Shaders - Relative paths

Shaders are no longer found under /shaders in the project; they can be
anywhere. In addition, paths for both (program) instructions in the
script and include directives in shader source code are relative to the
file which contains them.

test/fx-fxaa/fx-fxaa.srd

@@ -0,0 +1,53 @@
+################################################################################
+# FXAA
+
+(fn fxaa-init ()
+	(program prg-fxaa "fxaa.f.glsl")
+	(pipeline pl-fxaa prg-fullscreen prg-fxaa)
+
+	(sampler smp-fxaa
+		(sampling linear)
+		(wrapping clamp-border))
+
+	(input fxaa-subpixel .5)
+	(input fxaa-et .166)
+	(input fxaa-et-min .0833)
+
+	(ui-overrides
+		(section "Post-processing"
+			(section "FXAA"
+				(float "Sub-pixel quality" fxaa-subpixel
+					(min 0) (max 1) (slider))
+				(float "Edge threshold" fxaa-et
+					(min .063) (max .333) (slider))
+				(float "Edge threshold min." fxaa-et-min
+					(min .0312) (max .0833) (decimals 4)
+					(slider))
+			)
+		)
+	)
+)
+
+(fn fxaa-render (in-image)
+	(profiling "FXAA"
+		(uniforms-i prg-fxaa 0 0)
+		(uniforms prg-fxaa 1
+			$vp-x $vp-y $vp-width $vp-height)
+
+		(main-output)
+		(viewport 0 0 $width $height)
+		(clear 0 0 0 0)
+
+		(use-pipeline pl-fxaa)
+		(use-texture 0 in-image smp-fxaa)
+		(uniforms prg-fxaa 2
+			(get-input fxaa-subpixel)
+			(get-input fxaa-et)
+			(get-input fxaa-et-min))
+		(viewport $vp-x $vp-y $vp-width $vp-height)
+		(fullscreen)
+	)
+)
+
+
+# vim: syntax=demo-srd

test/fx-fxaa/fxaa.f.glsl

@@ -0,0 +1,44 @@
+#version 450 core
+
+//! type fragment
+
+#define FXAA_PC 1
+#define FXAA_GLSL_130 1
+#define FXAA_FAST_PIXEL_OFFSET 1
+#define FXAA_GATHER4_ALPHA 1
+#define FXAA_QUALITY__PRESET 39
+
+//! include fxaa-3.11.glsl
+
+layout( location = 0 ) uniform sampler2D u_Input;
+layout( location = 1 ) uniform vec4 u_Viewport;
+layout( location = 2 ) uniform vec3 u_Parameters;
+
+#define uSPQuality (u_Parameters.x)
+#define uEdgeThreshold (u_Parameters.y)
+#define uEdgeThresholdMin (u_Parameters.z)
+
+layout( location = 0 ) out vec4 o_Color;
+
+void main( void )
+{
+	vec2 coords = gl_FragCoord.xy - u_Viewport.xy;
+	o_Color = FxaaPixelShader(
+		( coords / u_Viewport.zw ) ,	// pos (vec2)
+		vec4( 0 ) ,		// unused (vec4)
+		u_Input ,		// input texture
+		u_Input ,		// (unused) input texture
+		u_Input ,		// (unused) input texture
+		vec2( 1 ) / u_Viewport.zw , // 1/resolution (vec2)
+		vec4( 0 ) ,		// unused (vec4)
+		vec4( 0 ) ,		// unused (vec4)
+		vec4( 0 ) ,		// unused (vec4)
+		uSPQuality ,		// sub-pixel quality (float in [0;1])
+		uEdgeThreshold ,	// edge threshold (float, [.063;.333], lower = better)
+		uEdgeThresholdMin ,	// edge threshold min (float, [0.0312;0.0833],
+					//	higher = better)
+		0 ,			// unused (float)
+		0 ,			// unused (float)
+		0 ,			// unused (float)
+		vec4( 0 ) );		// unused (vec4)
+}