56 lines
2 KiB
GLSL
56 lines
2 KiB
GLSL
#version 410
|
|
#define PI 3.14159265359
|
|
#define SCENE_EXTENT 100.0f
|
|
|
|
uniform mat4 matrModel;
|
|
uniform mat4 matrVisu;
|
|
uniform mat4 matrProj;
|
|
|
|
uniform sampler2D terrain;
|
|
uniform sampler2D waterPos;
|
|
uniform sampler2D waterHeight;
|
|
|
|
out vec4 Color;
|
|
|
|
in Attribs {
|
|
vec3 pos;
|
|
vec2 texuv;
|
|
} In;
|
|
|
|
void main(void)
|
|
{
|
|
// the derivative of the water displacement texture gives us the water surface normal
|
|
/*TODO Linear sampler */
|
|
vec3 pos = texture(waterPos, In.texuv).rgb + texture(waterHeight, In.texuv).rgb;
|
|
vec3 N = cross(dFdx(pos), -dFdy(pos));
|
|
if (dot(N, N) <= 0.0)
|
|
N = vec3(0, -1, 0);
|
|
else
|
|
N = normalize(N);
|
|
vec3 V = normalize(matrVisu * matrModel * vec4(In.pos, 1.0)).xyz; /* TODO check view vector */
|
|
vec3 R = V - (2 * dot(V, N))*N; /* Reflection */
|
|
/* Diffuse + reflective lighting */
|
|
vec3 color = vec3(0.5, 0.6, 0.8);
|
|
float fac = 1.0 - (1.0 - abs(N.y) + abs(R.y)) * (1.0 - abs(N.y) + abs(R.y));
|
|
Color.rgb = fac * fac * color;
|
|
/* Add specular glares */
|
|
vec3 glareDir1 = normalize(vec3(-1, -0.75, 1));
|
|
vec3 glareDir2 = normalize(vec3( 1, -0.75, -1));
|
|
vec3 glareDir3 = normalize(vec3( 1, -0.75, 1));
|
|
vec3 glareDir4 = normalize(vec3(-1, -0.75, -1));
|
|
vec3 glareDir5 = normalize(vec3( 0, -1, 0));
|
|
Color.rgb += 100*pow(max(dot(-R, glareDir5), max(dot(-R, glareDir4), max(dot(-R, glareDir3), max(dot(-R, glareDir2), max(dot(-R, glareDir1), 0.0))))), 5000);
|
|
/* Grid overlay */
|
|
float floorFactor = 1.0;
|
|
float sth = 0.06;
|
|
float posfac = 1.2 * 80.0 / SCENE_EXTENT;
|
|
if (fract(posfac * pos.x) < sth)
|
|
floorFactor = 0.5 - 0.5 * cos(-PI + 2.0 * PI * fract(posfac * pos.x) / sth);
|
|
if (fract(posfac * pos.z) < sth)
|
|
floorFactor = min(floorFactor, 0.5 - 0.5 * cos(-PI + 2.0 * PI * fract(posfac * pos.z) / sth));
|
|
Color.rgb *= (0.75 + 0.25 * floorFactor);
|
|
/* TODO Linear sampling */
|
|
float waterDepth = 1.0 + 0.9 * pow(texture(terrain, In.pos.xz / SCENE_EXTENT + vec2(0.5)).z, 4);
|
|
Color.rgb *= waterDepth;
|
|
Color.a = 1.0;
|
|
}
|