Implement rendering pipeline and post-processing (#12465)

Co-authored-by: Lars Mueller <appgurulars@gmx.de>
Co-authored-by: sfan5 <sfan5@live.de>
Co-authored-by: lhofhansl <lhofhansl@yahoo.com>

7 files changed, 75 insertions, 79 deletions

diff --git a/client/shaders/default_shader/opengl_fragment.glsl b/client/shaders/default_shader/opengl_fragment.glsl
index 5018ac6ea..300c0c589 100644
--- a/client/shaders/default_shader/opengl_fragment.glsl
+++ b/client/shaders/default_shader/opengl_fragment.glsl
@@ -2,5 +2,5 @@ varying lowp vec4 varColor;
 
 void main(void)
 {
-	gl_FragColor = varColor;
+	gl_FragData[0] = varColor;
 }
diff --git a/client/shaders/nodes_shader/opengl_fragment.glsl b/client/shaders/nodes_shader/opengl_fragment.glsl
index c4b947e72..1f7d98069 100644
--- a/client/shaders/nodes_shader/opengl_fragment.glsl
+++ b/client/shaders/nodes_shader/opengl_fragment.glsl
@@ -45,6 +45,9 @@ centroid varying vec2 varTexCoord;
 #endif
 varying vec3 eyeVec;
 varying float nightRatio;
+varying vec3 tsEyeVec;
+varying vec3 lightVec;
+varying vec3 tsLightVec;
 
 const float fogStart = FOG_START;
 const float fogShadingParameter = 1.0 / ( 1.0 - fogStart);
@@ -359,40 +362,6 @@ float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
 #endif
 #endif
 
-#if ENABLE_TONE_MAPPING
-
-/* Hable's UC2 Tone mapping parameters
-	A = 0.22;
-	B = 0.30;
-	C = 0.10;
-	D = 0.20;
-	E = 0.01;
-	F = 0.30;
-	W = 11.2;
-	equation used:  ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
-*/
-
-vec3 uncharted2Tonemap(vec3 x)
-{
-	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
-}
-
-vec4 applyToneMapping(vec4 color)
-{
-	color = vec4(pow(color.rgb, vec3(2.2)), color.a);
-	const float gamma = 1.6;
-	const float exposureBias = 5.5;
-	color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
-	// Precalculated white_scale from
-	//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
-	vec3 whiteScale = vec3(1.036015346);
-	color.rgb *= whiteScale;
-	return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
-}
-#endif
-
-
-
 void main(void)
 {
 	vec3 color;
@@ -470,10 +439,6 @@ void main(void)
 	}
 #endif
 
-#if ENABLE_TONE_MAPPING
-	col = applyToneMapping(col);
-#endif
-
 	// Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
 	// the fog will only be rendered correctly if the last operation before the
 	// clamp() is an addition. Else, the clamp() seems to be ignored.
@@ -488,5 +453,5 @@ void main(void)
 	col = mix(skyBgColor, col, clarity);
 	col = vec4(col.rgb, base.a);
 
-	gl_FragColor = col;
+	gl_FragData[0] = col;
 }
diff --git a/client/shaders/nodes_shader/opengl_vertex.glsl b/client/shaders/nodes_shader/opengl_vertex.glsl
index 40f0965e1..42fae7612 100644
--- a/client/shaders/nodes_shader/opengl_vertex.glsl
+++ b/client/shaders/nodes_shader/opengl_vertex.glsl
@@ -42,6 +42,7 @@ centroid varying vec2 varTexCoord;
 	varying float perspective_factor;
 #endif
 
+varying float area_enable_parallax;
 
 varying vec3 eyeVec;
 varying float nightRatio;
@@ -193,6 +194,9 @@ void main(void)
 
 	vPosition = gl_Position.xyz;
 	eyeVec = -(mWorldView * pos).xyz;
+#ifdef SECONDSTAGE
+	normalPass = normalize((inVertexNormal+1)/2);
+#endif
 	vNormal = inVertexNormal;
 
 	// Calculate color.
diff --git a/client/shaders/object_shader/opengl_fragment.glsl b/client/shaders/object_shader/opengl_fragment.glsl
index 1fefc764b..662d0c865 100644
--- a/client/shaders/object_shader/opengl_fragment.glsl
+++ b/client/shaders/object_shader/opengl_fragment.glsl
@@ -361,39 +361,6 @@ float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
 #endif
 #endif
 
-#if ENABLE_TONE_MAPPING
-
-/* Hable's UC2 Tone mapping parameters
-	A = 0.22;
-	B = 0.30;
-	C = 0.10;
-	D = 0.20;
-	E = 0.01;
-	F = 0.30;
-	W = 11.2;
-	equation used:  ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
-*/
-
-vec3 uncharted2Tonemap(vec3 x)
-{
-	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
-}
-
-vec4 applyToneMapping(vec4 color)
-{
-	color = vec4(pow(color.rgb, vec3(2.2)), color.a);
-	const float gamma = 1.6;
-	const float exposureBias = 5.5;
-	color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
-	// Precalculated white_scale from
-	//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
-	vec3 whiteScale = vec3(1.036015346);
-	color.rgb *= whiteScale;
-	return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
-}
-#endif
-
-
 
 void main(void)
 {
@@ -473,10 +440,6 @@ void main(void)
 	}
 #endif
 
-#if ENABLE_TONE_MAPPING
-	col = applyToneMapping(col);
-#endif
-
 	// Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
 	// the fog will only be rendered correctly if the last operation before the
 	// clamp() is an addition. Else, the clamp() seems to be ignored.
@@ -491,5 +454,5 @@ void main(void)
 	col = mix(skyBgColor, col, clarity);
 	col = vec4(col.rgb, base.a);
 
-	gl_FragColor = col;
+	gl_FragData[0] = col;
 }
diff --git a/client/shaders/second_stage/opengl_fragment.glsl b/client/shaders/second_stage/opengl_fragment.glsl
new file mode 100644
index 000000000..965450fcb
--- /dev/null
+++ b/client/shaders/second_stage/opengl_fragment.glsl
@@ -0,0 +1,53 @@
+uniform sampler2D baseTexture;
+
+#define rendered baseTexture
+
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
+
+#if ENABLE_TONE_MAPPING
+
+/* Hable's UC2 Tone mapping parameters
+	A = 0.22;
+	B = 0.30;
+	C = 0.10;
+	D = 0.20;
+	E = 0.01;
+	F = 0.30;
+	W = 11.2;
+	equation used:  ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F
+*/
+
+vec3 uncharted2Tonemap(vec3 x)
+{
+	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
+}
+
+vec4 applyToneMapping(vec4 color)
+{
+	color = vec4(pow(color.rgb, vec3(2.2)), color.a);
+	const float gamma = 1.6;
+	const float exposureBias = 5.5;
+	color.rgb = uncharted2Tonemap(exposureBias * color.rgb);
+	// Precalculated white_scale from
+	//vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
+	vec3 whiteScale = vec3(1.036015346);
+	color.rgb *= whiteScale;
+	return vec4(pow(color.rgb, vec3(1.0 / gamma)), color.a);
+}
+#endif
+
+void main(void)
+{
+	vec2 uv = varTexCoord.st;
+	vec4 color = texture2D(rendered, uv).rgba;
+
+#if ENABLE_TONE_MAPPING
+	color = applyToneMapping(color);
+#endif
+
+	gl_FragColor = vec4(color.rgb, 1.0); // force full alpha to avoid holes in the image.
+}
diff --git a/client/shaders/second_stage/opengl_vertex.glsl b/client/shaders/second_stage/opengl_vertex.glsl
new file mode 100644
index 000000000..12692c296
--- /dev/null
+++ b/client/shaders/second_stage/opengl_vertex.glsl
@@ -0,0 +1,11 @@
+#ifdef GL_ES
+varying mediump vec2 varTexCoord;
+#else
+centroid varying vec2 varTexCoord;
+#endif
+
+void main(void)
+{
+	varTexCoord.st = inTexCoord0.st;
+	gl_Position = inVertexPosition;
+}
diff --git a/client/shaders/selection_shader/opengl_fragment.glsl b/client/shaders/selection_shader/opengl_fragment.glsl
index 35b1f8902..2094ea0f4 100644
--- a/client/shaders/selection_shader/opengl_fragment.glsl
+++ b/client/shaders/selection_shader/opengl_fragment.glsl
@@ -8,5 +8,5 @@ void main(void)
 	vec2 uv = varTexCoord.st;
 	vec4 color = texture2D(baseTexture, uv);
 	color.rgb *= varColor.rgb;
-	gl_FragColor = color;
+	gl_FragData[0] = color;
 }