From aac94e911b0bab8db5cdb5efb8d4d8f2d4072610 Mon Sep 17 00:00:00 2001
From: Loic Guegan <manzerbredes@mailbox.org>
Date: Tue, 7 Jul 2020 06:40:50 +0200
Subject: Add code

---
 resources/fonts/arial.ttf                      | Bin 0 -> 296712 bytes
 resources/shaders/algorithms/ray_marching.glsl |   5 ++
 resources/shaders/main.glsl                    |  77 +++++++++++++++++++++++--
 resources/shaders/objects/sphere.glsl          |   4 ++
 4 files changed, 81 insertions(+), 5 deletions(-)
 create mode 100644 resources/fonts/arial.ttf
 create mode 100644 resources/shaders/algorithms/ray_marching.glsl
 create mode 100644 resources/shaders/objects/sphere.glsl

(limited to 'resources')

diff --git a/resources/fonts/arial.ttf b/resources/fonts/arial.ttf
new file mode 100644
index 0000000..12cc15c
Binary files /dev/null and b/resources/fonts/arial.ttf differ
diff --git a/resources/shaders/algorithms/ray_marching.glsl b/resources/shaders/algorithms/ray_marching.glsl
new file mode 100644
index 0000000..d984c0e
--- /dev/null
+++ b/resources/shaders/algorithms/ray_marching.glsl
@@ -0,0 +1,5 @@
+
+
+RayMarching(vec3 ro, vec3 rd){
+	
+}
\ No newline at end of file
diff --git a/resources/shaders/main.glsl b/resources/shaders/main.glsl
index 7d4067a..2888d56 100644
--- a/resources/shaders/main.glsl
+++ b/resources/shaders/main.glsl
@@ -18,9 +18,76 @@ uniform float time;
 
 out vec3 color;
 
-void main(){
-	vec2 coord=gl_FragCoord.xy/resolution;
-	coord-=0.5;
-	float d=length(coord);
-	color=vec3(d,1,1);
+
+#define MAX_STEPS 100
+#define MAX_DIST 100.
+#define SURF_DIST .01
+
+float GetDist(vec3 p) {
+	vec4 s = vec4(0, 1, 6, 1);
+    
+    float sphereDist =  length(p-s.xyz)-s.w;
+    float planeDist = p.y;
+    
+    float d = min(sphereDist, planeDist);
+    return d;
+}
+
+float RayMarch(vec3 ro, vec3 rd) {
+	float dO=0.;
+    
+    for(int i=0; i<MAX_STEPS; i++) {
+    	vec3 p = ro + rd*dO;
+        float dS = GetDist(p);
+        dO += dS;
+        if(dO>MAX_DIST || dS<SURF_DIST) break;
+    }
+    
+    return dO;
+}
+
+vec3 GetNormal(vec3 p) {
+	float d = GetDist(p);
+    vec2 e = vec2(.01, 0);
+    
+    vec3 n = d - vec3(
+        GetDist(p-e.xyy),
+        GetDist(p-e.yxy),
+        GetDist(p-e.yyx));
+    
+    return normalize(n);
+}
+
+float GetLight(vec3 p) {
+    vec3 lightPos = vec3(0, 5, 6);
+    lightPos.xz += vec2(sin(time), cos(time))*2.;
+    vec3 l = normalize(lightPos-p);
+    vec3 n = GetNormal(p);
+    
+    float dif = clamp(dot(n, l), 0., 1.);
+    float d = RayMarch(p+n*SURF_DIST*2., l);
+    if(d<length(lightPos-p)) dif *= .1;
+    
+    return dif;
+}
+
+void main()
+{
+    vec2 uv = (gl_FragCoord.xy-.5*resolution.xy)/resolution.y;
+
+    vec3 col = vec3(0);
+    
+    vec3 ro = vec3(0, 1, 0);
+    vec3 rd = normalize(vec3(uv.x, uv.y, 1));
+
+    float d = RayMarch(ro, rd);
+    
+    vec3 p = ro + rd * d;
+    
+    float dif = GetLight(p);
+    col = vec3(dif);
+    
+    col = pow(col, vec3(.4545));	// gamma correction
+    
+    color = col;
 }
diff --git a/resources/shaders/objects/sphere.glsl b/resources/shaders/objects/sphere.glsl
new file mode 100644
index 0000000..a3d25eb
--- /dev/null
+++ b/resources/shaders/objects/sphere.glsl
@@ -0,0 +1,4 @@
+
+float Sphere(vec3 ray_position, vec3 sphere_position){
+	
+}
\ No newline at end of file
-- 
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