magical new dots

.gitignore

@@ -1,3 +1,4 @@
 # assets
 *.blend1
 tools/remedy-session.rdbg
+src/imgui.ini

src/game/Level.cpp

@@ -32,7 +32,8 @@ namespace Game
         float TimeValues[4]{0.0f};
         TimeValues[0] = GetInstance().Time.Now;
         bgfx::setTexture(0, currentMaterial.Textures[0].SamplerHandle, currentMaterial.Textures[0].Handle);
-        bgfx::setTexture(1, rendering.DitherTextures.Sampler, rendering.DitherTextures.FinalTex);
+        bgfx::setTexture(1, rendering.DitherTextures.DitherSampler, rendering.DitherTextures.FinalTex);
+        bgfx::setTexture(2, rendering.DitherTextures.RampSampler, rendering.DitherTextures.RampTex);
         bgfx::setUniform(currentMaterial.Uniforms[Material::UTime], TimeValues);
         bgfx::setUniform(currentMaterial.Uniforms[Material::UDotColor], TestColor);
 

src/game/rendering/Rendering.cpp

@@ -193,16 +193,17 @@ namespace Game
             return handle;
         }
 
-        void DitherGen(DitherData& data)
+        void DitherGen(DitherData& data, int32_t recursion)
         {
-            constexpr int32_t MaxRecursion = 1;
             data.Points[0] = {0.0f, 0.0f};
             data.Points[1] = {0.5f, 0.5f};
             data.Points[2] = {0.5f, 0.0f};
             data.Points[3] = {0.0f, 0.5f};
             data.PointCount = 4;
+            for (int32_t i = 0; i < data.BrightnessBucketCount; ++i)
+                data.BrightnessBuckets[i] = 0;
 
-            for (int32_t recursionLevel = 0; recursionLevel < MaxRecursion; ++recursionLevel)
+            for (int32_t recursionLevel = 0; recursionLevel < recursion; ++recursionLevel)
             {
                 int32_t startCount = data.PointCount;
                 float offset = bx::pow(0.5f, recursionLevel + 1);
@@ -216,7 +217,7 @@ namespace Game
                 }
             }
 
-            uint64_t dotsPerSide = bx::round(bx::pow(2, MaxRecursion));
+            uint64_t dotsPerSide = bx::round(bx::pow(2, recursion));
             data.DitherTexDepth = dotsPerSide * dotsPerSide;
             data.DitherTexWH = 16 * dotsPerSide;
             uint64_t texPixelCount = data.DitherTexWH * data.DitherTexWH * data.DitherTexDepth;
@@ -257,12 +258,20 @@ namespace Game
                         int32_t bucket = bx::clamp(uint32_t(val * DitherData::BrightnessBucketCount),
                                                    0,
                                                    DitherData::BrightnessBucketCount - 1);
+                        data.BrightnessBuckets[bucket] += 1;
                     }
                 }
             }
 
-            // TODO: brightness ramp
+            // Brightness ramp
+            int32_t sum = 0;
+            for (int32_t i = 0; i < data.BrightnessBucketCount; ++i)
+            {
+                sum += data.BrightnessBuckets[data.BrightnessBucketCount - 1 - i];
+                data.BrightnessRamp[i + 1] = sum / (float)texPixelCount;
+            }
 
+            // Upload textures
             if (isValid(data.PreviewTex))
             {
                 bgfx::destroy(data.PreviewTex);
@@ -273,8 +282,14 @@ namespace Game
                 bgfx::destroy(data.FinalTex);
                 data.FinalTex = BGFX_INVALID_HANDLE;
             }
+            if (isValid(data.RampTex))
+            {
+                bgfx::destroy(data.RampTex);
+                data.RampTex = BGFX_INVALID_HANDLE;
+            }
             const bgfx::Memory* memPreview = bgfx::makeRef(data.DitherTex, texPixelCount * sizeof(Vec4));
             const bgfx::Memory* memFinal = bgfx::makeRef(data.DitherTex, texPixelCount * sizeof(Vec4));
+            const bgfx::Memory* memRamp = bgfx::makeRef(data.BrightnessRamp, sizeof(data.BrightnessRamp));
             data.PreviewTex = bgfx::createTexture2D(data.DitherTexWH,
                                                     data.DitherTexWH * data.DitherTexDepth,
                                                     false,
@@ -289,10 +304,16 @@ namespace Game
                                                   bgfx::TextureFormat::RGBA32F,
                                                   0,
                                                   memFinal);
+            data.RampTex = bgfx::createTexture2D(
+                BX_COUNTOF(data.BrightnessRamp), 1, false, 1, bgfx::TextureFormat::R32F, 0, memRamp);
 
-            if (!isValid(data.Sampler))
+            if (!isValid(data.DitherSampler))
             {
-                data.Sampler = bgfx::createUniform("s_ditherSampler", bgfx::UniformType::Sampler);
+                data.DitherSampler = bgfx::createUniform("s_ditherSampler", bgfx::UniformType::Sampler);
+            }
+            if (!isValid(data.RampSampler))
+            {
+                data.RampSampler = bgfx::createUniform("s_rampSampler", bgfx::UniformType::Sampler);
             }
         }
 
@@ -378,7 +399,7 @@ namespace Game
         {
             ImGui::LoadIniSettingsFromDisk("imgui.ini");
         }
-        DitherGen(DitherTextures);
+        DitherGen(DitherTextures, DitherRecursion);
     }
 
     void GameRendering::Update()
@@ -460,8 +481,10 @@ namespace Game
                 }
                 if (ImGui::Button("Dithergen"))
                 {
-                    DitherGen(DitherTextures);
+                    DitherGen(DitherTextures, DitherRecursion);
                 }
+                ImGui::SameLine();
+                ImGui::SliderInt("Recursion", &DitherRecursion, 1, 4);
                 ImGui::Text(
                     "%ux%ux%u", DitherTextures.DitherTexWH, DitherTextures.DitherTexWH, DitherTextures.DitherTexDepth);
                 if (!isValid(DitherTextures.PreviewTex))
@@ -474,10 +497,9 @@ namespace Game
                                  {(float)DitherTextures.DitherTexWH,
                                   (float)DitherTextures.DitherTexWH * DitherTextures.DitherTexDepth});
                 }
-                ImGui::Text("Brightness Buckets (TODO)");
+                if (isValid(DitherTextures.RampTex))
-                for (int32_t i = 0; i < DitherTextures.BrightnessBucketCount; ++i)
                 {
-                    ImGui::Text("%u", DitherTextures.BrightnessBuckets[i]);
+                    ImGui::Image(DitherTextures.RampTex.idx, {BX_COUNTOF(DitherTextures.BrightnessRamp), 1});
                 }
             }
             ImGui::End();

src/game/rendering/Rendering.h

@@ -74,9 +74,13 @@ namespace Game
         uint32_t DitherTexWH = 0;
         uint32_t DitherTexDepth = 0;
         int32_t BrightnessBuckets[BrightnessBucketCount];
+        float BrightnessRamp[BrightnessBucketCount + 1];
         bgfx::TextureHandle PreviewTex = BGFX_INVALID_HANDLE;
         bgfx::TextureHandle FinalTex = BGFX_INVALID_HANDLE;
-        bgfx::UniformHandle Sampler = BGFX_INVALID_HANDLE;
+        bgfx::TextureHandle RampTex = BGFX_INVALID_HANDLE;
+
+        bgfx::UniformHandle DitherSampler = BGFX_INVALID_HANDLE;
+        bgfx::UniformHandle RampSampler = BGFX_INVALID_HANDLE;
         ImTextureID PreviewID = 0;
     };
 
@@ -101,6 +105,7 @@ namespace Game
         uint32_t ResetFlags = BGFX_RESET_VSYNC;
         uint16_t MainViewID = 10;
         float LastShaderLoadTime = 0.0f;
+        int32_t DitherRecursion = 1;
 
       public:
         void Setup();

src/game/shaders/frag.sc

@@ -7,6 +7,7 @@ $input v_wpos
 
 SAMPLER2D(s_texColor, 0);
 SAMPLER3D(s_ditherSampler, 1);
+SAMPLER2D(s_rampSampler, 2);
 uniform vec4 u_time;
 uniform vec4 u_testColor;
 
@@ -29,19 +30,35 @@ vec3 desaturate(vec3 color)
 
 void main()
 {
+	// setup
+	float globalScale = 6.0;
 	float testRadius = 30.0;
 	float testSpeed = 1.0;
 	vec3 testOffset = vec3(0.0, 0.0, 50.0);
 	float3 lightPos = vec3(sin(u_time.x * testSpeed) * testRadius, 5.0, cos(u_time.x * testSpeed) * testRadius);
+	vec2 inputUv = v_uv0;
+	vec3 texColor = u_testColor.x > 0.1 ? u_testColor.xyz : texture2D(s_texColor, v_uv0).xyz;
+
+	// lighting
 	// float brightness = calcBrightness(lightPos, v_wpos, v_normal);
-	float brightness = calcBrightnessDirectional(vec3(0.5, 0.3, 1.0), v_normal);
+	float brightness = lerp(0.5, 0.9, calcBrightnessDirectional(vec3(0.5, 0.3, 1.0), v_normal));
-	brightness = 1.0;
+	// float brightness = 0.5;
-	// brightness = sin(u_time.x) * 0.5 + 0.5;
+	// brightness = lerp(0.2, 1.0, sin(u_time.x) * 0.5 + 0.5);
+	
+	// constants
+	float dotsPerSide = 2;
+	float dotsTotal = dotsPerSide * dotsPerSide;
+	float xRes = 32;
+	float invXRes = 1 / xRes;
+	float zRes = dotsTotal;
+	float invZRes = 1 / zRes;
+	
+	float2 rampLookupUv = vec2((0.5 * invXRes + (1 - invXRes) * brightness), 0.5);
+	float brightnessCurve = texture2D(s_rampSampler, rampLookupUv).r;
 	
 	// Magic dot frequency calculation
-	float baseScale = 8.0;
+	float2 dx = ddx(inputUv);
-	float2 dx = ddx(v_uv0 * baseScale);
+	float2 dy = ddy(inputUv);
-	float2 dy = ddy(v_uv0 * baseScale);
 	float2x2 mat = float2x2(dx, dy);
 	float4 vectorized = float4(dx, dy);
 	float qq = dot(vectorized, vectorized);
@@ -51,23 +68,34 @@ void main()
 	float2 freq = sqrt(float2(qq + discriminant, qq - discriminant) / 2.0);
 
 	// Figuring out how many dots we want
-	float spacing = freq.y * exp2(2.0);
+	float scaleExp = exp2(globalScale);
-	spacing = 1.0 / spacing;
+	float spacing = freq.y * scaleExp;
-	spacing *= brightness; // TODO: check reference to see how to calculate this!
+
-	float spacingLog = max(log2(spacing), 0.0);
+	float brightnessSpacingMultiplier = pow(brightnessCurve * 2 + 0.001, -(1 - 0.5));
+	// float brightnessSpacingMultiplier = 1;
+	spacing *= brightnessSpacingMultiplier;
+	
+	float spacingLog = log2(spacing);
 	int patternScaleLevel = floor(spacingLog);
 	float patternFractional = spacingLog - patternScaleLevel;
-	vec2 uv = v_uv0 * exp2(patternScaleLevel);
+	vec2 uv = inputUv / exp2(patternScaleLevel);
 	
-	float dotsTotal = 4;
+	// patternFractional *= patternFractional;
-	float subLayer = lerp(0.25 * dotsTotal, dotsTotal, patternFractional);
+	// patternFractional = smoothstep(0, 1, patternFractional);
-	subLayer = (subLayer - 0.5) / dotsTotal;
+	float subLayer = lerp(0.25 * dotsTotal, dotsTotal, 1 - patternFractional);
+	subLayer = (subLayer - 0.5) * invZRes;
 	
-	vec4 circleSample = texture3D(s_ditherSampler, vec3(uv, subLayer));	
+	float pattern = texture3D(s_ditherSampler, vec3(uv, subLayer)).r;	
-	float circleVal = circleSample.x < 0.75 ? 0.1 : 0.9;
 	
-	// Coloring
+	float contrast = 12 * scaleExp * brightnessSpacingMultiplier * 0.1;
-	vec3 texColor = u_testColor.x > 0.1 ? u_testColor.xyz : texture2D(s_texColor, v_uv0).xyz;
+	contrast *= pow(freq.y / freq.x, 1.0);
-	vec3 finalColor = texColor * vec3(circleVal, circleVal, circleVal);
+	float baseVal = lerp(0.5, brightness, saturate(1.05 / (1 + contrast)));
+	float threshold = 1 - brightnessCurve + 0.6;
+	
+	vec3 thresholds = threshold.xxx / texColor;
+	// vec3 finalColor = saturate((pattern - thresholds) * contrast + baseVal);
+	vec3 finalColor = saturate((pattern - thresholds) * contrast + baseVal);
 	gl_FragColor = vec4(finalColor, 1.0);
+	// gl_FragColor = vec4(finalColor * 0.8 + subLayer * 0.2, 1.0);
+	// gl_FragColor = vec4(finalColor * 0.8 + vec3(uv % 1, 0.0) * 0.2, 1.0);
 }

src/imgui.ini

@@ -1,21 +0,0 @@
-[Window][WindowOverViewport_11111111]
-Pos=0,0
-Size=1920,1080
-Collapsed=0
-
-[Window][Rendering]
-Pos=1595,0
-Size=325,1080
-Collapsed=0
-DockId=0x00000002,0
-
-[Window][Debug##Default]
-Pos=60,60
-Size=400,400
-Collapsed=0
-
-[Docking][Data]
-DockSpace   ID=0x08BD597D Window=0x1BBC0F80 Pos=0,0 Size=1920,1080 Split=X
-  DockNode  ID=0x00000001 Parent=0x08BD597D SizeRef=1593,1009 CentralNode=1
-  DockNode  ID=0x00000002 Parent=0x08BD597D SizeRef=325,1009 Selected=0xCEB1220F
-