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#include "model.h"
#include "gldefs.h"
#include "macros.h"
#include "sys.h"
#include <string.h>
mat
get_model_matrix(v3 pos, v3 angles, v3 scale)
{
mat result = make_scale(scale);
result = rotate_mat(result, angles);
result = translate_mat(result, pos);
return result;
/*
mat translate = make_scale(transform.scale);
mat rotate = make_rotate(transform.scale);
mat scale = make_translate(transform.scale);
return mulmat(mulmat(translate, rotate), scale);
*/
}
static void
init_mesh_buffers(struct mesh *mesh)
{
gl_gen_vertex_arrays(1, &mesh->vao);
gl_gen_buffers(1, &mesh->vbo);
gl_gen_buffers(1, &mesh->ebo);
gl_bind_vertex_array(mesh->vao);
gl_bind_buffer(gl_array_buffer, mesh->vbo);
gl_bind_buffer(gl_element_array_buffer, mesh->ebo);
u64 size = mesh->nvertices * sizeof(struct vertex);
gl_buffer_data(gl_array_buffer, size, mesh->vertices, gl_static_draw);
size = mesh->nindices * sizeof(u32);
gl_buffer_data(gl_element_array_buffer, size, mesh->indices, gl_static_draw);
u64 vertex_size = sizeof(struct vertex);
gl_enable_vertex_attrib_array(pos_loc);
gl_vertex_attrib_pointer(pos_loc, 3, gl_float, 0, vertex_size,
(void *)offsetof(struct vertex, pos));
gl_enable_vertex_attrib_array(norm_loc);
gl_vertex_attrib_pointer(norm_loc, 3, gl_float, 0, vertex_size,
(void *)offsetof(struct vertex, norm));
gl_enable_vertex_attrib_array(texc_loc);
gl_vertex_attrib_pointer(texc_loc, 2, gl_float, 0, vertex_size,
(void*)offsetof(struct vertex, texc));
gl_bind_buffer(gl_element_array_buffer, 0);
gl_bind_buffer(gl_array_buffer, 0);
gl_bind_vertex_array(0);
}
struct mesh
init_mesh(v3 pos, v3 angles, v3 scale,
i32 nvertices, struct vertex *vertices,
i32 nindices, u32 *indices, struct texture *texture)
{
struct mesh mesh = {0};
mesh.pos = pos;
mesh.angles = angles;
mesh.scale = scale;
mesh.nvertices = nvertices;
mesh.vertices = vertices;
mesh.nindices = nindices;
mesh.indices = indices;
mesh.texture = texture;
init_mesh_buffers(&mesh);
return mesh;
}
void
clear_mesh(struct mesh *mesh)
{
gl_bind_vertex_array(mesh->vao);
gl_disable_vertex_attrib_array(pos_loc);
gl_disable_vertex_attrib_array(norm_loc);
gl_disable_vertex_attrib_array(texc_loc);
gl_bind_vertex_array(0);
gl_delete_vertex_arrays(1, &mesh->vao);
gl_delete_buffers(1, &mesh->vbo);
gl_delete_buffers(1, &mesh->ebo);
}
struct mesh
gen_quad(struct arena *arena, v3 pos, v3 angles, v3 scale, f32 width, f32 height)
{
if (width < 0.1f)
info("quad width less than 0.1... no");
width = max(0.1f, width);
if (height < 0.1f)
info("quad height less than 0.1... no");
height = max(0.1f, height);
if (scale.x < 0.1f || scale.y < 0.1f || scale.z < 0.1f)
info("quad scale less than 0.1... no");
scale = maxv3((v3){0.1f, 0.1f, 0.1f}, scale);
i32 nvertices = 4;
u64 size = nvertices * sizeof(struct vertex);
struct vertex *vertices = push_arena(arena, size);
memset(vertices, 0, size);
vertices[0].pos = (v3){-width/2.0f, -height/2.0f, 0.0f};
vertices[1].pos = (v3){-width/2.0f, height/2.0f, 0.0f};
vertices[1].texc = (v2){0.0f, height};
vertices[2].pos = (v3){width/2.0f, -height/2.0f, 0.0f};
vertices[2].texc = (v2){width, 0.0f};
vertices[3].pos = (v3){width/2.0f, height/2.0f, 0.0f};
vertices[3].texc = (v2){width, height};
i32 nindices = 6;
size = nindices * sizeof(u32);
u32 *indices = push_arena(arena, size);
indices[0] = 0;
indices[1] = 1;
indices[2] = 3;
indices[3] = 0;
indices[4] = 2;
indices[5] = 3;
return init_mesh(pos, angles, scale, nvertices, vertices, nindices, indices, 0);
}
struct model
init_model(v3 pos, v3 angles, v3 scale, i32 nmeshes, struct mesh *meshes)
{
struct model model = {0};
model.pos = pos;
model.angles = angles;
model.scale = scale;
model.nmeshes = nmeshes;
model.meshes = meshes;
return model;
}
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