something

8 files changed, 160 insertions, 0 deletions

diff --git a/advanced_lighting/8.deferred_shading/shaders/deferred.frag b/advanced_lighting/8.deferred_shading/shaders/deferred.frag
new file mode 100644
index 0000000..56e5f58
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/deferred.frag
@@ -0,0 +1,46 @@
+#version 330 core
+
+in vert_t {
+    vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D positions;
+uniform sampler2D normals;
+uniform sampler2D color_specular;
+
+uniform vec3 view_position;
+
+struct light_t {
+    vec3 position;
+    vec3 color;
+};
+
+const int light_count = 200;
+uniform light_t lights[light_count];
+
+const float linear = 0.7f;
+const float quadratic = 1.8f;
+
+void main()
+{
+    vec3 position = texture(positions, vert.tex_coords).rgb;
+    vec3 normal = texture(normals, vert.tex_coords).rgb;
+    vec3 color = texture(color_specular, vert.tex_coords).rgb;
+    float specular = texture(color_specular, vert.tex_coords).a;
+
+    vec3 ambient = 0.1 * color;
+    vec3 view_dir = normalize(view_position - position);
+    vec3 result = ambient;
+    for (int i = 0; i < light_count; i++) {
+        vec3 light_dir = normalize(lights[i].position - position);
+        vec3 diffuse = max(dot(normal, light_dir), 0.0) * color * lights[i].color;
+        float distance = length(lights[i].position - position);
+        float attenuation = 1.0 / (1.0 + linear * distance + quadratic * distance * distance);
+        vec3 halfway_dir = normalize(view_dir + light_dir);
+        vec3 specular = pow(max(dot(halfway_dir, normal), 0.0), 32.0) * vec3(0.5);
+        result += (diffuse + specular) * attenuation;
+    }
+    frag_color = vec4(result, 1.0);
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/gbuffer.frag b/advanced_lighting/8.deferred_shading/shaders/gbuffer.frag
new file mode 100644
index 0000000..5f82c0b
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/gbuffer.frag
@@ -0,0 +1,23 @@
+#version 330 core
+
+in vert_t {
+    vec3 position;
+    vec3 normal;
+    vec2 tex_coords;
+} vert;
+
+layout (location = 0) out vec3 position;
+layout (location = 1) out vec3 normal;
+layout (location = 2) out vec4 color_specular;
+
+uniform sampler2D texture_diffuse;
+
+void main()
+{
+    position = vert.position;
+    normal = vert.normal;
+    color_specular.rgb = texture(texture_diffuse, vert.tex_coords).rgb;
+    // TODO(pryazha): add specular texture
+    // color_specular.a = texture(texture_specular, vert.tex_coords).r;
+    color_specular.a = 1;
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/gbuffer.vert b/advanced_lighting/8.deferred_shading/shaders/gbuffer.vert
new file mode 100644
index 0000000..1e825c8
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/gbuffer.vert
@@ -0,0 +1,24 @@
+#version 330 core
+
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+layout (location = 2) in vec2 tex_coords;
+
+out vert_t {
+    vec3 position;
+    vec3 normal;
+    vec2 tex_coords;
+} vert;
+
+uniform mat4 projection;
+uniform mat4 view;
+uniform mat4 model;
+
+void main()
+{
+    vert.position = vec3(model * vec4(position, 1.0));
+    mat3 matrix_normal = transpose(inverse(mat3(model)));
+    vert.normal = matrix_normal * normal;
+    vert.tex_coords = tex_coords;
+    gl_Position = projection * view * model * vec4(position, 1.0);
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/light.frag b/advanced_lighting/8.deferred_shading/shaders/light.frag
new file mode 100644
index 0000000..e654b0e
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/light.frag
@@ -0,0 +1,11 @@
+#version 330 core
+
+out vec4 frag_color;
+
+uniform vec3 light_color;
+
+void main()
+{
+	frag_color = vec4(light_color, 1.0);
+}
+
diff --git a/advanced_lighting/8.deferred_shading/shaders/light.vert b/advanced_lighting/8.deferred_shading/shaders/light.vert
new file mode 100644
index 0000000..03ac7e2
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/light.vert
@@ -0,0 +1,12 @@
+#version 330 core
+
+layout(location = 0) in vec3 position;
+
+uniform mat4 projection;
+uniform mat4 view;
+uniform mat4 model;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0);
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/screen.frag b/advanced_lighting/8.deferred_shading/shaders/screen.frag
new file mode 100644
index 0000000..3ae592d
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/screen.frag
@@ -0,0 +1,14 @@
+#version 330 core
+
+in vert_t {
+    vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D colorbuffer;
+
+void main()
+{
+    frag_color = vec4(texture(colorbuffer, vert.tex_coords).rgb, 1.0);
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/screen.vert b/advanced_lighting/8.deferred_shading/shaders/screen.vert
new file mode 100644
index 0000000..335635b
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/screen.vert
@@ -0,0 +1,16 @@
+#version 330 core
+
+layout (location = 0) in vec3 position;
+layout (location = 2) in vec2 tex_coords;
+
+out vert_t {
+    vec2 tex_coords;
+} vert;
+
+uniform mat4 model;
+
+void main()
+{
+    vert.tex_coords = tex_coords;
+    gl_Position = model * vec4(position, 1.0);
+}
diff --git a/advanced_lighting/8.deferred_shading/shaders/specular.frag b/advanced_lighting/8.deferred_shading/shaders/specular.frag
new file mode 100644
index 0000000..e6ea10e
--- /dev/null
+++ b/advanced_lighting/8.deferred_shading/shaders/specular.frag
@@ -0,0 +1,14 @@
+#version 330 core
+
+in vert_t {
+    vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D colorbuffer;
+
+void main()
+{
+    frag_color = vec4(vec3(texture(colorbuffer, vert.tex_coords).a), 1.0);
+}