Sprite3D normal maps + billboard
This shader is people who want to use normal maps for an hd-2d type game. How it works is with a quad mesh size set to 2 for both values and the shader using this shader
Shader code
shader_type spatial;
uniform sampler2D diffuse: source_color, filter_nearest;
uniform sampler2D normal_map: source_color, hint_normal;
uniform uint frame = 0;
uniform uint h_frames = 1;
uniform uint v_frames = 1;
uniform bool enable_Ybillboard = false;
uniform bool enable_billboard = false;
void vertex() {
vec2 uv_mod = 1.0 / vec2(float(h_frames), float(v_frames));
float uv_off_x = uv_mod.x * float(frame % h_frames);
float uv_off_y = uv_mod.y * float(frame / h_frames);
UV = UV * uv_mod + vec2(uv_off_x, uv_off_y);
//y-billboard code
if (enable_Ybillboard && !enable_billboard) {
MODELVIEW_MATRIX = VIEW_MATRIX * mat4(
vec4(normalize(cross(vec3(0.0, 1.0, 0.0), MAIN_CAM_INV_VIEW_MATRIX[2].xyz)), 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(normalize(cross(MAIN_CAM_INV_VIEW_MATRIX[0].xyz, vec3(0.0, 1.0, 0.0))), 0.0),
MODEL_MATRIX[3]);
MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);
}
//billboard code
else if (enable_billboard && !enable_Ybillboard) {
MODELVIEW_MATRIX = VIEW_MATRIX * mat4(
MAIN_CAM_INV_VIEW_MATRIX[0],
MAIN_CAM_INV_VIEW_MATRIX[1],
MAIN_CAM_INV_VIEW_MATRIX[2],
MODEL_MATRIX[3]);
MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);
}
}
void fragment() {
vec4 color = texture(diffuse, UV);
if (color.a <= 0.0f) { // alpha scissor
discard;
}
ALBEDO = color.rgb;
ALPHA = color.a; // regular alpha
NORMAL = texture(normal_map, UV).rbg;
}