everything is chrome in the future

shader/include/constants.glsl

@@ -1,4 +1,9 @@
 const float INF = 50.0;
 const float PI = 3.14159;
 const float E = 2.71828;
-const int BOUNCES = 3;
+const int BOUNCES = 4;
+
+// materials
+const int MAT_SKY = -1;
+const int MAT_LAMBERT = 0;
+const int MAT_CHROME = 1;

shader/include/intersect.glsl

@@ -17,12 +17,12 @@ void intersectSphere(Ray ray, inout RayHit bestHit, Sphere sphere)
         bestHit.position = ray.origin + t * ray.direction;
         bestHit.normal = normalize(bestHit.position-c);
         bestHit.albedo = sphere.albedo;
+        bestHit.material = sphere.material;
     }
 }
 
 void intersectPlane(Ray ray, inout RayHit bestHit, vec3 p, vec3 normal)
 {
-    //normal = vec3(0.0,0.0,1.0);
     float denom = dot(normal, ray.direction);
 
     if (abs(denom) > 0.0001)
@@ -34,6 +34,7 @@ void intersectPlane(Ray ray, inout RayHit bestHit, vec3 p, vec3 normal)
             bestHit.position = ray.origin + t*ray.direction;
             bestHit.normal = normal;
             bestHit.albedo = vec3(1.0,1.0,1.0);
+            bestHit.material = MAT_LAMBERT;
         }
     }
 }

shader/include/lighting.glsl

@@ -33,11 +33,20 @@ vec3 sampleHemisphere(vec3 normal)
 }
 
 
+vec3 scatterMetal(inout Ray ray, RayHit hit)
+{
+    ray.origin = hit.position + hit.normal*0.001;
+    ray.direction = reflect(ray.direction,hit.normal);
+    ray.energy *= 0.5;
+
+    return vec3(0.0);
+}
+
 vec3 scatterLambert(inout Ray ray, RayHit hit)
 {
     ray.origin = hit.position + hit.normal*0.001;
     ray.direction = sampleHemisphere(hit.normal);
-    ray.energy *= 2.0 * hit.albedo * sdot(hit.normal, ray.direction);
+    ray.energy *= hit.albedo * sdot(hit.normal, ray.direction);
 
     return vec3(0.0);
 }

shader/include/ray.glsl

@@ -21,6 +21,7 @@ struct RayHit
     float distance;
     vec3 normal;
     vec3 albedo;
+    int material;
 };
 RayHit createRayHit()
 {

shader/include/scene.glsl

@@ -3,8 +3,10 @@ RayHit trace(Ray ray)
     RayHit hit = createRayHit();
 
     Sphere s;
-    s.cr = vec4(0.0,0.0,0.0,2.0);
+    s.cr = vec4(0.0,0.0,0.0,5.0);
     s.albedo = vec3(1.0,0.0,0.0);
+    s.material = MAT_CHROME;
+    intersectSphere(ray, hit, s);
 
     intersectPlane(ray, hit, vec3(0.0,-1.5,0.0),vec3(0.0,1.0,0.0));
 

shader/include/sphere.glsl

@@ -3,9 +3,10 @@ struct Sphere
     // (c.x,c.y,c.z,r)
     vec4 cr;
     vec3 albedo;
+    int material;
 };
 
-// 253 is the maximum?? TODO: use uniform buffer objects
-const int SPHERES = 250; 
+// TODO: use uniform buffer objects
+const int SPHERES = 167;
 uniform int _activeSpheres;
 layout (location = 1)  uniform Sphere _spheres[SPHERES];

shader/root/rt.glsl

@@ -29,7 +29,16 @@ vec3 shade(inout Ray ray, RayHit hit)
 {
     if (hit.distance < INF)
     {
-        return scatterLambert(ray, hit);
+        switch (hit.material)
+        {
+        case MAT_SKY: break;
+        case MAT_LAMBERT: 
+            scatterLambert(ray, hit);
+            break;
+        case MAT_CHROME: 
+            return scatterMetal(ray, hit);
+            break;
+        }
     }
 
     // sky color
@@ -78,15 +87,8 @@ void main()
         if (length(ray.energy) < 0.001) break;
     }
 
-    //pixel.xyz = mix(pixel.xyz, normal, 1.0-depth);
     pixel.xyz = mix(pixel.xyz, vec3(1.0), depth);
 
-    //pixel.xyz = mix(firstHit.albedo, pixel.xyz, depth);
-
-    //pixel.a = 1.0;
-
-    //pixel.xyz = texture(_g0, uv).xyz;
-
     // output to a specific pixel in the image
     imageStore(img_output, ivec2(gl_GlobalInvocationID.xy), pixel);
 }

src/sphere.c

@@ -38,11 +38,12 @@ void makeSpheres(struct Sphere *spheres, int count)
         glm_vec3_scale(col, 0.5, col);
         glm_vec3_adds(col, 0.5, col);
 
-        spheres[i] = makeSphere(sc,radius,col);
+        int material = i % 2 == 0;
+        spheres[i] = makeSphere(sc,radius,col,material);
     }
 }
 
-struct Sphere makeSphere(vec3 center, float radius, vec3 albedo)
+struct Sphere makeSphere(vec3 center, float radius, vec3 albedo, int material)
 {
     struct Sphere s;
 
@@ -53,20 +54,22 @@ struct Sphere makeSphere(vec3 center, float radius, vec3 albedo)
 
     glm_vec3_copy(albedo, s.albedo);
 
+    s.material = material;
+
     return s;
 }
 
-void updateSphereUniform(GLuint shaderProgram, struct Sphere sphere)
-{
-    int scrloc, saloc;
-    scrloc = glGetUniformLocation(shaderProgram, "_sphere.cr");
-    saloc = glGetUniformLocation(shaderProgram, "_sphere.albedo");
-
-    glUniform4fv(scrloc, 1, sphere.cr);
-    glUniform3fv(saloc, 1, sphere.albedo);
-
-    updateSphereUniforms(shaderProgram, &sphere, 0);
-}
+//void updateSphereUniform(GLuint shaderProgram, struct Sphere sphere)
+//{
+//    int scrloc, saloc;
+//    scrloc = glGetUniformLocation(shaderProgram, "_sphere.cr");
+//    saloc = glGetUniformLocation(shaderProgram, "_sphere.albedo");
+//
+//    glUniform4fv(scrloc, 1, sphere.cr);
+//    glUniform3fv(saloc, 1, sphere.albedo);
+//
+//    updateSphereUniforms(shaderProgram, &sphere, 0);
+//}
 
 void updateSphereUniforms(GLuint shaderProgram, struct Sphere *spheres, int count)
 {
@@ -75,7 +78,7 @@ void updateSphereUniforms(GLuint shaderProgram, struct Sphere *spheres, int coun
     glUniform1i(loc, count);
 
     // each sphere takes up two uniform locations
-    const int stride = 2;         
+    const int stride = 3;
 
     // first location in the array
     loc = glGetUniformLocation(shaderProgram, "_spheres[0].cr"); 
@@ -85,5 +88,6 @@ void updateSphereUniforms(GLuint shaderProgram, struct Sphere *spheres, int coun
         struct Sphere s = spheres[i];
         glUniform4fv(loc+i*stride,   1,  s.cr);
         glUniform3fv(loc+i*stride+1, 1,  s.albedo);
+        glUniform1i( loc+i*stride+2, s.material);
     }
 }

src/sphere.h

@@ -13,9 +13,10 @@ struct Sphere
 {
     vec4 cr;
     vec3 albedo;
+    int material;
 };
 
 void makeSpheres(struct Sphere *spheres, int count);
-struct Sphere makeSphere(vec3 center, float radius, vec3 albedo);
-void updateSphereUniform(GLuint shaderProgram, struct Sphere sphere);
+struct Sphere makeSphere(vec3 center, float radius, vec3 albedo, int material);
+//void updateSphereUniform(GLuint shaderProgram, struct Sphere sphere);
 void updateSphereUniforms(GLuint shaderProgram, struct Sphere *spheres, int count);

todo.md

@@ -11,7 +11,8 @@
             * [x] perspective
             * [x] camera lookat
             * [x] do a bounce
-            * [ ] do a 'flect
+            * [x] do a 'flect
+            * [ ] properly sample depth for reflective surfaces
             * [ ] do a 'fract
             * [ ] depth of field
             * [ ] emission