Implement Multi-Sample Anti Aliasing (MSAA)

.gitignore

@@ -1,3 +1,4 @@
 .cache
 compile_commands.json
 main
+*.py

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/assimp"]
+	path = src/assimp
+	url = git@github.com:assimp/assimp

compile

@@ -3,15 +3,15 @@
 CC=clang
 CFLAGS="-g -c -Wall -Isrc/glad/include"
 CXX=clang++
-CXXFLAGS="-g -Wall -std=c++20 $(pkg-config --cflags sdl2) -Isrc/glad/include -Isrc/glm"
-LIBS="$(pkg-config --libs sdl2) -ldl"
+CXXFLAGS="-g -Wall -std=c++20 $(pkg-config --cflags sdl2) -Isrc/glad/include -Isrc/glm -Isrc/assimp/include -Isrc/assimp/build/include"
+LIBS="$(pkg-config --libs sdl2) -ldl -lz -lminizip -Lsrc/assimp/build/lib/ -lassimp"
 GLAD_SRC="src/glad/src/glad.c"
 GLAD_OBJ="glad.o"
 SRC="src/*.cc $GLAD_OBJ src/glm/glm/glm.cppm"
 OUT=main
 
 (set -x ; $CC $CFLAGS $GLAD_SRC -o $GLAD_OBJ)
-(set -x ; $CXX $CXXFLAGS $LIBS $SRC -o $OUT)
+(set -x ; $CXX $CXXFLAGS $SRC $LIBS -o $OUT)
 
 if [[ -f $GLAD_OBJ ]]; then
   rm $GLAD_OBJ

models/suzanne/suzanne.mtl

@@ -0,0 +1,12 @@
+# Blender 4.3.2 MTL File: 'None'
+# www.blender.org
+
+newmtl Material
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd diffuse.png
+map_Ks specular.png

shaders/frag.glsl

@@ -1,13 +1,118 @@
 #version 330 core
 
-in vec2 tex_coords;
+#define POINT_LIGHT_COUNT 4
+
+struct Material {
+  sampler2D diffuse1;
+  sampler2D specular1;
+  float shininess;
+};
+
+struct DirLight {
+  vec3 direction;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+struct PointLight {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float constant;
+  float linear;
+  float quadratic;
+};
+
+struct SpotLight {
+  vec3 position;
+  vec3 direction;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float cutoff;
+  float outer_cutoff;
+};
+
+in VS_OUT {
+  vec3 vert_normal;
+  vec3 frag_position;
+  vec2 uv_coords;
+} fs_in;
+
+uniform Material material;
+uniform DirLight directional_light;
+uniform PointLight point_lights[POINT_LIGHT_COUNT];
+uniform SpotLight spot_light;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+vec3 calc_dir_light(DirLight light, vec3 normal, vec3 view_direction);
+vec3 calc_point_light(PointLight light, vec3 normal, vec3 frag_position, vec3 view_direction);
+vec3 calc_spot_light(SpotLight light, vec3 normal, vec3 frag_position, vec3 view_direction);
 
 out vec4 color;
 
-uniform float     mix_factor;
-uniform sampler2D texture0;
-uniform sampler2D texture1;
-
 void main() {
-  color = mix(texture(texture0, tex_coords), texture(texture1, tex_coords), mix_factor);
+  vec3  normal         = normalize(fs_in.vert_normal);
+  vec3  view_direction = normalize(fs_in.frag_position - camera_position);
+
+  vec3 result = calc_dir_light(directional_light, normal, view_direction);
+
+  for (int i = 0; i < POINT_LIGHT_COUNT; ++i) {
+    result += calc_point_light(point_lights[i], normal, fs_in.frag_position, view_direction);
+  }
+
+  result += calc_spot_light(spot_light, normal, fs_in.frag_position, view_direction);
+
+  color = vec4(result, 1.0);
 };
+
+vec3 calc_dir_light(DirLight light, vec3 normal, vec3 view_direction) {
+  vec3 light_direction     = normalize(-light.direction);
+  vec3  reflect_direction  = reflect(-light_direction, normal);
+  float diff               = max(dot(normal, light_direction), 0.0);
+  vec3  diff_tex           = vec3(texture(material.diffuse1, fs_in.uv_coords));
+  float spec               = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
+  vec3  ambient            = light.ambient * diff_tex;
+  vec3  diffuse            = light.diffuse * (diff * diff_tex);
+  vec3  specular           = light.specular * (spec * vec3(texture(material.specular1, fs_in.uv_coords)));
+
+  return ambient + diffuse + specular;
+}
+
+vec3 calc_point_light(PointLight light, vec3 normal, vec3 frag_position, vec3 view_direction) {
+  vec3 light_direction     = normalize(light.position - frag_position);
+  vec3  reflect_direction  = reflect(-light_direction, normal);
+  float distance           = length(light.position - frag_position);
+  float attenuation        = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+  float diff               = max(dot(normal, light_direction), 0.0);
+  vec3  diff_tex           = vec3(texture(material.diffuse1, fs_in.uv_coords));
+  float spec               = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
+  vec3  ambient            = light.ambient * diff_tex * attenuation;
+  vec3  diffuse            = light.diffuse * (diff * diff_tex) * attenuation;
+  vec3  specular           = light.specular * (spec * vec3(texture(material.specular1, fs_in.uv_coords))) * attenuation;
+
+  return ambient + diffuse + specular;
+}
+
+vec3 calc_spot_light(SpotLight light, vec3 normal, vec3 frag_position, vec3 view_direction) {
+  vec3 light_direction     = normalize(light.position - frag_position);
+  vec3  reflect_direction  = reflect(-light_direction, normal);
+  float theta              = dot(light_direction, normalize(-light.direction));
+  float epsilon            = light.cutoff - light.outer_cutoff;
+  float intensity          = clamp((theta - light.outer_cutoff) / epsilon, 0.0, 1.0);
+  float diff               = max(dot(normal, light_direction), 0.0);
+  float spec               = pow(max(dot(reflect_direction, view_direction), 0.0), material.shininess);
+  vec3  diff_tex           = vec3(texture(material.diffuse1, fs_in.uv_coords));
+  vec3  ambient            = light.ambient * diff_tex;
+  vec3  diffuse            = light.diffuse * (diff * diff_tex) * intensity;
+  vec3  specular           = light.specular * (spec * vec3(texture(material.specular1, fs_in.uv_coords))) * intensity;
+
+  return ambient + diffuse + specular;
+}

shaders/light_frag.glsl

@@ -0,0 +1,9 @@
+#version 330 core
+
+out vec4 color;
+
+uniform vec3 light_diffuse;
+
+void main() {
+  color = vec4(light_diffuse, 1.0);
+}

shaders/light_vert.glsl

@@ -0,0 +1,18 @@
+#version 330 core
+
+#define POINT_LIGHT_COUNT 4
+
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
+layout(location=3) in mat4 model;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+void main() {
+  gl_Position = projection * view * model * vec4(position, 1.0);
+};

shaders/normal_frag.glsl

@@ -0,0 +1,7 @@
+#version 330 core
+
+out vec4 color;
+
+void main() {
+  color = vec4(1.0, 1.0, 0.0, 1.0);
+}

shaders/normal_geo.glsl

@@ -0,0 +1,34 @@
+#version 330 core
+
+#define MAGNITUDE 0.1
+
+layout (triangles) in;
+layout (line_strip, max_vertices = 6) out;
+
+uniform float time;
+
+in VS_OUT {
+  vec3 vert_normal;
+} gs_in[];
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+void generate_line(int index) {
+  gl_Position = projection * gl_in[index].gl_Position;
+  EmitVertex();
+
+  gl_Position = projection * (gl_in[index].gl_Position + vec4(gs_in[index].vert_normal, 1.0) * MAGNITUDE);
+  EmitVertex();
+
+  EndPrimitive();
+}
+
+void main() {
+  for (int i = 0; i < 3; ++i) {
+    generate_line(i);
+  }
+}

shaders/normal_vert.glsl

@@ -0,0 +1,25 @@
+#version 330 core
+
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
+
+uniform mat3 normal_mat;
+uniform mat4 model;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+// interface block
+out VS_OUT {
+  vec3 vert_normal;
+} vs_out;
+
+void main() {
+  vs_out.vert_normal = normal_mat * normal;
+
+  gl_Position = view * model * vec4(position, 1.0);
+};

shaders/pp_frag.glsl

@@ -0,0 +1,17 @@
+#version 330 core
+
+struct Material {
+  sampler2D diffuse1;
+  sampler2D specular1;
+  float shininess;
+};
+
+in vec2 uv_coords;
+
+uniform Material material;
+
+out vec4 color;
+
+void main() {
+  color = vec4(vec3(texture(material.diffuse1, uv_coords)), 1.0);
+}

shaders/pp_vert.glsl

@@ -0,0 +1,12 @@
+#version 330 core
+
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
+
+out vec2 uv_coords;
+
+void main() {
+  gl_Position = vec4(position.x, position.y, 0.0, 1.0);
+  uv_coords   = uv;
+}

shaders/reflective_frag.glsl

@@ -0,0 +1,24 @@
+#version 330 core
+
+in VS_OUT {
+  vec3 vert_normal;
+  vec3 frag_position;
+  vec2 uv_coords;
+} fs_in;
+
+uniform samplerCube cubemap;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+out vec4 color;
+
+void main() {
+  vec3 view_direction    = normalize(fs_in.frag_position - camera_position);
+  vec3 reflect_direction = reflect(view_direction, normalize(fs_in.vert_normal));
+
+  color = vec4(texture(cubemap, reflect_direction).rgb, 1.0);
+}

shaders/refractive_frag.glsl

@@ -0,0 +1,27 @@
+#version 330 core
+
+#define AIR_IOR 1.0
+#define GLASS_IOR 1.52
+
+in VS_OUT {
+  vec3 vert_normal;
+  vec3 frag_position;
+  vec2 uv_coords;
+} fs_in;
+
+uniform samplerCube cubemap;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+out vec4 color;
+
+void main() {
+  vec3 view_direction    = normalize(fs_in.frag_position - camera_position);
+  vec3 refract_direction = refract(view_direction, normalize(fs_in.vert_normal), AIR_IOR / GLASS_IOR);
+
+  color = vec4(texture(cubemap, refract_direction).rgb, 1.0);
+}

shaders/sb_frag.glsl

@@ -0,0 +1,11 @@
+#version 330 core
+
+in vec3 uv_coords;
+
+uniform samplerCube cubemap;
+
+out vec4 color;
+
+void main() {
+  color = texture(cubemap, uv_coords);
+}

shaders/sb_vert.glsl

@@ -0,0 +1,21 @@
+#version 330 core
+
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
+
+uniform mat4 sb_view;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+out vec3 uv_coords;
+
+void main() {
+  vec4 pos    = projection * sb_view * vec4(position, 1.0);
+  gl_Position = pos.xyww;
+  uv_coords   = position;
+}

shaders/vert.glsl

@@ -1,15 +1,29 @@
 #version 330 core
 
 layout(location=0) in vec3 position;
-layout(location=1) in vec2 uv;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
 
+uniform mat3 normal_mat;
 uniform mat4 model;
-uniform mat4 view;
-uniform mat4 projection;
 
-out vec2 tex_coords;
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+// interface block
+out VS_OUT {
+  vec3 vert_normal;
+  vec3 frag_position;
+  vec2 uv_coords;
+} vs_out;
 
 void main() {
-  tex_coords  = uv;
+  vs_out.frag_position = vec3(model * vec4(position, 1.0));
+  vs_out.vert_normal   = normal_mat * normal;
+  vs_out.uv_coords     = uv;
+
   gl_Position = projection * view * model * vec4(position, 1.0);
 };

src/assimp

@@ -0,0 +1 @@
+Subproject commit 258cdfd2bc29a920bbe749962abbcd58caa76422