97 lines
3.3 KiB
GLSL
97 lines
3.3 KiB
GLSL
#version 430 core
|
|
|
|
out vec4 FragColor;
|
|
|
|
in VS_OUT {
|
|
vec3 FragPos;
|
|
vec2 TexCoords;
|
|
vec3 TangentLightPos;
|
|
vec3 TangentViewPos;
|
|
vec3 TangentFragPos;
|
|
} fs_in;
|
|
|
|
layout (binding = 0) uniform sampler2D albedoMap;
|
|
layout (binding = 1) uniform sampler2D normalMap;
|
|
layout (binding = 2) uniform sampler2D depthMap;
|
|
|
|
uniform float bump_depth;
|
|
uniform float number_of_steps;
|
|
uniform float number_of_refinement_steps;
|
|
|
|
vec2 get_parallax_offset_uv(vec2 uv, vec3 view_direction) {
|
|
float layer_depth = 1.0 / number_of_steps;
|
|
float refinement_layer_depth = layer_depth / number_of_refinement_steps;
|
|
|
|
float current_layer_depth = 0.0;
|
|
|
|
// the amount to shift the texture coordinates per layer (from vector total_uv_shift)
|
|
vec2 total_uv_shift = view_direction.xy / view_direction.z * bump_depth;
|
|
vec2 uv_shift_per_layer = total_uv_shift / number_of_steps;
|
|
vec2 uv_refine_shift_per_layer = total_uv_shift / (number_of_steps * number_of_refinement_steps);
|
|
|
|
// Initial values
|
|
vec2 current_uv = uv;
|
|
float current_bump_value = 1.0 - texture(depthMap, current_uv).r;
|
|
|
|
// Loop until our depth is greater than the value in the bump map, meaning our ray collided
|
|
while(current_layer_depth < current_bump_value) {
|
|
current_uv -= uv_shift_per_layer;
|
|
current_bump_value = 1.0 - texture(depthMap, current_uv).r;
|
|
current_layer_depth += layer_depth;
|
|
}
|
|
|
|
// Reverse the last operations so we're at the point before the collision
|
|
current_uv += uv_shift_per_layer;
|
|
current_bump_value = 1.0 - texture(depthMap, current_uv).r;
|
|
|
|
// Loop again for the refinement steps
|
|
while(current_layer_depth < current_bump_value) {
|
|
current_uv -= uv_refine_shift_per_layer;
|
|
current_bump_value = 1.0 - texture(depthMap, current_uv).r;
|
|
current_layer_depth += refinement_layer_depth;
|
|
}
|
|
|
|
// Referse the UV operation again and return the result
|
|
current_uv += uv_refine_shift_per_layer;
|
|
|
|
return current_uv;
|
|
}
|
|
|
|
void main() {
|
|
// Offset texture coordinates with Parallax Mapping
|
|
vec3 view_direction = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
|
|
vec2 uv = fs_in.TexCoords;
|
|
|
|
uv = get_parallax_offset_uv(uv, view_direction);
|
|
|
|
// Discard if the parallax offset moved us outside of the texture
|
|
// TODO: Do this only if the mode is not REPEAT
|
|
//if (uv.x > 1.0 || uv.y > 1.0 || uv.x < 0.0 || uv.y < 0.0)
|
|
// discard;
|
|
|
|
// Get normal from normal map and scale it to -1..1
|
|
vec3 normal = texture(normalMap, uv).rgb;
|
|
normal = normalize(normal * 2.0 - 1.0);
|
|
|
|
// Get albedo color
|
|
vec3 color = texture(albedoMap, uv).rgb;
|
|
|
|
// Ambient lighting
|
|
vec3 ambient = 0.1 * color;
|
|
|
|
// Apply albedo with intensity based on the dot product between the light direction and the normal here
|
|
vec3 light_direction = normalize(fs_in.TangentLightPos - fs_in.TangentFragPos);
|
|
float light_normal_dot = max(dot(light_direction, normal), 0.0);
|
|
vec3 albedo = light_normal_dot * color;
|
|
|
|
// Specular lighting
|
|
vec3 halfway_reflected_light_direction = normalize(light_direction + view_direction);
|
|
float spec = pow(max(dot(normal, halfway_reflected_light_direction), 0.0), 32.0);
|
|
|
|
vec3 specular = vec3(0.2) * spec;
|
|
|
|
// Apply
|
|
FragColor = vec4(ambient + albedo + specular, 1.0);
|
|
}
|
|
|