lights
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17f8d58a67
commit
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2
.gitignore
vendored
2
.gitignore
vendored
@ -1 +1,3 @@
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opengl-deferred
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assets/textures
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assets/geometries
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@ -5,7 +5,7 @@ layout (location = 1) in vec2 _tex;
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layout (location = 2) in vec3 _norm;
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uniform mat4 projection;
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uniform mat4 camera;
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uniform mat4 view;
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uniform mat4 model;
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out vec3 pos;
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@ -13,7 +13,7 @@ out vec3 norm;
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out vec2 tex;
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void main() {
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gl_Position = projection * camera * model * vec4(_pos, 1.0);
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gl_Position = projection * view * model * vec4(_pos, 1.0);
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pos = vec3(model * vec4(_pos, 1.0));
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norm = _norm;
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tex = _tex;
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@ -1,20 +1,65 @@
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#version 460 core
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uniform sampler2D albedo;
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uniform sampler2D depth;
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uniform sampler2D normal;
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uniform sampler2D material;
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uniform sampler2D position;
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// gbuffer textures
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uniform sampler2D s_albedo;
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uniform sampler2D s_depth;
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uniform sampler2D s_normal;
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uniform sampler2D s_material;
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uniform sampler2D s_position;
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// lights
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#define MAX_LIGHT_COUNT 100
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#define POINT 0
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#define SPOT 1
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#define DIRECTIONAL 2
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#define AMBIENT 3
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struct light_t {
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vec3 color;
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vec3 position;
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vec3 direction;
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float intensity;
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int type;
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};
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uniform light_t lights[MAX_LIGHT_COUNT];
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uniform int light_count;
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uniform vec3 view_pos;
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// from vertex shader
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in vec3 pos;
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in vec2 tex;
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out vec4 FragColor;
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float map(float value, float min1, float max1, float min2, float max2) {
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return min2 + (value - min1) * (max2 - min2) / (max1 - min1);
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vec3 albedo;
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float depth;
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vec3 normal;
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vec3 material; // specular, roughness, metalic
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vec3 position;
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vec3 calc_light(light_t light) {
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vec3 light_dir = normalize(light.position - position);
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vec3 view_dir = normalize(view_pos - position);
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vec3 reflect_dir = reflect(-light_dir, normal);
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float diffuse = max(dot(normal, light_dir), 0.0);
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float specular = pow(max(dot(view_dir, reflect_dir), 0.0), 1 - material.y) * material.x;
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return (diffuse + specular) * light.intensity * light.color / max(pow(length(light.position - position), 2), 1);
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}
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void main() {
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FragColor = texture(position, tex);
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albedo = texture(s_albedo, tex).rgb;
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depth = texture(s_depth, tex).x;
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normal = (texture(s_normal, tex).rgb * 2) - 1;
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material = texture(s_material, tex).xyz;
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position = texture(s_position, tex).xyz;
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vec3 light_result;
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for (int i = 0; i < light_count; i++) {
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light_result += calc_light(lights[i]);
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}
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FragColor = vec4(albedo * light_result, 1);
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}
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42
main.go
42
main.go
@ -7,6 +7,7 @@ import (
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"git.tek.govt.hu/dowerx/opengl-deferred/types/gbuffer"
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"git.tek.govt.hu/dowerx/opengl-deferred/types/geometry"
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"git.tek.govt.hu/dowerx/opengl-deferred/types/light"
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"git.tek.govt.hu/dowerx/opengl-deferred/types/shader"
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"git.tek.govt.hu/dowerx/opengl-deferred/types/texture"
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"github.com/go-gl/gl/v4.6-core/gl"
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@ -15,8 +16,8 @@ import (
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)
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const (
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WIDTH = 640
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HEIGHT = 480
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WIDTH = 800
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HEIGHT = 600
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TITLE = "opengl-deferred"
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FOV = 45.0
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)
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@ -48,7 +49,7 @@ func main() {
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}
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gl.Enable(gl.DEPTH_TEST)
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// gl.Enable(gl.CULL_FACE)
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gl.Enable(gl.CULL_FACE)
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gl.DepthFunc(gl.LESS)
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gl.ClearColor(0, 0, 0, 0)
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@ -87,7 +88,7 @@ func main() {
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defer screenShader.Delete()
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// geometry
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cube, err := geometry.LoadOBJ("assets/geometries/suzanne.obj")
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cube, err := geometry.LoadOBJ("assets/geometries/cube.obj")
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if err != nil {
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panic(err)
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}
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@ -130,6 +131,11 @@ func main() {
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}
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defer metalic.Delete()
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// lights
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lights := []light.Light{
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{Color: [3]float32{1, 1, 1}, Position: mgl32.Vec3{3, 3, 3}, Intensity: 10, Type: light.POINT},
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}
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// gbuffer
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gbuff, err := gbuffer.New(WIDTH, HEIGHT)
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if err != nil {
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@ -140,8 +146,8 @@ func main() {
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// transformations
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projection := mgl32.Perspective(mgl32.DegToRad(FOV), float32(WIDTH)/HEIGHT, 0.1, 10)
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camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
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model := mgl32.Ident4()
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viewPositon := mgl32.Vec3{3, 3, 3}
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view := mgl32.LookAtV(viewPositon, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
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angle := 0.0
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previousTime := glfw.GetTime()
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@ -152,10 +158,12 @@ func main() {
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previousTime = time
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angle += elapsed
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model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
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model := mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})
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// first pass
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// bind textures
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gl.Enable(gl.DEPTH_TEST)
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gbuff.Bind()
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gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
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@ -169,7 +177,7 @@ func main() {
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// transfer uniforms
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deferredShader.Use()
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deferredShader.Mat4("projection", projection)
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deferredShader.Mat4("camera", camera)
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deferredShader.Mat4("view", view)
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deferredShader.Mat4("model", model)
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deferredShader.Int("s_albedo", 0)
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@ -180,17 +188,23 @@ func main() {
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cube.Draw()
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// second pass
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gl.Disable(gl.DEPTH_TEST)
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gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
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gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
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gl.Clear(gl.COLOR_BUFFER_BIT)
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gbuff.BindTextures()
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screenShader.Use()
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screenShader.Int("albedo", 0)
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screenShader.Int("depth", 1)
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screenShader.Int("normal", 2)
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screenShader.Int("material", 3)
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screenShader.Int("position", 4)
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screenShader.Int("s_albedo", 0)
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screenShader.Int("s_depth", 1)
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screenShader.Int("s_normal", 2)
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screenShader.Int("s_material", 3)
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screenShader.Int("s_position", 4)
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screenShader.Vec3("view_pos", &viewPositon[0])
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for _, light := range lights {
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screenShader.Light(&light)
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}
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screen.Draw()
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20
types/light/light.go
Normal file
20
types/light/light.go
Normal file
@ -0,0 +1,20 @@
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package light
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import "github.com/go-gl/mathgl/mgl32"
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const MAX_LIGHT_COUNT = 100
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const (
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POINT int32 = iota
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SPOT int32 = iota
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DIRECTIONAL int32 = iota
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AMBIENT int32 = iota
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)
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type Light struct {
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Color mgl32.Vec3
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Position mgl32.Vec3
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Direction mgl32.Vec3
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Intensity float32
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Type int32
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}
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@ -2,19 +2,23 @@ package shader
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import (
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"errors"
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"fmt"
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"strings"
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"git.tek.govt.hu/dowerx/opengl-deferred/types/light"
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"github.com/go-gl/gl/v4.6-core/gl"
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"github.com/go-gl/mathgl/mgl32"
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)
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type Shader struct {
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program uint32
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uniforms map[string]int32
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program uint32
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uniforms map[string]int32
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lightCount int32
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}
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func (s *Shader) Use() {
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gl.UseProgram(s.program)
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s.lightCount = 0
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}
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func (s *Shader) Delete() {
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@ -40,6 +44,30 @@ func (s *Shader) Int(name string, val int32) {
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gl.Uniform1i(s.getUniformLocation(name), val)
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}
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func (s *Shader) Float(name string, val float32) {
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gl.Uniform1f(s.getUniformLocation(name), val)
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}
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func (s *Shader) Vec3(name string, val *float32) {
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gl.Uniform3fv(s.getUniformLocation(name), 1, val)
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}
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func (s *Shader) Light(l *light.Light) error {
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if s.lightCount >= light.MAX_LIGHT_COUNT {
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return errors.New("too many lights")
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}
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s.Vec3(fmt.Sprintf("lights[%d].color", s.lightCount), &l.Color[0])
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s.Vec3(fmt.Sprintf("lights[%d].position", s.lightCount), &l.Position[0])
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s.Vec3(fmt.Sprintf("lights[%d].direction", s.lightCount), &l.Direction[0])
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s.Float(fmt.Sprintf("lights[%d].intensity", s.lightCount), l.Intensity)
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s.Int(fmt.Sprintf("lights[%d].type", s.lightCount), l.Type)
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s.lightCount++
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s.Int("light_count", s.lightCount)
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return nil
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}
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func compileShader(source string, shaderType uint32) (uint32, error) {
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shader := gl.CreateShader(shaderType)
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