Snow Cover and mouse picking fix

gl_engine/Window.cpp

@@ -57,6 +57,7 @@
 #include "nucleus/timing/TimerManager.h"
 #include "nucleus/timing/TimerInterface.h"
 #include "nucleus/timing/CpuTimer.h"
+#include "nucleus/utils/bit_coding.h"
 #if (defined(__linux) && !defined(__ANDROID__)) || defined(_WIN32) || defined(_WIN64)
 #include "GpuAsyncQueryTimer.h"
 #endif
@@ -120,7 +121,7 @@ void Window::initialise_gpu()
                                                   TextureDefinition{ Framebuffer::ColourFormat::RGB8    },      // Albedo
                                                   TextureDefinition{ Framebuffer::ColourFormat::RGBA32F },      // Position WCS and distance (distance is optional, but i use it directly for a little speed improvement)
                                                   TextureDefinition{ Framebuffer::ColourFormat::RG16UI  },      // Octahedron Normals
-                                                  TextureDefinition{ Framebuffer::ColourFormat::R32UI   }       // Discretized Encoded Depth for readback IMPORTANT: IF YOU MOVE THIS YOU HAVE TO ADAPT THE GET DEPTH FUNCTION
+                                                  TextureDefinition{ Framebuffer::ColourFormat::RGBA8   }       // Discretized Encoded Depth for readback IMPORTANT: IF YOU MOVE THIS YOU HAVE TO ADAPT THE GET DEPTH FUNCTION
                                               });
 
     m_atmospherebuffer = std::make_unique<Framebuffer>(Framebuffer::DepthFormat::None, std::vector{ TextureDefinition{Framebuffer::ColourFormat::RGBA8} });
@@ -440,9 +441,8 @@ void Window::update_gpu_quads(const std::vector<nucleus::tile_scheduler::tile_ty
 
 float Window::depth(const glm::dvec2& normalised_device_coordinates)
 {
-    uint32_t fakeNormalizedDepth;
-    m_gbuffer->read_colour_attachment_pixel(3, normalised_device_coordinates, &fakeNormalizedDepth);
-    const auto depth = float(std::exp(double(fakeNormalizedDepth) / 4294967295.0 * 13.0));
+    const auto read_float = nucleus::utils::bit_coding::to_f16f16(m_gbuffer->read_colour_attachment_pixel(3, normalised_device_coordinates))[0];
+    const auto depth = std::exp(read_float * 13.f);
     return depth;
 }
 

gl_engine/shaders/encoder.glsl

@@ -25,14 +25,12 @@
 highp float fakeNormalizeWSDepth(highp float depth) {
     return log(depth) / 13.0;
 }
-highp float fakeUnNormalizeWSDepth(highp float ndepth) {
-    return exp(13.0 * ndepth);
-}
-highp uint depthWSEncode1u32(highp float depth) {
-    return uint(fakeNormalizeWSDepth(depth) * 4294967295.0);
-}
-highp float depthWSDecode1u32(highp uint depth32) {
-    return fakeUnNormalizeWSDepth(float(depth32) / 4294967295.0);
+lowp vec2 depthWSEncode2n8(highp float depth) {
+    highp float value = fakeNormalizeWSDepth(depth);
+    mediump uint scaled = uint(value * 65535.f + 0.5f);
+    mediump uint r = scaled >> 8u;
+    mediump uint b = scaled & 255u;
+    return vec2(float(r) / 255.f, float(b) / 255.f);
 }
 
 // ===== OCTAHEDRON MAPPING FOR NORMALS =====

gl_engine/shaders/snow.glsl

@@ -22,24 +22,24 @@
 #define ORIGIN_SHIFT 20037508.3427892430765884
 #define PI 3.1415926535897932384626433
 
-mediump float mod289(mediump float x)   {   return x - floor(x * (1.0 / 289.0)) * 289.0;    }
-mediump vec4 mod289(mediump vec4 x)     {   return x - floor(x * (1.0 / 289.0)) * 289.0;    }
-mediump vec4 perm(mediump vec4 x)       {   return mod289(((x * 34.0) + 1.0) * x);          }
+highp float mod289(highp float x)   {   return x - floor(x * (1.0 / 289.0)) * 289.0;    }
+highp vec4 mod289(highp vec4 x)     {   return x - floor(x * (1.0 / 289.0)) * 289.0;    }
+highp vec4 perm(highp vec4 x)       {   return mod289(((x * 34.0) + 1.0) * x);          }
 
-mediump float noise(mediump vec3 p){
-    mediump vec3 a = floor(p);
-    mediump vec3 d = p - a;
+highp float noise(highp vec3 p){
+    highp vec3 a = floor(p);
+    highp vec3 d = p - a;
     d = d * d * (3.0 - 2.0 * d);
-    mediump vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
-    mediump vec4 k1 = perm(b.xyxy);
-    mediump vec4 k2 = perm(k1.xyxy + b.zzww);
-    mediump vec4 c = k2 + a.zzzz;
-    mediump vec4 k3 = perm(c);
-    mediump vec4 k4 = perm(c + 1.0);
-    mediump vec4 o1 = fract(k3 * (1.0 / 41.0));
-    mediump vec4 o2 = fract(k4 * (1.0 / 41.0));
-    mediump vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
-    mediump vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
+    highp vec4 b = a.xxyy + vec4(0.0, 1.0, 0.0, 1.0);
+    highp vec4 k1 = perm(b.xyxy);
+    highp vec4 k2 = perm(k1.xyxy + b.zzww);
+    highp vec4 c = k2 + a.zzzz;
+    highp vec4 k3 = perm(c);
+    highp vec4 k4 = perm(c + 1.0);
+    highp vec4 o1 = fract(k3 * (1.0 / 41.0));
+    highp vec4 o2 = fract(k4 * (1.0 / 41.0));
+    highp vec4 o3 = o2 * d.z + o1 * (1.0 - d.z);
+    highp vec2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
     return o4.y * d.y + o4.x * (1.0 - d.y);
 }
 

gl_engine/shaders/tile.frag

@@ -26,7 +26,7 @@ uniform sampler2D texture_sampler;
 layout (location = 0) out lowp vec3 texout_albedo;
 layout (location = 1) out highp vec4 texout_position;
 layout (location = 2) out highp uvec2 texout_normal;
-layout (location = 3) out highp uint texout_depth;
+layout (location = 3) out lowp vec4 texout_depth;
 
 in highp vec2 uv;
 in highp vec3 var_pos_cws;
@@ -69,7 +69,7 @@ void main() {
     texout_normal = octNormalEncode2u16(normal);
 
     // Write and encode distance for readback
-    texout_depth = depthWSEncode1u32(dist);
+    texout_depth = vec4(depthWSEncode2n8(dist), 0.0, 0.0);
 
     // HANDLE OVERLAYS (and mix it with the albedo color) THAT CAN JUST BE DONE IN THIS STAGE
     // (because of DATA thats not forwarded)