stk-code_catmod/data/shaders/displace.frag
Vincent Lejeune 62bf54b8f3 Simplify displace handling
Should be faster now
2014-07-14 18:54:40 +02:00

65 lines
1.5 KiB
GLSL

uniform sampler2D displacement_tex;
uniform sampler2D mask_tex;
uniform sampler2D color_tex;
uniform sampler2D tex;
uniform vec2 dir;
uniform vec2 dir2;
layout (std140) uniform MatrixesData
{
mat4 ViewMatrix;
mat4 ProjectionMatrix;
mat4 InverseViewMatrix;
mat4 InverseProjectionMatrix;
mat4 ShadowViewProjMatrixes[4];
vec2 screen;
};
#if __VERSION__ >= 130
in vec2 uv;
in vec2 uv_bis;
in float camdist;
out vec4 FragColor;
#else
varying vec2 uv;
varying vec2 uv_bis;
varying float camdist;
#define FragColor gl_FragColor
#endif
const float maxlen = 0.02;
void main()
{
float horiz = texture(displacement_tex, uv + dir).x;
float vert = texture(displacement_tex, (uv.yx + dir2) * vec2(0.9)).x;
vec2 offset = vec2(horiz, vert);
offset *= 2.0;
offset -= 1.0;
// Fade according to distance to cam
float fade = 1.0 - smoothstep(1.0, 100.0, camdist);
vec4 shiftval;
shiftval.r = step(offset.x, 0.0) * -offset.x;
shiftval.g = step(0.0, offset.x) * offset.x;
shiftval.b = step(offset.y, 0.0) * -offset.y;
shiftval.a = step(0.0, offset.y) * offset.y;
vec2 shift;
shift.x = -shiftval.x + shiftval.y;
shift.y = -shiftval.z + shiftval.w;
shift /= 50.;
vec2 tc = gl_FragCoord.xy / screen;
float mask = texture(mask_tex, tc + shift).x;
tc += (mask < 1.) ? vec2(0.) : shift;
vec4 col = texture(color_tex, tc);
vec4 blend_tex = texture(tex, uv);
col.rgb = blend_tex.rgb * blend_tex.a + (1. - blend_tex.a) * col.rgb;
FragColor = vec4(col.rgb, 1.);
}