, height, depth; + honey_lua_parse_arguments(L, 3, + HONEY_NUMBER, &width, + HONEY_NUMBER, &height, + HONEY_NUMBER, &depth); + + honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh)); + if (honey_mesh_new_textured_cube(mesh, width, height, depth) != HONEY_OK) { + lua_pushstring(L, "error encountered while building plane"); + lua_error(L); + } + return 1; +} + +void honey_setup_primitives(lua_State* L) +{ + honey_lua_element primitive_elements[] = { + { "plane", HONEY_FUNCTION, { .function = honey_mesh_lua_plane } }, + { "cube", HONEY_FUNCTION, { .function = honey_mesh_lua_cube } }, + }; + + honey_lua_create_table(L, primitive_elements, 2); +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +honey_result honey_mesh_new_textured_plane(honey_mesh* mesh, + float width, + float height) { + float x0 = 0; + float y0 = 0; + float x1 = width; + float y1 = height; + + float vertices[] = { + /* position normal uv */ + x0, y0, 0, 0, 0, 1, 0, 0, + x1, y0, 0, 0, 0, 1, 1, 0, + x0, y1, 0, 0, 0, 1, 0, 1, + x1, y1, 0, 0, 0, 1, 1, 1 }; + + unsigned int indices[] = { + 0, 1, 2, + 3, 2, 1 }; + + unsigned int attrib_sizes[] = { 3, 3, 2 }; + + honey_result result = honey_mesh_new(mesh, + vertices, 4, + 3, attrib_sizes, + indices, 6); + return result; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +honey_result honey_mesh_new_cube(honey_mesh* mesh, + float width, + float height, + float depth) { + float x0 = 0; + float y0 = 0; + float z0 = 0; + + float x1 = width; + float y1 = height; + float z1 = depth; + + float vertices[] = { + /* position normal tex coord */ + /* back face */ + x0, y0, z0, 0, 0, -1, + x1, y0, z0, 0, 0, -1, + x0, y1, z0, 0, 0, -1, + x1, y1, z0, 0, 0, -1, + + /* front face */ + x0, y0, z1, 0, 0, 1, + x1, y0, z1, 0, 0, 1, + x0, y1, z1, 0, 0, 1, + x1, y1, z1, 0, 0, 1, + + /* left face */ + x0, y0, z0, -1, 0, 0, + x0, y1, z0, -1, 0, 0, + x0, y0, z1, -1, 0, 0, + x0, y1, z1, -1, 0, 0, + + /* right face */ + x1, y0, z0, 1, 0, 0, + x1, y1, z0, 1, 0, 0, + x1, y0, z1, 1, 0, 0, + x1, y1, z1, 1, 0, 0, + + /* bottom face */ + x0, y0, z0, 0, -1, 0, + x1, y0, z0, 0, -1, 0, + x0, y0, z1, 0, -1, 0, + x1, y0, z1, 0, -1, 0, + + /* top face */ + x0, y1, z0, 0, 1, 0, + x1, y1, z0, 0, 1, 0, + x0, y1, z1, 0, 1, 0, + x1, y1, z1, 0, 1, 0 }; + + unsigned int indices[] = { + 0, 1, 2, + 1, 2, 3, + 4, 5, 6, + 5, 6, 7, + 8, 9, 10, + 9, 10, 11, + 12, 13, 14, + 13, 14, 15, + 16, 17, 18, + 17, 18, 19, + 20, 21, 22, + 21, 22, 23 }; + + unsigned int attrib_sizes[] = { 3, 3 }; + + honey_result result = honey_mesh_new(mesh, + vertices, 24, + 2, attrib_sizes, + indices, 36); + + return result; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +honey_result honey_mesh_new_textured_cube(honey_mesh* mesh, + float width, + float height, + float depth) { + float x0 = 0; + float y0 = 0; + float z0 = 0; + + float x1 = width; + float y1 = height; + float z1 = depth; + + float vertices[] = { + /* position normal tex coord */ + /* back face */ + x0, y0, z0, 0, 0, -1, 0, 0, + x1, y0, z0, 0, 0, -1, 1, 0, + x0, y1, z0, 0, 0, -1, 0, 1, + x1, y1, z0, 0, 0, -1, 1, 1, + + /* front face */ + x0, y0, z1, 0, 0, 1, 0, 0, + x1, y0, z1, 0, 0, 1, 1, 0, + x0, y1, z1, 0, 0, 1, 0, 1, + x1, y1, z1, 0, 0, 1, 1, 1, + + /* left face */ + x0, y0, z0, -1, 0, 0, 0, 0, + x0, y1, z0, -1, 0, 0, 1, 0, + x0, y0, z1, -1, 0, 0, 0, 1, + x0, y1, z1, -1, 0, 0, 1, 1, + + /* right face */ + x1, y0, z0, 1, 0, 0, 0, 0, + x1, y1, z0, 1, 0, 0, 1, 0, + x1, y0, z1, 1, 0, 0, 0, 1, + x1, y1, z1, 1, 0, 0, 1, 1, + + /* bottom face */ + x0, y0, z0, 0, -1, 0, 0, 0, + x1, y0, z0, 0, -1, 0, 1, 0, + x0, y0, z1, 0, -1, 0, 0, 1, + x1, y0, z1, 0, -1, 0, 1, 1, + + /* top face */ + x0, y1, z0, 0, 1, 0, 0, 0, + x1, y1, z0, 0, 1, 0, 1, 0, + x0, y1, z1, 0, 1, 0, 0, 1, + x1, y1, z1, 0, 1, 0, 1, 1 }; + + unsigned int indices[] = { + 0, 1, 2, + 1, 2, 3, + 4, 5, 6, + 5, 6, 7, + 8, 9, 10, + 9, 10, 11, + 12, 13, 14, + 13, 14, 15, + 16, 17, 18, + 17, 18, 19, + 20, 21, 22, + 21, 22, 23 }; + + unsigned int attrib_sizes[] = { 3, 3, 2 }; + + honey_result result; + result = honey_mesh_new(mesh, vertices, 24, + 3, attrib_sizes, + indices, 36); + return result; +} |