grouped files in subdirs.

game/renderer_ray_tracer/raycaster.fs

@@ -0,0 +1,234 @@
+R"raw_string(
+#version 120
+
+struct intersection
+{
+	bool intersected;
+	vec3 point;
+	vec3 normal;
+	vec3 color;
+	float reflection;
+	int idx;
+	//todo different types
+};
+
+varying vec2 outvertex;
+
+//settings
+uniform float aspectratio;
+uniform float time;
+uniform int supersamples;
+uniform int reflections;
+uniform bool shadows;
+uniform vec3 backgroundcolor;
+
+//light
+uniform vec3 l_position;
+uniform float l_radius;
+
+//spheres
+//todo ubo?
+uniform int s_length;
+uniform vec3 s_positions[100];
+uniform float s_radii[100];
+uniform vec4 s_colors[100];
+uniform float s_reflections[100];
+
+const float PI = 3.14159265359;
+
+//din = german industrial normal
+float light_diffuse(vec3 pos, vec3 din)
+{
+	vec3 l_dir = normalize(l_position - pos);
+	return max(dot(l_dir, din), 0.0f);
+}
+
+//adapted from https://wiki.delphigl.com/index.php/shader_ConeVolumeShadow
+float light_shadow(vec3 pos)
+{
+	float s = 1.0f;
+
+	for(int l = 0; l < s_length; l++)
+	{
+		vec3 s_pos = s_positions[l];
+		float s_rad = s_radii[l];
+
+		// project fragment (pos) on the cone axis => F_
+		vec3 nvLO = s_pos - l_position;
+		float dLO = length(nvLO);
+		nvLO /= dLO;
+		vec3 vLF = pos - l_position;
+		float dLF_ = dot(vLF, nvLO);
+		if (dLF_ < dLO) {
+			// fragment before occluder => no shadow
+			continue;
+		}
+		vec3 F_ = l_position + dLF_ * nvLO;
+		float rF = distance(F_, pos);
+
+		// compute outer and inner radius at F_
+		float rF_outer = (s_rad + l_radius) * (dLF_ / dLO) - l_radius;
+		if (rF >= rF_outer) {
+			// outside the outer cone => no shadow
+			continue;
+		}
+		float rF_inner = (s_rad - l_radius) * (dLF_ / dLO) + l_radius;
+		if (rF_inner >= rF) {
+			// inside the inner cone => full shadow
+			return 0.0;
+		}
+		else if (rF_inner >= 0.0 || rF >= -rF_inner) {
+			// soft shadow, linear interpolation
+			s *= (rF - rF_inner) / (rF_outer - rF_inner);
+		}
+		else {
+			// light from both sides of the occluder
+			s *= (-2.0*rF_inner) / (rF_outer - rF_inner);
+		}
+
+	}
+
+	return s;
+}
+
+intersection intersect_sphere(vec3 r_pos, vec3 r_dir, vec3 s_pos, float s_rad, inout float minimum)
+{
+	intersection result = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+
+	vec3 v = r_pos - s_pos;
+	float a = dot(r_pos, r_pos);
+	float b = dot(v, r_dir);
+	float c = dot(v, v) - (s_rad * s_rad);
+	float d = b * b - c;
+
+	if(d >= 0)
+	{
+		float w1 = -b - sqrt(d);
+		float w2 = -b + sqrt(d);
+
+		if(w1 > 0.0f || w2 > 0.0f)
+		{
+			float w = min(w1, w2);
+			float o = max(w1, w2);
+
+			if(w1 <= 0.0f)
+				w = w2;
+			else
+			if(w2 <= 0.0f)
+				w = w1;
+
+			if(w < minimum)
+			{
+				minimum = w;
+			}
+			else
+			{
+				return intersection(false,vec3(0.0f, 0.0f, 0.0f),
+							  vec3(0.0f, 0.0f, 0.0f),
+							  vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+			}
+
+			vec3 p = r_pos + (w * r_dir);
+			result.intersected = true;
+			result.point = p;
+			result.normal = normalize((p - s_pos) / s_rad);
+			return result;
+		}
+	}
+
+	return result;
+}
+
+intersection intersect(vec3 r_pos, vec3 r_dir, int idx)
+{
+	intersection result = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f),
+						 vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+	float minimum = 1000.0f;
+
+	for(int l = 0; l < s_length; l++)
+	{
+		if(idx == l)
+			continue;
+
+		float maximum;
+
+		intersection r = intersect_sphere(r_pos, r_dir, s_positions[l], s_radii[l], minimum);
+		if(r.intersected)
+		{
+			r.color = s_colors[l].rgb;
+			r.idx = l;
+			r.reflection = s_reflections[l];
+
+			result = r;
+		}
+		//todo other geometric objects
+		//todo handle min with other geometric objects
+	}
+
+	return result;
+}
+
+vec3 cast_ray(vec3 r_pos, vec3 r_pixel)
+{
+	vec3 r_dir = normalize(r_pixel - r_pos);
+
+	vec3 color = backgroundcolor;
+
+	intersection i = intersection(false,vec3(0.0f, 0.0f, 0.0f),
+					    vec3(0.0f, 0.0f, 0.0f),
+					    vec3(0.0f, 0.0f, 0.0f), 0.0f, -1);
+
+	vec3 p = r_pos;
+	vec3 d = r_dir;
+	int idx = -1;
+
+	for(int bounce = 0; bounce < reflections; bounce++)
+	{
+		intersection i = intersect(p,d, idx);
+
+		if(i.intersected)
+		{
+			float l_factor = light_diffuse(i.point, i.normal);
+
+			if(shadows && l_factor > 0.004f)
+			{
+				l_factor *= light_shadow(i.point);
+			}
+
+			if(bounce == 0)
+			{
+				color = i.color * l_factor;
+			}
+			else
+			{
+				color = mix(color, color * i.color * l_factor, i.reflection);
+			}
+
+			//d = 2*(dot(p, i.normal))*i.normal - p;
+			d = reflect(-p, i.normal);
+			p = i.point;
+			idx = i.idx;
+		}
+		else
+			break;
+	}
+
+	return color;
+}
+
+void main() 
+{
+	vec2 rp = outvertex;
+	rp.x = rp.x * aspectratio;
+	vec4 outcolor = vec4(cast_ray(vec3(0.0f, 0.0f, 1.0f), vec3(rp, 0.0f)), 0.0f);
+	for(int supersample = 1; supersample < supersamples; supersample++)
+	{
+		outcolor = mix(outcolor, vec4(cast_ray(vec3(sin(supersample * PI/supersamples)/200, cos(supersample * PI/supersamples)/200, 1.0f), vec3(rp, 0.0f)), 0.0f), 0.5f);
+	}
+  gl_FragColor = outcolor;
+}
+
+)raw_string"

game/renderer_ray_tracer/raycaster.vs

@@ -0,0 +1,13 @@
+R"raw_string(
+#version 120
+
+attribute vec2 invertex;
+varying vec2 outvertex;
+
+void main() {
+     gl_Position.xy = invertex;
+     gl_Position.zw = vec2(0.0f, 1.0);
+     outvertex = invertex;
+}
+
+)raw_string"

game/renderer_ray_tracer/renderer_ray_tracer.cpp

@@ -0,0 +1,88 @@
+#include "renderer_ray_tracer.hpp"
+
+#include <vector>
+#include "glm/glm.hpp"
+#include "glm/vec2.hpp"
+#include "glm/vec3.hpp"
+#include "glm/gtc/type_ptr.hpp"
+
+static const char *vss =
+#include "raycaster.vs"
+;
+
+static const char *fss =
+#include "raycaster.fs"
+;
+
+
+namespace endofthejedi {
+    RendererRayTracer::RendererRayTracer() {
+        m_shader.load(vss, GL_VERTEX_SHADER);
+        m_shader.load(fss, GL_FRAGMENT_SHADER);
+    }
+
+    void RendererRayTracer::render(const game::State *state) {
+        m_shader.bind();
+
+        std::vector<glm::vec3> positions;
+        std::vector<glm::vec4> colors;
+        std::vector<GLfloat> radii;
+        std::vector<GLfloat> reflections;
+
+        for (const game::Planet *planet : state->planets) {
+            positions.push_back(glm::vec3(planet->position, -5.0f));
+            radii.push_back(planet->radius);
+            colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+        }
+
+        for (const game::Ship *ship : state->ships) {
+            positions.push_back(glm::vec3(ship->position, -3.0f));
+            radii.push_back(ship->radius);
+            colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+        }
+
+        for (const game::Player *player : state->players) {
+            for (const game::Missile *missile : player->missiles) {
+                positions.push_back(glm::vec3(missile->position, -3.0f));
+                radii.push_back(0.01f);
+                colors.push_back(glm::vec4(1.0f, 0.0f, 0.0f, 0.5f));
+            }
+        }
+
+        for (auto &pos : positions) {
+            pos.x *= 5;
+            pos.y *= 5;
+        }
+        for (auto &rad : radii) {
+            rad *= 5;
+        }
+
+        /*
+        for (const game::Trace *trace : state->traces) {
+          positions.push_back(glm::vec3(trace->position, -3.0f));
+          radii.push_back(trace->radius);
+          colors.push_back(glm::vec4(0.0f, 1.0f, 0.0f, 0.5f));
+          }*/
+
+        glUniform1f(m_shader.location("aspectratio"), 1.0f);
+        glUniform1i(m_shader.location("reflections"), 1);
+        glUniform3f(m_shader.location("l_position"), 0.6f, 0.1f, 0.0f);
+        glUniform1f(m_shader.location("l_radius"), 1.0f);
+        glUniform3fv(m_shader.location("s_positions"), positions.size(),
+                     glm::value_ptr(positions[0]));
+
+        glUniform4fv(m_shader.location("s_colors"), colors.size(),
+                     glm::value_ptr(colors[0]));
+
+        glUniform1fv(m_shader.location("s_radii"), radii.size(), &radii[0]);
+        glUniform1i(m_shader.location("s_length"), positions.size());
+
+        // render fullscreen quad with legacy opengl (too lazy, sorry)
+        glBegin(GL_QUADS);
+        glVertex2f(-1.0f, -1.0f);
+        glVertex2f(1.0f, -1.0f);
+        glVertex2f(1.0f, 1.0f);
+        glVertex2f(-1.0f, 1.0f);
+        glEnd();
+    }
+}

game/renderer_ray_tracer/renderer_ray_tracer.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "renderer.hpp"
+
+#include "glclasses.hpp"
+#include "game.hpp"
+#include "state/planet.hpp"
+#include "state/trace.hpp"
+#include "state/player.hpp"
+#include "state/ship.hpp"
+
+namespace endofthejedi {
+
+    class RendererRayTracer: Renderer {
+        private:
+            Shader m_shader;
+        protected:
+        public:
+            RendererRayTracer();
+            void render(const game::State *state) override;
+    };
+
+}