EEVEE-Next: Fix Vector render pass

source/blender/draw/engines/eevee_next/eevee_film.cc

@@ -183,20 +183,17 @@ void Film::init(const int2 &extent, const rcti *output_rect)
          * Using the render pass ensure we store the center depth. */
         render_passes |= EEVEE_RENDER_PASS_Z;
       }
-      /* TEST */
-      render_passes |= EEVEE_RENDER_PASS_VECTOR;
     }
     else {
       /* Render Case. */
       render_passes = eViewLayerEEVEEPassType(inst_.view_layer->eevee.render_passes);
 
-      render_passes |= EEVEE_RENDER_PASS_COMBINED;
-
 #define ENABLE_FROM_LEGACY(name_legacy, name_eevee) \
   SET_FLAG_FROM_TEST(render_passes, \
                      (inst_.view_layer->passflag & SCE_PASS_##name_legacy) != 0, \
                      EEVEE_RENDER_PASS_##name_eevee);
 
+      ENABLE_FROM_LEGACY(COMBINED, COMBINED)
       ENABLE_FROM_LEGACY(Z, Z)
       ENABLE_FROM_LEGACY(MIST, MIST)
       ENABLE_FROM_LEGACY(NORMAL, NORMAL)
@@ -209,6 +206,7 @@ void Film::init(const int2 &extent, const rcti *output_rect)
       ENABLE_FROM_LEGACY(DIFFUSE_DIRECT, DIFFUSE_LIGHT)
       ENABLE_FROM_LEGACY(GLOSSY_DIRECT, SPECULAR_LIGHT)
       ENABLE_FROM_LEGACY(ENVIRONMENT, ENVIRONMENT)
+      ENABLE_FROM_LEGACY(VECTOR, VECTOR)
 
 #undef ENABLE_FROM_LEGACY
     }
@@ -458,6 +456,10 @@ float2 Film::pixel_jitter_get() const
 
 eViewLayerEEVEEPassType Film::enabled_passes_get() const
 {
+  if (inst_.is_viewport() && data_.use_reprojection) {
+    /* Enable motion vector rendering but not the accumulation buffer. */
+    return enabled_passes_ | EEVEE_RENDER_PASS_VECTOR;
+  }
   return enabled_passes_;
 }
 

source/blender/draw/engines/eevee_next/eevee_instance.cc

@@ -60,6 +60,7 @@ void Instance::init(const int2 &output_res,
   sampling.init(scene);
   camera.init();
   film.init(output_res, output_rect);
+  velocity.init();
   main_view.init();
 }
 
@@ -240,7 +241,6 @@ void Instance::render_frame(RenderLayer *render_layer, const char *view_name)
     if (rp) {
       float *result = film.read_pass(pass_type);
       if (result) {
-        std::cout << "read " << pass_name << std::endl;
         BLI_mutex_lock(&render->update_render_passes_mutex);
         /* WORKAROUND: We use texture read to avoid using a framebuffer to get the render result.
          * However, on some implementation, we need a buffer with a few extra bytes for the read to

source/blender/draw/engines/eevee_next/eevee_velocity.cc

@@ -32,13 +32,17 @@ namespace blender::eevee {
 
 void VelocityModule::init()
 {
-  if (inst_.render && (inst_.film.enabled_passes_get() & EEVEE_RENDER_PASS_VECTOR)) {
-    /* No motion blur and the vector pass was requested. Do the step sync here. */
+  if (inst_.render && (inst_.film.enabled_passes_get() & EEVEE_RENDER_PASS_VECTOR) != 0 &&
+      true /* TODO(fclem) Motion blur */) {
+    /* No motion blur and the vector pass was requested. Do the steps sync here. */
     const Scene *scene = inst_.scene;
     float initial_time = scene->r.cfra + scene->r.subframe;
     step_sync(STEP_PREVIOUS, initial_time - 1.0f);
     step_sync(STEP_NEXT, initial_time + 1.0f);
+
     inst_.set_time(initial_time);
+    step_ = STEP_CURRENT;
+    /* Let the main sync loop handle the current step. */
   }
 }
 

source/blender/draw/engines/eevee_next/shaders/eevee_film_lib.glsl

@@ -636,6 +636,8 @@ void film_process_data(ivec2 texel_film, out vec4 out_color, out float out_depth
       vec4 normal = texelFetch(normal_tx, film_sample.texel, 0);
       float depth = texelFetch(depth_tx, film_sample.texel, 0).x;
       vec4 vector = velocity_resolve(vector_tx, film_sample.texel, depth);
+      /* Transform to pixel space. */
+      vector *= vec4(film_buf.render_extent, -film_buf.render_extent);
 
       film_store_depth(texel_film, depth, out_depth);
       film_store_data(texel_film, film_buf.normal_id, normal, out_color);

source/blender/draw/engines/eevee_next/shaders/eevee_velocity_lib.glsl

@@ -56,6 +56,7 @@ vec4 velocity_background(vec3 vV)
 /**
  * Load and resolve correct velocity as some pixels might still not have correct
  * motion data for performance reasons.
+ * Returns motion vector in render UV space.
  */
 vec4 velocity_resolve(sampler2D vector_tx, ivec2 texel, float depth)
 {

source/blender/makesdna/DNA_layer_types.h

@@ -37,7 +37,7 @@ typedef enum eViewLayerEEVEEPassType {
   EEVEE_RENDER_PASS_CRYPTOMATTE = (1 << 16),
   EEVEE_RENDER_PASS_VECTOR = (1 << 17),
 } eViewLayerEEVEEPassType;
-#define EEVEE_RENDER_PASS_MAX_BIT 17
+#define EEVEE_RENDER_PASS_MAX_BIT 18
 
 /* #ViewLayerAOV.type */
 typedef enum eViewLayerAOVType {