more lighting

.gitignore

@@ -1 +1,2 @@
 builddir/
+.cache/

shaders/lighting_fragment.glsl

@@ -31,11 +31,27 @@ struct DirectionalLight {
     vec3 specular;
 };
 
+struct SpotLight {
+    vec3 position;  
+    vec3 direction;
+    float cutOff;
+    float outerCutOff;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+
+    float constant;
+    float linear;
+    float quadratic;
+};
+
 #define POINT_LIGHTS_COUNT 4
 
 uniform Material material;
 uniform vec3 viewPos;
 
+uniform SpotLight spotLight;
 uniform DirectionalLight directionalLight;
 uniform PointLight pointLights[POINT_LIGHTS_COUNT];
 
@@ -55,12 +71,12 @@ vec3 ComputeDirectionalLight(DirectionalLight light, vec3 norm, vec3 viewDir)
     return (ambient + diffuse + specular);
 }
 
-vec3 ComputePointLight(PointLight light, vec3 norm, vec3 viewDir)
+vec3 ComputePointLight(PointLight light, vec3 norm, vec3 viewDir, vec3 fragPos)
 {
-    float distance = length(light.position - FragPos);
+    float distance = length(light.position - fragPos);
     float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
 
-    vec3 lightDir = normalize(light.position - FragPos);
+    vec3 lightDir = normalize(light.position - fragPos);
     vec3 reflectDir = reflect(-lightDir, norm);
 
     float diff = max(dot(norm, lightDir), 0.0);
@@ -73,16 +89,40 @@ vec3 ComputePointLight(PointLight light, vec3 norm, vec3 viewDir)
     return (ambient * attenuation + diffuse * attenuation + specular * attenuation);
 }
 
+vec3 ComputeSpotLight(SpotLight light, vec3 norm, vec3 viewDir, vec3 fragPos) {
+    vec3 lightDir = normalize(light.position - fragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);
+
+    float theta = dot(lightDir, normalize(-light.direction));
+    float epsilon = light.cutOff - light.outerCutOff;
+    float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
+
+    float distance = length(light.position - fragPos);
+    float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+    float diff = max(dot(norm, lightDir), 0.0);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+    vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
+    vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));
+    vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));
+
+    // we leave ambient alone so there's always a little light
+    return ((ambient * attenuation) + (diffuse * intensity * attenuation) + (specular * intensity * attenuation));
+}
+
 void main()
 {
     vec3 norm = normalize(Normal);
     vec3 viewDir = normalize(viewPos - FragPos);
 
     vec3 result = vec3(0.0);
+    
     result += ComputeDirectionalLight(directionalLight, norm, viewDir);
     for (int i = 0; i < POINT_LIGHTS_COUNT; i++) {
-        result += ComputePointLight(pointLights[i], norm, viewDir);
+        result += ComputePointLight(pointLights[i], norm, viewDir, FragPos);
     }
+    result += ComputeSpotLight(spotLight, norm, viewDir, FragPos);
 
     FragColor = vec4(result, 1.0);
 }

src/main.cpp

@@ -24,10 +24,10 @@ std::function<void(double x, double y)> cursor_position_callback = nullptr;
 int main()
 {
     qoi_desc fish_desc;
-    void *fish_rgba = qoi_read("assets/fish.qoi", &fish_desc, 4);
+    void *fish_rgba = qoi_read("assets/container2.qoi", &fish_desc, 4);
 
     qoi_desc fish_map_desc;
-    void *fish_map_rgba = qoi_read("assets/fish-map.qoi", &fish_map_desc, 4);
+    void *fish_map_rgba = qoi_read("assets/container2_specular.qoi", &fish_map_desc, 4);
 
 
     if (!glfwInit()) {
@@ -107,6 +107,27 @@ int main()
         -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f, 1.0f
     };
 
+    // positions all containers
+    glm::vec3 cube_positions[] = {
+        glm::vec3( 0.0f,  0.0f,  0.0f),
+        glm::vec3( 2.0f,  5.0f, -15.0f),
+        glm::vec3(-1.5f, -2.2f, -2.5f),
+        glm::vec3(-3.8f, -2.0f, -12.3f),
+        glm::vec3( 2.4f, -0.4f, -3.5f),
+        glm::vec3(-1.7f,  3.0f, -7.5f),
+        glm::vec3( 1.3f, -2.0f, -2.5f),
+        glm::vec3( 1.5f,  2.0f, -2.5f),
+        glm::vec3( 1.5f,  0.2f, -1.5f),
+        glm::vec3(-1.3f,  1.0f, -1.5f)
+    };
+    // positions of the point lights
+    glm::vec3 point_light_positions[] = {
+        glm::vec3( 0.7f,  0.2f,  2.0f),
+        glm::vec3( 2.3f, -3.3f, -4.0f),
+        glm::vec3(-4.0f,  2.0f, -12.0f),
+        glm::vec3( 0.0f,  0.0f, -3.0f)
+    };
+
     unsigned int fish_texture;
     glGenTextures(1, &fish_texture);
     glBindTexture(GL_TEXTURE_2D, fish_texture);
@@ -131,6 +152,8 @@ int main()
     glGenVertexArrays(1, &object_vao);
     glBindVertexArray(object_vao);
 
+    glBindBuffer(GL_ARRAY_BUFFER, cube_buffer);
+
     // position
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
     glEnableVertexAttribArray(0);
@@ -145,6 +168,8 @@ int main()
     glGenVertexArrays(1, &light_source_vao);
     glBindVertexArray(light_source_vao);
 
+    glBindBuffer(GL_ARRAY_BUFFER, cube_buffer);
+
     // position
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
     glEnableVertexAttribArray(0);
@@ -165,8 +190,6 @@ int main()
     float delta_time = 0.0f;
     float last_frame_time = 0.0f;
 
-    glm::vec3 light_position(1.2f, 1.0f, 2.0f);
-
     while (!glfwWindowShouldClose(window)) {
         float current_frame_time = glfwGetTime();
         delta_time = current_frame_time - last_frame_time;
@@ -195,7 +218,7 @@ int main()
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
         {
-            /* lit object */
+            /* lit objects */
             {
                 glActiveTexture(GL_TEXTURE0);
                 glBindTexture(GL_TEXTURE_2D, fish_texture);
@@ -203,33 +226,81 @@ int main()
                 glBindTexture(GL_TEXTURE_2D, fish_map_texture);
 
                 glUseProgram(lighting_program);
-
                 glBindVertexArray(object_vao);
-                glUniformMatrix4fv(glGetUniformLocation(lighting_program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
-                glUniformMatrix4fv(glGetUniformLocation(lighting_program, "view"), 1, GL_FALSE, glm::value_ptr(camera.view));
-                glUniformMatrix4fv(glGetUniformLocation(lighting_program, "model"), 1, GL_FALSE, glm::value_ptr(glm::mat4(1.0f)));
-                glUniform3fv(glGetUniformLocation(lighting_program, "viewPos"), 1, glm::value_ptr(camera.position));
 
-                glUniform1i(glGetUniformLocation(lighting_program, "material.diffuse"), 0);
-                glUniform1i(glGetUniformLocation(lighting_program, "material.specular"), 1);
-                glUniform1f(glGetUniformLocation(lighting_program, "material.shininess"), 32.0f);
+                program_set(lighting_program, "projection", projection);
+                program_set(lighting_program, "view", camera.view);
+                program_set(lighting_program, "viewPos", camera.position);
 
-                glUniform3fv(glGetUniformLocation(lighting_program, "light.position"), 1, glm::value_ptr(light_position));
-                glUniform3f(glGetUniformLocation(lighting_program, "light.ambient"), 0.2f, 0.2f, 0.2f);
-                glUniform3f(glGetUniformLocation(lighting_program, "light.diffuse"), 0.5f, 0.5f, 0.5f);
-                glUniform3f(glGetUniformLocation(lighting_program, "light.specular"), 1.0f, 1.0f, 1.0f);
-                glDrawArrays(GL_TRIANGLES, 0, 36);
+                program_set(lighting_program, "material.shininess", 32.0f);
+
+                program_set(lighting_program, "directionalLight.direction", -0.2f, -1.0f, -0.3f);
+                program_set(lighting_program, "directionalLight.ambient", 0.05f, 0.05f, 0.05f);
+                program_set(lighting_program, "directionalLight.diffuse", 0.4f, 0.4f, 0.4f);
+                program_set(lighting_program, "directionalLight.specular", 0.5f, 0.5f, 0.5f);
+                // point light 1
+                program_set(lighting_program, "pointLights[0].position", point_light_positions[0]);
+                program_set(lighting_program, "pointLights[0].ambient", 0.05f, 0.05f, 0.05f);
+                program_set(lighting_program, "pointLights[0].diffuse", 0.8f, 0.8f, 0.8f);
+                program_set(lighting_program, "pointLights[0].specular", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "pointLights[0].constant", 1.0f);
+                program_set(lighting_program, "pointLights[0].linear", 0.09f);
+                program_set(lighting_program, "pointLights[0].quadratic", 0.032f);
+                // point light 2
+                program_set(lighting_program, "pointLights[1].position", point_light_positions[1]);
+                program_set(lighting_program, "pointLights[1].ambient", 0.05f, 0.05f, 0.05f);
+                program_set(lighting_program, "pointLights[1].diffuse", 0.8f, 0.8f, 0.8f);
+                program_set(lighting_program, "pointLights[1].specular", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "pointLights[1].constant", 1.0f);
+                program_set(lighting_program, "pointLights[1].linear", 0.09f);
+                program_set(lighting_program, "pointLights[1].quadratic", 0.032f);
+                // point light 3
+                program_set(lighting_program, "pointLights[2].position", point_light_positions[2]);
+                program_set(lighting_program, "pointLights[2].ambient", 0.05f, 0.05f, 0.05f);
+                program_set(lighting_program, "pointLights[2].diffuse", 0.8f, 0.8f, 0.8f);
+                program_set(lighting_program, "pointLights[2].specular", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "pointLights[2].constant", 1.0f);
+                program_set(lighting_program, "pointLights[2].linear", 0.09f);
+                program_set(lighting_program, "pointLights[2].quadratic", 0.032f);
+                // point light 4
+                program_set(lighting_program, "pointLights[3].position", point_light_positions[3]);
+                program_set(lighting_program, "pointLights[3].ambient", 0.05f, 0.05f, 0.05f);
+                program_set(lighting_program, "pointLights[3].diffuse", 0.8f, 0.8f, 0.8f);
+                program_set(lighting_program, "pointLights[3].specular", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "pointLights[3].constant", 1.0f);
+                program_set(lighting_program, "pointLights[3].linear", 0.09f);
+                program_set(lighting_program, "pointLights[3].quadratic", 0.032f);
+                // spot light
+                program_set(lighting_program, "spotLight.position", camera.position);
+                program_set(lighting_program, "spotLight.direction", camera.front);
+                program_set(lighting_program, "spotLight.ambient", 0.0f, 0.0f, 0.0f);
+                program_set(lighting_program, "spotLight.diffuse", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "spotLight.specular", 1.0f, 1.0f, 1.0f);
+                program_set(lighting_program, "spotLight.constant", 1.0f);
+                program_set(lighting_program, "spotLight.linear", 0.09f);
+                program_set(lighting_program, "spotLight.quadratic", 0.032f);
+                program_set(lighting_program, "spotLight.cutOff", glm::cos(glm::radians(12.5f)));
+                program_set(lighting_program, "spotLight.outerCutOff", glm::cos(glm::radians(15.0f)));
+
+
+                for (int i = 0; i < 10; i++) {
+                    program_set(lighting_program, "model", glm::rotate(glm::translate(glm::mat4(1.0f), cube_positions[i]), glm::radians(20.0f * i), glm::vec3(1.0f, 0.3f, 0.5f)));
+                    glDrawArrays(GL_TRIANGLES, 0, 36);
+                }
             }
 
             /* lamp object */
             {
                 glUseProgram(light_cube_program);
                 glBindVertexArray(light_source_vao);
-                glUniformMatrix4fv(glGetUniformLocation(light_cube_program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
-                glUniformMatrix4fv(glGetUniformLocation(light_cube_program, "view"), 1, GL_FALSE, glm::value_ptr(camera.view));
-                glUniformMatrix4fv(glGetUniformLocation(light_cube_program, "model"), 1, GL_FALSE, glm::value_ptr(glm::scale(glm::translate(glm::mat4(1.0f), light_position), glm::vec3(0.2f))));
-                glDrawArrays(GL_TRIANGLES, 0, 36);
 
+                program_set(light_cube_program, "view", camera.view);
+                program_set(light_cube_program, "projection", projection);
+
+                for (int i = 0; i < 4; i++) {
+                    program_set(light_cube_program, "model", glm::scale(glm::translate(glm::mat4(1.0f), point_light_positions[i]), glm::vec3(0.2f)));
+                    glDrawArrays(GL_TRIANGLES, 0, 36);
+                }
             }
         }
 

src/shader.cpp

@@ -103,3 +103,28 @@ done:
     if (fragment_shader_source) free(fragment_shader_source);
     return ret;
 }
+
+void program_set(unsigned int program, const char *uniform, int value)
+{
+    glUniform1i(glGetUniformLocation(program, uniform), value); 
+}
+
+void program_set(unsigned int program, const char *uniform, float value)
+{
+    glUniform1f(glGetUniformLocation(program, uniform), value); 
+}
+
+void program_set(unsigned int program, const char *uniform, glm::vec3 vec)
+{
+    glUniform3fv(glGetUniformLocation(program, uniform), 1, &vec[0]); 
+}
+
+void program_set(unsigned int program, const char *uniform, float x, float y, float z)
+{
+    glUniform3f(glGetUniformLocation(program, uniform), x, y, z);
+}
+
+void program_set(unsigned int program, const char *uniform, const glm::mat4 &mat)
+{
+    glUniformMatrix4fv(glGetUniformLocation(program, uniform), 1, GL_FALSE, &mat[0][0]);
+}

src/shader.hpp

@@ -1,4 +1,11 @@
 #pragma once
 
+#include "vendor/glm/glm/mat4x4.hpp"
+#include "vendor/glm/glm/vec3.hpp"
 
 unsigned int create_program(const char *vertex_shader_path, const char *fragment_shader_path);
+void program_set(unsigned int program, const char *uniform, int value);
+void program_set(unsigned int program, const char *uniform, float value);
+void program_set(unsigned int program, const char *uniform, glm::vec3 vec);
+void program_set(unsigned int program, const char *uniform, float x, float y, float z);
+void program_set(unsigned int program, const char *uniform, const glm::mat4 &mat);