some attempts to get visible velocity

Nelarius · Jul 3, 2024 · 83d8516 · 83d8516
1 parent ef90fb3
commit 83d8516
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Showing 4 changed files with 11 additions and 11 deletions.
diff --git a/src/pt/deferred_renderer.cpp b/src/pt/deferred_renderer.cpp
@@ -953,7 +953,7 @@ DeferredRenderer::GbufferPass::GbufferPass(
                 .nextInChain = nullptr,
                 .format = VELOCITY_TEXTURE_FORMAT,
                 .blend = &blendState,
-                .writeMask = WGPUColorWriteMask_All,
+                .writeMask = WGPUColorWriteMask_Red | WGPUColorWriteMask_Green,
             }};
 
         const WGPUFragmentState fragmentState{

diff --git a/src/pt/deferred_renderer_debug_pass.wgsl b/src/pt/deferred_renderer_debug_pass.wgsl
@@ -38,9 +38,8 @@ fn fsMain(in: VertexOutput) -> @location(0) vec4f {
         let a = 0.1;
         rgb = vec3((1.0 + a) * x / (x + vec3(a)));
     } else {
-        let uvVelocity = textureLoad(gbufferVelocity, idx, 0).rg;
-        let velocity = vec2(uvVelocity.x, 1.0 - uvVelocity.y);
-        rgb = vec3f(velocity, 0.0);
+        let velocity = textureLoad(gbufferVelocity, idx, 0).rg;
+        rgb = vec3f(vec2(0.5) + velocity, 0.0);
     }
     let srgb = pow(rgb, vec3(1.0 / 2.2));
     return vec4(srgb, 1.0);

diff --git a/src/pt/deferred_renderer_gbuffer_pass.wgsl b/src/pt/deferred_renderer_gbuffer_pass.wgsl
@@ -43,7 +43,8 @@ fn fsMain(in: VertexOutput) -> GbufferOutput {
     let encodedNormal = 0.5f * in.normal.xyz + vec3f(0.5f);
     let currentNdc = in.position.xy / in.position.w;
     let previousNdc = in.previousPosition.xy / in.previousPosition.w;
-    let ndcVelocity = previousNdc - currentNdc;    // From the current pixel to the previous one
-    let uvVelocity = ndcVelocity * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let currentUv = currentNdc * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let previousUv = previousNdc * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let uvVelocity = previousUv - currentUv;    // From the current pixel to the previous one
     return GbufferOutput(vec4(linearAlbedo, 1f), vec4(encodedNormal, 1f), uvVelocity);
 }
diff --git a/src/pt/shader_source.hpp b/src/pt/shader_source.hpp
@@ -668,8 +668,9 @@ fn fsMain(in: VertexOutput) -> GbufferOutput {
     let encodedNormal = 0.5f * in.normal.xyz + vec3f(0.5f);
     let currentNdc = in.position.xy / in.position.w;
     let previousNdc = in.previousPosition.xy / in.previousPosition.w;
-    let ndcVelocity = previousNdc - currentNdc;    // From the current pixel to the previous one
-    let uvVelocity = ndcVelocity * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let currentUv = currentNdc * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let previousUv = previousNdc * vec2f(0.5f, -0.5f) + vec2f(0.5f);
+    let uvVelocity = previousUv - currentUv;    // From the current pixel to the previous one
     return GbufferOutput(vec4(linearAlbedo, 1f), vec4(encodedNormal, 1f), uvVelocity);
 }
 )";
@@ -714,9 +715,8 @@ fn fsMain(in: VertexOutput) -> @location(0) vec4f {
         let a = 0.1;
         rgb = vec3((1.0 + a) * x / (x + vec3(a)));
     } else {
-        let uvVelocity = textureLoad(gbufferVelocity, idx, 0).rg;
-        let velocity = vec2(uvVelocity.x, 1.0 - uvVelocity.y);
-        rgb = vec3f(velocity, 0.0);
+        let velocity = textureLoad(gbufferVelocity, idx, 0).rg;
+        rgb = vec3f(vec2(0.5) + velocity, 0.0);
     }
     let srgb = pow(rgb, vec3(1.0 / 2.2));
     return vec4(srgb, 1.0);