add engine version

1 files changed, 63 insertions, 0 deletions

diff --git a/engine-ocean/Resources/Shaders/water.frag b/engine-ocean/Resources/Shaders/water.frag
new file mode 100644
index 0000000..b86e3a9
--- /dev/null
+++ b/engine-ocean/Resources/Shaders/water.frag
@@ -0,0 +1,63 @@
+#version 330 core
+// Uniforms for shape information
+//in vec3 worldSpace_pos;
+//in vec3 worldSpace_norm;
+
+in float visibility;
+in vec4 clipSpace;
+in vec2 tex_coord;
+in vec3 toCameraVector;
+
+
+
+// Camera uniform
+uniform vec3 worldSpace_camPos;
+uniform sampler2D reflect_texture;
+uniform sampler2D refract_texture;
+uniform sampler2D du_dv_map;
+uniform float moveFactor; // offset that changes over time
+
+out vec4 fragColor;
+
+const float distortionStrength = .02f;
+const vec4 waterColor = vec4(.06f, .49f, .59f, 1.f);
+uniform vec3 skyColor;
+
+
+void main() {
+
+    // screen space coords
+    vec2 ndc = (clipSpace.xy/clipSpace.w)/2.f + .5f;
+
+    vec2 refractTexCoords = ndc;
+    vec2 reflectTexCoords = vec2(ndc.x, ndc.y);
+
+    // get associated rg color in the range -1,1 from du_dv map
+    vec2 distortion1 = (texture(du_dv_map, vec2(tex_coord.x + moveFactor, tex_coord.y)).rg*2.f - 1.f) * distortionStrength;
+    vec2 distortion2 = (texture(du_dv_map, vec2(-tex_coord.x + moveFactor, tex_coord.y + moveFactor)).rg*2.f - 1.f) * distortionStrength;
+    vec2 totalDistortion = distortion1 + distortion2;
+
+    refractTexCoords += totalDistortion;
+    reflectTexCoords += totalDistortion;
+
+    refractTexCoords = clamp(refractTexCoords, 0.001f, .999f);
+    reflectTexCoords = clamp(reflectTexCoords, 0.001f, .999f);
+
+    // fresnel effect
+    vec3 viewVector = normalize(toCameraVector);
+    float refractiveFactor = dot(viewVector, vec3(0.f, 1.f, 0.f));
+    refractiveFactor = pow(refractiveFactor, 5.f); // changes how reflective water is
+
+
+
+
+
+    vec4 reflect = texture(reflect_texture, reflectTexCoords);
+    vec4 refract = texture(refract_texture, refractTexCoords);
+
+
+    // mix actual color with fog color
+    fragColor = mix(reflect, refract, refractiveFactor);
+    fragColor = mix(fragColor, waterColor, .2f);
+    fragColor = mix(vec4(skyColor, 1.f), fragColor, visibility);
+}