Correct portrait rotation offsets

Author: ns6089

src_assets/windows/assets/shaders/directx/convert_yuv420_packed_uv_type0_vs.hlsl

@@ -11,5 +11,5 @@ cbuffer rotate_texture_steps_cbuffer : register(b1) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    return generate_fullscreen_triangle_vertex(vertex_id, subsample_offset.x, rotate_texture_steps);
+    return generate_fullscreen_triangle_vertex(vertex_id, subsample_offset, rotate_texture_steps);
 }

src_assets/windows/assets/shaders/directx/convert_yuv420_packed_uv_type0s_vs.hlsl

@@ -11,5 +11,5 @@ cbuffer rotate_texture_steps_cbuffer : register(b1) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    return generate_fullscreen_triangle_vertex(vertex_id, subsample_offset / 2, rotate_texture_steps);
+    return generate_fullscreen_triangle_vertex(vertex_id, subsample_offset, rotate_texture_steps);
 }

src_assets/windows/assets/shaders/directx/convert_yuv420_planar_y_vs.hlsl

@@ -6,5 +6,5 @@ cbuffer rotate_texture_steps_cbuffer : register(b1) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    return generate_fullscreen_triangle_vertex(vertex_id, rotate_texture_steps);
+    return generate_fullscreen_triangle_vertex(vertex_id, float2(0, 0), rotate_texture_steps);
 }

src_assets/windows/assets/shaders/directx/convert_yuv444_packed_vs.hlsl

@@ -6,5 +6,5 @@ cbuffer rotate_texture_steps_cbuffer : register(b1) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    return generate_fullscreen_triangle_vertex(vertex_id, rotate_texture_steps);
+    return generate_fullscreen_triangle_vertex(vertex_id, float2(0, 0), rotate_texture_steps);
 }

src_assets/windows/assets/shaders/directx/convert_yuv444_planar_vs.hlsl

@@ -15,7 +15,7 @@ cbuffer color_matrix_cbuffer : register(b3) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    vertex_t output = generate_fullscreen_triangle_vertex(vertex_id % 3, rotate_texture_steps);
+    vertex_t output = generate_fullscreen_triangle_vertex(vertex_id % 3, float2(0, 0), rotate_texture_steps);
 
     output.viewport = vertex_id / 3;
 

src_assets/windows/assets/shaders/directx/cursor_vs.hlsl

@@ -6,5 +6,5 @@ cbuffer rotate_texture_steps_cbuffer : register(b2) {
 
 vertex_t main_vs(uint vertex_id : SV_VertexID)
 {
-    return generate_fullscreen_triangle_vertex(vertex_id, rotate_texture_steps);
+    return generate_fullscreen_triangle_vertex(vertex_id, float2(0, 0), rotate_texture_steps);
 }

src_assets/windows/assets/shaders/directx/include/base_vs.hlsl

@@ -1,14 +1,6 @@
 #include "include/base_vs_types.hlsl"
 
-#if defined(LEFT_SUBSAMPLING)
-vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, float subsample_offset, int rotate_texture_steps)
-#elif defined(LEFT_SUBSAMPLING_SCALE)
-vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, float2 halfsample_offset, int rotate_texture_steps)
-#elif defined(TOPLEFT_SUBSAMPLING)
 vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, float2 subsample_offset, int rotate_texture_steps)
-#else
-vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, int rotate_texture_steps)
-#endif
 {
     vertex_t output;
     float2 tex_coord;
@@ -32,11 +24,16 @@ vertex_t generate_fullscreen_triangle_vertex(uint vertex_id, int rotate_texture_
                                      sin(rotation_radians), cos(rotation_radians) };
         float2 rotation_center = { 0.5, 0.5 };
         tex_coord = round(rotation_center + mul(rotation_matrix, tex_coord - rotation_center));
+
+        if (rotate_texture_steps % 2) {
+            subsample_offset.xy = subsample_offset.yx;
+        }
     }
 
 #if defined(LEFT_SUBSAMPLING)
-    output.tex_right_left_center = float3(tex_coord.x, tex_coord.x - subsample_offset, tex_coord.y);
+    output.tex_right_left_center = float3(tex_coord.x, tex_coord.x - subsample_offset.x, tex_coord.y);
 #elif defined(LEFT_SUBSAMPLING_SCALE)
+    float2 halfsample_offset = subsample_offset / 2;
     float3 right_center_left = float3(tex_coord.x + halfsample_offset.x,
                                       tex_coord.x - halfsample_offset.x,
                                       tex_coord.x - 3 * halfsample_offset.x);