Added Fog

assets/shaders/blinn_phong.frag

@@ -1,4 +1,4 @@
-//include common.glsl commonFrag.glsl version.glsl
+//include fog.glsl common.glsl commonFrag.glsl version.glsl
 
 struct Light
 {
@@ -21,8 +21,6 @@ const int LT_POINT   = 2;
 
 const int MAX_LIGHTS = 128;
 
-uniform vec3 camera_pos;
-
 uniform sampler2D diffuse_texture;
 uniform Light lights[MAX_LIGHTS];
 uniform int total_active_lights;
@@ -128,6 +126,5 @@ void main()
 			light_contribution += calc_spot_light(lights[i]);
 	}
 	
-	 frag_color = (albedo_color * vec4(0.1, 0.1, 0.1, 1.0)) +
-	 	          (albedo_color * vec4(light_contribution, 1.0));
+	frag_color = apply_fog((albedo_color * vec4(light_contribution + ambient_light, 1.0)));
 }

assets/shaders/commonFrag.glsl

@@ -8,3 +8,6 @@ in vec3 vertex;
 
 // Fragment Shader Output
 //out vec4 frag_color;
+
+uniform vec3 ambient_light;
+uniform vec3 camera_pos;

assets/shaders/fog.glsl

@@ -1,41 +1,41 @@
 struct Fog
 {
-	int fogMode;
+	int mode;
 	float density;
-	float start;
-	float max;
-	vec4 color;
+	float start_dist;
+	float max_dist;
+	vec3 color;
 };
 
 uniform Fog fog;
 
-const int FOG_NONE             = 0;
-const int FOG_LINEAR           = 1;
-const int FOG_EXPONENTIAL      = 2;
-const int FOG_EXPONENTIAL_SQRD = 3;
+const int FM_NONE             = 0;
+const int FM_LINEAR           = 1;
+const int FM_EXPONENTIAL      = 2;
+const int FM_EXPONENTIAL_SQRD = 3;
 
-vec4 applyFog(vec4 color)
+vec4 apply_fog(vec4 color)
 {
-	vec4 finalColor = color;
-	if(fog.fogMode != FOG_NONE)
+	vec4 final_color = color;
+	if(fog.mode != FM_NONE)
 	{
-		float fogFactor;
-		float distFromEye = abs(length(vertex - eyePos));
-		if(fog.fogMode == FOG_LINEAR)
+		float fog_factor;
+		float dist_from_eye = abs(length(vertex - camera_pos));
+		if(fog.mode == FM_LINEAR)
 		{
-			fogFactor = (fog.max - distFromEye) / (fog.max - fog.start);
+			fog_factor = (fog.max_dist - dist_from_eye) / (fog.max_dist - fog.start_dist);
 		}
-		else if(fog.fogMode == FOG_EXPONENTIAL)
+		else if(fog.mode == FM_EXPONENTIAL)
 		{
-			fogFactor = exp(fog.density * -distFromEye);
+			fog_factor = exp(fog.density * -dist_from_eye);
 		}
-		else if(fog.fogMode == FOG_EXPONENTIAL_SQRD)
+		else if(fog.mode == FM_EXPONENTIAL_SQRD)
 		{
-			fogFactor = exp(-pow(fog.density * distFromEye, 2));
+			fog_factor = exp(-pow(fog.density * dist_from_eye, 2));
 		}
-		fogFactor = clamp(fogFactor, 0.0, 1.0);
-		finalColor = mix(fog.color, color, fogFactor);
+		fog_factor = clamp(fog_factor, 0.0, 1.0);
+		final_color = mix(vec4(fog.color, 1.0), color, fog_factor);
 	}
-	return finalColor;
+	return final_color;
 }
 

assets/shaders/unshaded.frag

@@ -1,23 +1,10 @@
-//include common.glsl commonFrag.glsl version.glsl
+//include fog.glsl common.glsl commonFrag.glsl version.glsl
 
 uniform sampler2D diffuse_texture;
 
-out vec4 gbuffer[4];
+out vec4 frag_color;
 
 void main()
 {
-	// gl_FragData[0] = diffuse_color * texture(diffuse_texture, uv);
-	// gl_FragData[1] = vec4(vertex.xyz, 1.0);
-	// gl_FragData[2] = vec4(normal.xyz, 1.0);
-	// gl_FragData[3] = vec4(uv, 0.0, 1.0);
-
-	gbuffer[0] = diffuse_color * texture(diffuse_texture, uv);
-	gbuffer[1] = vec4(vertex.xyz, 1.0);
-	gbuffer[2] = vec4(normalize(normal.xyz), 1.0);
-	gbuffer[3] = vec4(uv, 0.0, 1.0);
-
-	// gbuffer[0] = (diffuse_color * texture(diffuse_texture, uv)).xyz;
-	// gbuffer[1] = vertex.xyz;
-	// gbuffer[2] = normal.xyz;
-	// gbuffer[3] = vec3(uv, 0.0);
+	frag_color = apply_fog(diffuse_color * texture(diffuse_texture, uv));
 }

src/game.c

@@ -157,7 +157,7 @@ void scene_setup(void)
 	/* model_set_material_param(screen_model, "diffuse_color", &color); */
 	/* model_set_material_param(screen_model, "diffuse_texture", &cam->render_tex); */
 
-	const int MAX_LIGHTS = 2;
+	const int MAX_LIGHTS = 3;
 	for(int i = 0; i < MAX_LIGHTS; i++)
 	{
 		int x = rand() % MAX_LIGHTS;
@@ -172,9 +172,9 @@ void scene_setup(void)
 		light_comp->intensity = 1.f;
 	}
 
-	struct Entity* sun = scene_add_new("Sun", NULL);
-	struct Light* sun_light = entity_component_add(sun, C_LIGHT, LT_DIR);
-	sun_light->intensity = 0.8f;
+	/* struct Entity* sun = scene_add_new("Sun", NULL); */
+	/* struct Light* sun_light = entity_component_add(sun, C_LIGHT, LT_DIR); */
+	/* sun_light->intensity = 0.8f; */
 }
 
 void debug(float dt)

src/material.c

@@ -42,13 +42,28 @@ void material_init(void)
 	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
 
 	uniform = array_grow(unshaded_mat->pipeline_params, struct Uniform);
-	uniform->name = str_new("view_mat");
-	uniform->type = UT_MAT4;
+	uniform->name = str_new("fog.mode");
+	uniform->type = UT_INT;
 	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
 
 	uniform = array_grow(unshaded_mat->pipeline_params, struct Uniform);
-	uniform->name = str_new("inv_model_mat");
-	uniform->type = UT_MAT4;
+	uniform->name = str_new("fog.density");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
+
+	uniform = array_grow(unshaded_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.start_dist");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
+
+	uniform = array_grow(unshaded_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.max_dist");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
+
+	uniform = array_grow(unshaded_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.color");
+	uniform->type = UT_VEC3;
 	uniform->location = shader_get_uniform_location(unshaded_mat->shader, uniform->name);
 
 	/* Material params */
@@ -95,6 +110,36 @@ void material_init(void)
 	uniform->type = UT_MAT4;
 	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
 
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.mode");
+	uniform->type = UT_INT;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.density");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.start_dist");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.max_dist");
+	uniform->type = UT_FLOAT;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("fog.color");
+	uniform->type = UT_VEC3;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+
+	uniform = array_grow(blinn_phong_mat->pipeline_params, struct Uniform);
+	uniform->name = str_new("ambient_light");
+	uniform->type = UT_VEC3;
+	uniform->location = shader_get_uniform_location(blinn_phong_mat->shader, uniform->name);
+	
 	/* Material params */
 	uniform = array_grow(blinn_phong_mat->model_params, struct Uniform);
 	uniform->name = str_new("diffuse_color");

src/model.c

@@ -138,6 +138,7 @@ void model_render_all(struct Camera* camera)
 			}
 
 			/* Set pipeline uniforms */
+			struct Render_Settings* render_settings = renderer_get_settings();
 			for(int k = 0; k < array_len(material->pipeline_params); k++)
 			{
 				/* TODO: change this into something better */
@@ -167,6 +168,36 @@ void model_render_all(struct Camera* camera)
 					shader_set_uniform(uniform->type, uniform->location, &inv_mat);
 					renderer_check_glerror("model:render_all:material_pipeline");
 				}
+				else if(strcmp(uniform->name, "fog.mode") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->fog.mode);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
+				else if(strcmp(uniform->name, "fog.density") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->fog.density);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
+				else if(strcmp(uniform->name, "fog.start_dist") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->fog.start_dist);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
+				else if(strcmp(uniform->name, "fog.max_dist") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->fog.max_dist);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
+				else if(strcmp(uniform->name, "fog.color") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->fog.color);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
+				else if(strcmp(uniform->name, "ambient_light") == 0)
+				{
+					shader_set_uniform(uniform->type, uniform->location, &render_settings->ambient_light);
+					renderer_check_glerror("model:render_all:material_pipeline");
+				}
 			}
 
 			if(material->lit)	/* Set light information */

src/renderer.c

@@ -21,6 +21,7 @@ static int def_albedo_tex = -1;
 static int def_depth_tex = -1;
 static int quad_geo = -1;
 static int composition_shader = -1;
+static struct Render_Settings settings;
 
 void on_framebuffer_size_change(GLFWwindow* window, int width, int height);
 
@@ -33,6 +34,13 @@ void renderer_init(GLFWwindow* window)
 	glCullFace(GL_BACK);
 	glfwSetFramebufferSizeCallback(window, on_framebuffer_size_change);
 
+	settings.fog.mode = FM_EXPONENTIAL;
+	settings.fog.density = 0.01f;
+	settings.fog.start_dist = 50.f;
+	settings.fog.max_dist = 150.f;
+	vec3_fill(&settings.fog.color, 60.f/255.f, 60.f/255.f, 75.f/255.f);
+	vec3_fill(&settings.ambient_light, 0.1f, 0.1f, 0.12f);
+	
 	/* Quad geometry for final render */
 	vec3* vertices = array_new(vec3);
 	vec2* uvs = array_new(vec2);
@@ -200,3 +208,8 @@ int renderer_check_glerror(const char* context)
 
 	return error;
 }
+
+struct Render_Settings* renderer_get_settings(void)
+{
+	return &settings;
+}

src/renderer.h

@@ -1,8 +1,36 @@
 #ifndef renderer_H
 #define renderer_H
 
+#include "linmath.h"
+
+enum Fog_Mode
+{
+	FM_NONE             = 0,
+	FM_LINEAR           = 1,
+	FM_EXPONENTIAL      = 2,
+	FM_EXPONENTIAL_SQRD = 3
+};
+
+struct Fog
+{
+	int mode;
+	float density;
+	float start_dist;
+	float max_dist;
+	vec3 color;
+};
+
+
+struct Render_Settings
+{
+	struct Fog fog;
+	vec3 ambient_light;
+};
+
+
 typedef struct GLFWwindow GLFWwindow;
 
+struct Render_Settings* renderer_get_settings(void);
 void renderer_init(GLFWwindow* window);
 void renderer_draw(void);
 void renderer_cleanup(void);