62 lines
1.9 KiB
GLSL
62 lines
1.9 KiB
GLSL
#version 310 es
|
|
#extension GL_EXT_tessellation_shader : require
|
|
layout(quads, cw, fractional_even_spacing) in;
|
|
|
|
layout(binding = 1, std140) uniform UBO
|
|
{
|
|
mat4 uMVP;
|
|
vec4 uScale;
|
|
vec2 uInvScale;
|
|
vec3 uCamPos;
|
|
vec2 uPatchSize;
|
|
vec2 uInvHeightmapSize;
|
|
} _31;
|
|
|
|
layout(binding = 0) uniform mediump sampler2D uHeightmapDisplacement;
|
|
|
|
layout(location = 0) patch in vec2 vOutPatchPosBase;
|
|
layout(location = 1) patch in vec4 vPatchLods;
|
|
layout(location = 1) out vec4 vGradNormalTex;
|
|
layout(location = 0) out vec3 vWorld;
|
|
|
|
vec2 lerp_vertex(vec2 tess_coord)
|
|
{
|
|
return vOutPatchPosBase + (tess_coord * _31.uPatchSize);
|
|
}
|
|
|
|
mediump vec2 lod_factor(vec2 tess_coord)
|
|
{
|
|
mediump vec2 x = mix(vPatchLods.yx, vPatchLods.zw, vec2(tess_coord.x));
|
|
mediump float level = mix(x.x, x.y, tess_coord.y);
|
|
mediump float floor_level = floor(level);
|
|
mediump float fract_level = level - floor_level;
|
|
return vec2(floor_level, fract_level);
|
|
}
|
|
|
|
mediump vec3 sample_height_displacement(vec2 uv, vec2 off, mediump vec2 lod)
|
|
{
|
|
return mix(textureLod(uHeightmapDisplacement, uv + (off * 0.5), lod.x).xyz, textureLod(uHeightmapDisplacement, uv + (off * 1.0), lod.x + 1.0).xyz, vec3(lod.y));
|
|
}
|
|
|
|
void main()
|
|
{
|
|
vec2 tess_coord = gl_TessCoord.xy;
|
|
vec2 param = tess_coord;
|
|
vec2 pos = lerp_vertex(param);
|
|
vec2 param_1 = tess_coord;
|
|
mediump vec2 lod = lod_factor(param_1);
|
|
vec2 tex = pos * _31.uInvHeightmapSize;
|
|
pos *= _31.uScale.xy;
|
|
mediump float delta_mod = exp2(lod.x);
|
|
vec2 off = _31.uInvHeightmapSize * delta_mod;
|
|
vGradNormalTex = vec4(tex + (_31.uInvHeightmapSize * 0.5), tex * _31.uScale.zw);
|
|
vec2 param_2 = tex;
|
|
vec2 param_3 = off;
|
|
mediump vec2 param_4 = lod;
|
|
vec3 height_displacement = sample_height_displacement(param_2, param_3, param_4);
|
|
pos += height_displacement.yz;
|
|
vWorld = vec3(pos.x, height_displacement.x, pos.y);
|
|
gl_Position = _31.uMVP * vec4(vWorld, 1.0);
|
|
}
|
|
|