Implemented typical PSX style vertex jittering

neo/renderer/RenderBackend.cpp

@@ -5578,6 +5578,24 @@ void idRenderBackend::DrawViewInternal( const viewDef_t* _viewDef, const int ste
 		float projMatrixTranspose[16];
 		R_MatrixTranspose( viewDef->projectionMatrix, projMatrixTranspose );
 		SetVertexParms( RENDERPARM_PROJMATRIX_X, projMatrixTranspose, 4 );
+
+		// PSX jitter parms
+		if( !_viewDef->is2Dgui )
+		{
+			parm[0] = r_psxVertexJitter.GetFloat();
+			parm[1] = 0;
+			parm[2] = 0;
+			parm[3] = 0;
+		}
+		else
+		{
+			parm[0] = 0;
+			parm[1] = 0;
+			parm[2] = 0;
+			parm[3] = 0;
+		}
+
+		SetVertexParm( RENDERPARM_PSX_DISTORTIONS, parm );
 	}
 
 	//-------------------------------------------------

neo/renderer/RenderCommon.h

@@ -1276,6 +1276,8 @@ extern idCVar r_retroDitherScale;
 
 extern idCVar r_renderMode;
 extern idCVar image_pixelLook;
+
+extern idCVar r_psxVertexJitter;
 // RB end
 
 /*

neo/renderer/RenderProgs.h

@@ -151,6 +151,9 @@ enum renderParm_t
 	RENDERPARM_GLOBALLIGHTORIGIN,
 	RENDERPARM_JITTERTEXSCALE,
 	RENDERPARM_JITTERTEXOFFSET,
+
+	RENDERPARM_PSX_DISTORTIONS,
+
 	RENDERPARM_CASCADEDISTANCES,
 
 	RENDERPARM_SHADOW_MATRIX_0_X,	// rpShadowMatrices[6 * 4]

neo/renderer/RenderSystem_init.cpp

@@ -303,6 +303,8 @@ idCVar r_crtVignette( "r_crtVignette", "0.8", CVAR_RENDERER | CVAR_FLOAT | CVAR_
 idCVar r_retroDitherScale( "r_retroDitherScale", "0.3", CVAR_RENDERER | CVAR_FLOAT | CVAR_NEW, "" );
 
 idCVar r_renderMode( "r_renderMode", "0", CVAR_RENDERER | CVAR_ARCHIVE | CVAR_INTEGER | CVAR_NEW, "0 = Doom, 1 = Commodore 64, 2 = Commodore 64 Highres, 3 = Amstrad CPC 6128, 4 = Amstrad CPC 6128 Highres, 5 = Sega Genesis, 6 = Sega Genesis Highres, 7 = Sony PSX", 0, 7 );
+
+idCVar r_psxVertexJitter( "r_psxVertexJitter", "0.5", CVAR_RENDERER | CVAR_FLOAT | CVAR_NEW, "" );
 // RB end
 
 const char* fileExten[4] = { "tga", "png", "jpg", "exr" };

neo/shaders/builtin/color.vs.hlsl

@@ -101,4 +101,6 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 #endif
+
+	result.position.xyz = psxVertexJitter( result.position );
 }

neo/shaders/builtin/depth.vs.hlsl

@@ -94,9 +94,12 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 #else
+
 	result.position.x = dot4( vertex.position, rpMVPmatrixX );
 	result.position.y = dot4( vertex.position, rpMVPmatrixY );
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 #endif
+
+	result.position.xyz = psxVertexJitter( result.position );
 }

neo/shaders/builtin/fog/blendLight.vs.hlsl

@@ -120,4 +120,6 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.texcoord1.x = dot4( vertex.position, rpTexGen1S );
 	result.texcoord1.y = 0.5;
 #endif
+
+	result.position.xyz = psxVertexJitter( result.position );
 }

neo/shaders/builtin/fog/fog.vs.hlsl

@@ -116,4 +116,6 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.texcoord1.x = dot4( vertex.position, rpTexGen1S );
 	result.texcoord1.y = dot4( vertex.position, rpTexGen1T );
 #endif
+
+	result.position.xyz = psxVertexJitter( result.position );
 }

neo/shaders/builtin/gbuffer.vs.hlsl

@@ -130,6 +130,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	// textures 0 takes the base coordinates by the texture matrix
 	result.texcoord0.x = dot4( vertex.texcoord.xy, rpBumpMatrixS );
 	result.texcoord0.y = dot4( vertex.texcoord.xy, rpBumpMatrixT );

neo/shaders/builtin/legacy/bumpyenvironment.vs.hlsl

@@ -173,5 +173,7 @@ void main( VS_IN vertex, out VS_OUT result )
 
 #endif
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	result.color = rpColor;
 }

neo/shaders/builtin/legacy/environment.vs.hlsl

@@ -121,5 +121,7 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.texcoord1 = vNormal.xyz;
 #endif
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	result.color = sRGBAToLinearRGBA( rpColor );
 }

neo/shaders/builtin/legacy/skybox.vs.hlsl

@@ -54,6 +54,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	result.texcoord0 = vertex.position.xyz - rpLocalViewOrigin.xyz;
 
 	result.color = ( swizzleColor( vertex.color ) * rpVertexColorModulate ) + rpVertexColorAdd;

neo/shaders/builtin/lighting/ambient_lightgrid_IBL.vs.hlsl

@@ -135,6 +135,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 defaultTexCoord = float4( 0.0f, 0.5f, 0.0f, 1.0f );
 
 	//--------------------------------------------------------------

neo/shaders/builtin/lighting/ambient_lighting_IBL.vs.hlsl

@@ -135,6 +135,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 defaultTexCoord = float4( 0.0f, 0.5f, 0.0f, 1.0f );
 
 	//calculate vector to light

neo/shaders/builtin/lighting/interaction.vs.hlsl

@@ -133,6 +133,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 defaultTexCoord = float4( 0.0f, 0.5f, 0.0f, 1.0f );
 
 	//calculate vector to light

neo/shaders/builtin/lighting/interactionAmbient.vs.hlsl

@@ -132,6 +132,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 defaultTexCoord = float4( 0.0f, 0.5f, 0.0f, 1.0f );
 
 	//calculate vector to light

neo/shaders/builtin/lighting/interactionSM.vs.hlsl

@@ -136,6 +136,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
 	result.position.w = dot4( modelPosition, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 defaultTexCoord = float4( 0.0f, 0.5f, 0.0f, 1.0f );
 
 	//calculate vector to light

neo/shaders/builtin/texture.vs.hlsl

@@ -53,6 +53,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	// compute oldschool texgen or multiply by texture matrix
 	BRANCH if( rpTexGen0Enabled.x > 0.0 )
 	{

neo/shaders/builtin/texture_color.vs.hlsl

@@ -91,6 +91,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	modelPosition.z = dot4( matZ, vertex.position );
 	modelPosition.w = 1.0;
 
+	modelPosition.xyz = psxVertexJitter( modelPosition );
+
 	result.position.x = dot4( modelPosition, rpMVPmatrixX );
 	result.position.y = dot4( modelPosition, rpMVPmatrixY );
 	result.position.z = dot4( modelPosition, rpMVPmatrixZ );
@@ -114,6 +116,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	// Compute oldschool texgen or multiply by texture matrix
 	BRANCH if( rpTexGen0Enabled.x > 0.0 )
 	{

neo/shaders/builtin/texture_color_texgen.vs.hlsl

@@ -55,6 +55,8 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	float4 tc0;
 	tc0.x = dot4( vertex.position, rpTexGen0S );
 	tc0.y = dot4( vertex.position, rpTexGen0T );

neo/shaders/builtin/vertex_color.vs.hlsl

@@ -55,5 +55,7 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	result.color =  swizzleColor( vertex.color );
 }

neo/shaders/builtin/video/bink.vs.hlsl

@@ -53,5 +53,7 @@ void main( VS_IN vertex, out VS_OUT result )
 	result.position.z = dot4( vertex.position, rpMVPmatrixZ );
 	result.position.w = dot4( vertex.position, rpMVPmatrixW );
 
+	result.position.xyz = psxVertexJitter( result.position );
+
 	result.texcoord0 = vertex.texcoord;
 }

neo/shaders/global_inc.hlsl

@@ -107,6 +107,7 @@ cbuffer globals : register( b0 VK_DESCRIPTOR_SET( 0 ) )
 	float4 rpGlobalLightOrigin;
 	float4 rpJitterTexScale;
 	float4 rpJitterTexOffset;
+	float4 rpPSXDistortions;
 	float4 rpCascadeDistances;
 
 	float4 rpShadowMatrices[6 * 4];
@@ -491,6 +492,24 @@ static float2 vposToScreenPosTexCoord( float2 vpos )
 	return vpos.xy * rpWindowCoord.xy;
 }
 
+static float3 psxVertexJitter( float4 spos )
+{
+	float jitterScale = rpPSXDistortions.x;
+	if( jitterScale > 0.0 )
+	{
+		// snap to vertex to a pixel position on a lower grid
+		float3 vertex = spos.xyz / spos.w;
+		//float2 resolution = float2( 320, 240 ); // TODO 320x240 * jitterScale
+		float2 resolution = float2( 160, 120 );
+		vertex.xy = floor( resolution * vertex.xy ) / resolution;
+		vertex *= spos.w;
+
+		return vertex;
+	}
+
+	return spos.xyz;
+}
+
 #define BRANCH
 #define IFANY