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Flip the Y texture coordinate when loading the OBJ model

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Abdelrahman Said 2024-08-25 01:32:54 +01:00
parent cee57282cb
commit 185f44252f
2 changed files with 3 additions and 3 deletions
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2
src/model/obj.c
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@ -56,7 +56,7 @@ Model load_obj_file(Arena *arena, const char *filename, const char *texture,
} else if (strncmp(identifier, "vt", 8) == 0) { } else if (strncmp(identifier, "vt", 8) == 0) {
sscanf(line + 2, "%f %f", &u, &v); sscanf(line + 2, "%f %f", &u, &v);
coord.u = u; coord.u = u;
coord.v = v; coord.v = 1.0f - v;
list_append(V2f, arena, model.texture_coordinates, coord); list_append(V2f, arena, model.texture_coordinates, coord);
} else if (strncmp(identifier, "f", 8) == 0) { } else if (strncmp(identifier, "f", 8) == 0) {
sscanf(line + 2, "%lu/%lu/%lu %lu/%lu/%lu %lu/%lu/%lu", &fp0, &tx0, &vn0, sscanf(line + 2, "%lu/%lu/%lu %lu/%lu/%lu %lu/%lu/%lu", &fp0, &tx0, &vn0,

4
src/shader/shaders.c
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@ -94,7 +94,7 @@ internal FragmentResult phong_shader_fragment(void *shader,
V3f norm; V3f norm;
if (model->normal) { if (model->normal) {
u64 nm_x = data->tex_coords.u * model->normal->width; u64 nm_x = data->tex_coords.u * model->normal->width;
u64 nm_y = (1.0f - data->tex_coords.v) * model->normal->height; u64 nm_y = data->tex_coords.v * model->normal->height;
Colour pixel = get_pixel(Colour, model->normal, nm_x, nm_y); Colour pixel = get_pixel(Colour, model->normal, nm_x, nm_y);
hnorm = (V4f){ hnorm = (V4f){
@ -118,7 +118,7 @@ internal FragmentResult phong_shader_fragment(void *shader,
Colour output; Colour output;
if (model->texture) { if (model->texture) {
u64 tx_x = data->tex_coords.u * model->texture->width; u64 tx_x = data->tex_coords.u * model->texture->width;
u64 tx_y = (1.0f - data->tex_coords.v) * model->texture->height; u64 tx_y = data->tex_coords.v * model->texture->height;
output = get_pixel(Colour, model->texture, tx_x, tx_y); output = get_pixel(Colour, model->texture, tx_x, tx_y);
} else { } else {
output = *colour; output = *colour;