Merge pull request #277 from smoogipoo/masking-ssbo

Adjust shader to support masking SSBO

osu.Game.Resources/Shaders/sh_CursorTrail.vs

@@ -1,14 +1,19 @@
+#include "Internal/sh_MaskingInfo.h"
+
 layout(location = 0) in vec2 m_Position;
 layout(location = 1) in vec4 m_Colour;
 layout(location = 2) in vec2 m_TexCoord;
 layout(location = 3) in vec4 m_TexRect;
 layout(location = 4) in float m_Time;
+layout(location = 5) in int m_MaskingIndex;
 
 layout(location = 0) out vec2 v_MaskingPosition;
 layout(location = 1) out vec4 v_Colour;
 layout(location = 2) out vec2 v_TexCoord;
 layout(location = 3) out vec4 v_TexRect;
 layout(location = 4) out vec2 v_BlendRange;
+layout(location = 5) flat out int v_MaskingIndex;
+layout(location = 6) out highp vec2 v_ScissorPosition;
 
 layout(std140, set = 1, binding = 0) uniform m_CursorTrailParameters
 {
@@ -18,15 +23,21 @@ layout(std140, set = 1, binding = 0) uniform m_CursorTrailParameters
 
 void main(void)
 {
+    InitMasking(m_MaskingIndex);
+
     // Transform to position to masking space.
-    vec3 maskingPos = g_ToMaskingSpace * vec3(m_Position, 1.0);
+    highp vec4 maskingPos = g_MaskingInfo.ToMaskingSpace * vec4(m_Position.xy, 1.0, 1.0);
     v_MaskingPosition = maskingPos.xy / maskingPos.z;
 
+    highp vec4 scissorPos = g_MaskingInfo.ToScissorSpace * vec4(m_Position.xy, 1.0, 1.0);
+    v_ScissorPosition = scissorPos.xy / scissorPos.z;
+
     v_Colour = vec4(m_Colour.rgb, m_Colour.a * pow(clamp(m_Time - g_FadeClock, 0.0, 1.0), g_FadeExponent));
 
     v_TexCoord = m_TexCoord;
     v_TexRect = m_TexRect;
     v_BlendRange = vec2(0.0);
+    v_MaskingIndex = m_MaskingIndex;
 
     gl_Position = g_ProjMatrix * vec4(m_Position, 1.0, 1.0);
 }