Change cameraEffects shader to use screenSpace vertex shader

Also NUKE `u_ModelViewProjectionMatrix` and `u_TextureMatrix`, because they have no effect there.

Author: VReaperV

src.cmake

@@ -158,7 +158,6 @@ set(GLSLSOURCELIST
     ${ENGINE_DIR}/renderer/glsl_source/vertexSkinning_vp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/blur_fp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/cameraEffects_fp.glsl
-    ${ENGINE_DIR}/renderer/glsl_source/cameraEffects_vp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/computeLight_fp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/contrast_fp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/debugShadowMap_fp.glsl

src/engine/renderer/gl_shader.cpp

@@ -3048,13 +3048,11 @@ void GLShader_contrast::SetShaderProgramUniforms( ShaderProgramDescriptor *shade
 
 GLShader_cameraEffects::GLShader_cameraEffects( GLShaderManager *manager ) :
 	GLShader( "cameraEffects", ATTR_POSITION | ATTR_TEXCOORD, manager,
-		false, "cameraEffects", "cameraEffects" ),
+		false, "screenSpace", "cameraEffects" ),
 	u_ColorMap3D( this ),
 	u_CurrentMap( this ),
 	u_GlobalLightFactor( this ),
 	u_ColorModulate( this ),
-	u_TextureMatrix( this ),
-	u_ModelViewProjectionMatrix( this ),
 	u_Tonemap( this ),
 	u_TonemapParms( this ),
 	u_TonemapExposure( this ),

src/engine/renderer/gl_shader.h

@@ -4566,8 +4566,6 @@ class GLShader_cameraEffects :
 	public u_CurrentMap,
 	public u_GlobalLightFactor,
 	public u_ColorModulate,
-	public u_TextureMatrix,
-	public u_ModelViewProjectionMatrix,
 	public u_Tonemap,
 	public u_TonemapParms,
 	public u_TonemapExposure,

src/engine/renderer/glsl_source/cameraEffects_fp.glsl

@@ -32,8 +32,6 @@ uniform vec4      u_ColorModulate;
 uniform float     u_GlobalLightFactor; // 1 / tr.identityLight
 uniform float     u_InverseGamma;
 
-IN(smooth) vec2		var_TexCoords;
-
 DECLARE_OUTPUT(vec4)
 
 /* x: contrast

src/engine/renderer/glsl_source/cameraEffects_vp.glsl

@@ -3258,26 +3258,14 @@ static void ComputeTonemapParams( const float contrast, const float highlightsCo
 		) * darkAreaPointLDR );
 }
 
-void RB_CameraPostFX()
-{
-	matrix_t ortho;
-
+void RB_CameraPostFX() {
 	GLimp_LogComment( "--- RB_CameraPostFX ---\n" );
 
 	if ( ( backEnd.refdef.rdflags & RDF_NOWORLDMODEL ) ||
-	     backEnd.viewParms.portalLevel > 0 )
-	{
+	     backEnd.viewParms.portalLevel > 0 ) {
 		return;
 	}
 
-	// set 2D virtual screen size
-	GL_PushMatrix();
-	MatrixOrthogonalProjection( ortho, backEnd.viewParms.viewportX,
-	                            backEnd.viewParms.viewportX + backEnd.viewParms.viewportWidth,
-	                            backEnd.viewParms.viewportY, backEnd.viewParms.viewportY + backEnd.viewParms.viewportHeight,
-	                            -99999, 99999 );
-	GL_LoadProjectionMatrix( ortho );
-
 	GL_State( GLS_DEPTHTEST_DISABLE );
 	GL_Cull( cullType_t::CT_TWO_SIDED );
 
@@ -3306,18 +3294,11 @@ void RB_CameraPostFX()
 		GL_BindToTMU( 0, tr.currentRenderImage[backEnd.currentMainFBO] ) 
 	);
 
-	if ( glConfig2.colorGrading )
-	{
+	if ( glConfig2.colorGrading ) {
 		gl_cameraEffectsShader->SetUniform_ColorMap3DBindless( GL_BindToTMU( 3, tr.colorGradeImage ) );
 	}
 
-	// draw viewport
-	Tess_InstantQuad( *gl_cameraEffectsShader,
-	                  backEnd.viewParms.viewportX, backEnd.viewParms.viewportY,
-	                  backEnd.viewParms.viewportWidth, backEnd.viewParms.viewportHeight );
-
-	// go back to 3D
-	GL_PopMatrix();
+	Tess_InstantScreenSpaceQuad();
 
 	GL_CheckErrors();
 }