Add texture bumpmapping feature.

client/shaders/bumpmaps_liquids/base.txt

@@ -0,0 +1 @@
+trans_alphach

client/shaders/bumpmaps_liquids/opengl_fragment.glsl

@@ -0,0 +1,47 @@
+
+uniform sampler2D myTexture;
+uniform sampler2D normalTexture;
+
+uniform vec4 skyBgColor;
+uniform float fogDistance;
+
+varying vec3 vPosition;
+
+varying vec3 viewVec;
+
+void main (void)
+{
+	vec4 col = texture2D(myTexture, vec2(gl_TexCoord[0]));
+	float alpha = col.a;
+	vec2 uv = gl_TexCoord[0].st;
+	vec4 base = texture2D(myTexture, uv);
+	vec4 final_color = vec4(0.2, 0.2, 0.2, 1.0) * base;
+	vec3 vVec = normalize(viewVec);
+	vec3 bump = normalize(texture2D(normalTexture, uv).xyz * 2.0 - 1.0);
+	vec3 R = reflect(-vVec, bump);
+	vec3 lVec = normalize(vec3(0.0, -0.4, 0.5));
+	float diffuse = max(dot(lVec, bump), 0.0);
+  
+	vec3 color = diffuse * texture2D(myTexture, gl_TexCoord[0].st).rgb;
+	
+	
+	float specular = pow(clamp(dot(R, lVec), 0.0, 1.0),1.0);
+	vec4 vSpecular = 0.2*specular * diffuse;	
+    color += vSpecular;
+ 
+  
+	col = vec4(color.r, color.g, color.b, alpha);
+	col *= gl_Color;
+	col = col * col; // SRGB -> Linear
+	col *= 1.8;
+	col.r = 1.0 - exp(1.0 - col.r) / exp(1.0);
+	col.g = 1.0 - exp(1.0 - col.g) / exp(1.0);
+	col.b = 1.0 - exp(1.0 - col.b) / exp(1.0);
+	col = sqrt(col); // Linear -> SRGB
+	if(fogDistance != 0.0){
+		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
+		alpha = mix(alpha, 0.0, d);
+	}
+
+    gl_FragColor = vec4(col.r, col.g, col.b, alpha);   
+}

client/shaders/bumpmaps_liquids/opengl_vertex.glsl

@@ -0,0 +1,98 @@
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+uniform float dayNightRatio;
+
+varying vec3 vPosition;
+varying vec3 viewVec;
+
+void main(void)
+{
+	gl_Position = mWorldViewProj * gl_Vertex;
+
+	vPosition = (mWorldViewProj * gl_Vertex).xyz;
+	
+	vec3 tangent; 
+	vec3 binormal; 
+
+	vec3 c1 = cross( gl_Normal, vec3(0.0, 0.0, 1.0) ); 
+	vec3 c2 = cross( gl_Normal, vec3(0.0, 1.0, 0.0) ); 
+
+	if( length(c1)>length(c2) )
+	{
+		tangent = c1;	
+	}
+	else
+	{
+		tangent = c2;	
+	}
+
+	tangent = normalize(tangent);
+
+//binormal = cross(gl_Normal, tangent); 
+//binormal = normalize(binormal);
+
+	vec4 color;
+	//color = vec4(1.0, 1.0, 1.0, 1.0);
+
+	float day = gl_Color.r;
+	float night = gl_Color.g;
+	float light_source = gl_Color.b;
+
+	/*color.r = mix(night, day, dayNightRatio);
+	color.g = color.r;
+	color.b = color.r;*/
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 1.5; // Make light sources brighter
+	float b = rg;
+
+	// Moonlight is blue
+	b += (day - night) / 13.0;
+	rg -= (day - night) / 13.0;
+
+	// Emphase blue a bit in darker places
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	b += max(0.0, (1.0 - abs(b - 0.13)/0.17) * 0.025);
+
+	// Artificial light is yellow-ish
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	rg += max(0.0, (1.0 - abs(rg - 0.85)/0.15) * 0.065);
+
+	color.r = rg;
+	color.g = rg;
+	color.b = b;
+
+	// Make sides and bottom darker than the top
+	color = color * color; // SRGB -> Linear
+	if(gl_Normal.y <= 0.5)
+		color *= 0.6;
+		//color *= 0.7;
+	color = sqrt(color); // Linear -> SRGB
+
+	color.a = gl_Color.a;
+
+	gl_FrontColor = gl_BackColor = color;
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	
+	vec3 n1 = normalize(gl_NormalMatrix * gl_Normal);
+	vec4 tangent1 = vec4(tangent.x, tangent.y, tangent.z, 0);
+	//vec3 t1 = normalize(gl_NormalMatrix * tangent1);
+	//vec3 b1 = cross(n1, t1);
+
+	vec3 v;
+	vec3 vVertex = vec3(gl_ModelViewMatrix * gl_Vertex);
+	vec3 vVec = -vVertex;
+	//v.x = dot(vVec, t1);
+	//v.y = dot(vVec, b1);
+	//v.z = dot(vVec, n1);
+	//viewVec = vVec;
+	viewVec = normalize(vec3(0.0, -0.4, 0.5));
+	//Vector representing the 0th texture coordinate passed to fragment shader
+//gl_TexCoord[0] = vec2(gl_MultiTexCoord0);
+
+// Transform the current vertex
+//gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+}

client/shaders/bumpmaps_solids/base.txt

@@ -0,0 +1 @@
+trans_alphach_ref

client/shaders/bumpmaps_solids/opengl_fragment.glsl

@@ -0,0 +1,46 @@
+
+uniform sampler2D myTexture;
+uniform sampler2D normalTexture;
+
+uniform vec4 skyBgColor;
+uniform float fogDistance;
+
+varying vec3 vPosition;
+
+varying vec3 viewVec;
+
+void main (void)
+{
+	vec4 col = texture2D(myTexture, vec2(gl_TexCoord[0]));
+	float alpha = col.a;
+	vec2 uv = gl_TexCoord[0].st;
+	vec4 base = texture2D(myTexture, uv);
+	vec4 final_color = vec4(0.2, 0.2, 0.2, 1.0) * base;
+	vec3 vVec = normalize(viewVec);
+	vec3 bump = normalize(texture2D(normalTexture, uv).xyz * 2.0 - 1.0);
+	vec3 R = reflect(-vVec, bump);
+	vec3 lVec = normalize(vec3(0.0, -0.4, 0.5));
+	float diffuse = max(dot(lVec, bump), 0.0);
+  
+	vec3 color = diffuse * texture2D(myTexture, gl_TexCoord[0].st).rgb;
+	
+	
+	float specular = pow(clamp(dot(R, lVec), 0.0, 1.0),1.0);
+	vec4 vSpecular = 0.2*specular * diffuse;	
+    color += vSpecular;
+ 
+  
+	col = vec4(color.r, color.g, color.b, alpha);
+	col *= gl_Color;
+	col = col * col; // SRGB -> Linear
+	col *= 1.8;
+	col.r = 1.0 - exp(1.0 - col.r) / exp(1.0);
+	col.g = 1.0 - exp(1.0 - col.g) / exp(1.0);
+	col.b = 1.0 - exp(1.0 - col.b) / exp(1.0);
+	col = sqrt(col); // Linear -> SRGB
+	if(fogDistance != 0.0){
+		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
+		col = mix(col, skyBgColor, d);
+	}
+    gl_FragColor = vec4(col.r, col.g, col.b, alpha);   
+}

client/shaders/bumpmaps_solids/opengl_vertex.glsl

@@ -0,0 +1,98 @@
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+uniform float dayNightRatio;
+
+varying vec3 vPosition;
+varying vec3 viewVec;
+
+void main(void)
+{
+	gl_Position = mWorldViewProj * gl_Vertex;
+
+	vPosition = (mWorldViewProj * gl_Vertex).xyz;
+	
+	vec3 tangent; 
+	vec3 binormal; 
+
+	vec3 c1 = cross( gl_Normal, vec3(0.0, 0.0, 1.0) ); 
+	vec3 c2 = cross( gl_Normal, vec3(0.0, 1.0, 0.0) ); 
+
+	if( length(c1)>length(c2) )
+	{
+		tangent = c1;	
+	}
+	else
+	{
+		tangent = c2;	
+	}
+
+	tangent = normalize(tangent);
+
+//binormal = cross(gl_Normal, tangent); 
+//binormal = normalize(binormal);
+
+	vec4 color;
+	//color = vec4(1.0, 1.0, 1.0, 1.0);
+
+	float day = gl_Color.r;
+	float night = gl_Color.g;
+	float light_source = gl_Color.b;
+
+	/*color.r = mix(night, day, dayNightRatio);
+	color.g = color.r;
+	color.b = color.r;*/
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 1.5; // Make light sources brighter
+	float b = rg;
+
+	// Moonlight is blue
+	b += (day - night) / 13.0;
+	rg -= (day - night) / 13.0;
+
+	// Emphase blue a bit in darker places
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	b += max(0.0, (1.0 - abs(b - 0.13)/0.17) * 0.025);
+
+	// Artificial light is yellow-ish
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	rg += max(0.0, (1.0 - abs(rg - 0.85)/0.15) * 0.065);
+
+	color.r = rg;
+	color.g = rg;
+	color.b = b;
+
+	// Make sides and bottom darker than the top
+	color = color * color; // SRGB -> Linear
+	if(gl_Normal.y <= 0.5)
+		color *= 0.6;
+		//color *= 0.7;
+	color = sqrt(color); // Linear -> SRGB
+
+	color.a = gl_Color.a;
+
+	gl_FrontColor = gl_BackColor = color;
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	
+	vec3 n1 = normalize(gl_NormalMatrix * gl_Normal);
+	vec4 tangent1 = vec4(tangent.x, tangent.y, tangent.z, 0);
+	//vec3 t1 = normalize(gl_NormalMatrix * tangent1);
+	//vec3 b1 = cross(n1, t1);
+
+	vec3 v;
+	vec3 vVertex = vec3(gl_ModelViewMatrix * gl_Vertex);
+	vec3 vVec = -vVertex;
+	//v.x = dot(vVec, t1);
+	//v.y = dot(vVec, b1);
+	//v.z = dot(vVec, n1);
+	//viewVec = vVec;
+	viewVec = normalize(vec3(0.0, -0.4, 0.5));
+	//Vector representing the 0th texture coordinate passed to fragment shader
+//gl_TexCoord[0] = vec2(gl_MultiTexCoord0);
+
+// Transform the current vertex
+//gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+}

minetest.conf.example

@@ -172,6 +172,8 @@
 # (1: low level shaders; not implemented)
 # 2: enable high level shaders
 #enable_shaders = 2
+# Set to true to enable textures bumpmapping. Requires shaders enabled.
+#enable_bumpmapping = false
 # The time in seconds it takes between repeated
 # right clicks when holding the right mouse button
 #repeat_rightclick_time = 0.25

src/defaultsettings.cpp

@@ -127,6 +127,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("trilinear_filter", "false");
 	settings->setDefault("preload_item_visuals", "true");
 	settings->setDefault("enable_shaders", "2");
+	settings->setDefault("enable_bumpmapping", "false");
 	settings->setDefault("repeat_rightclick_time", "0.25");
 	settings->setDefault("enable_particles", "true");
 

src/game.cpp

@@ -804,6 +804,10 @@ public:
 		u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
 		float daynight_ratio_f = (float)daynight_ratio / 1000.0;
 		services->setPixelShaderConstant("dayNightRatio", &daynight_ratio_f, 1);
+		
+		// Normal map texture layer
+		int layer = 1;
+		services->setPixelShaderConstant("normalTexture" , (irr::f32*)&layer, 1);
 	}
 };
 

src/mapblock_mesh.cpp

@@ -1072,12 +1072,18 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data):
 		Also store animation info
 	*/
 	bool enable_shaders = (g_settings->getS32("enable_shaders") > 0);
+	bool enable_bumpmapping = g_settings->getBool("enable_bumpmapping");
 	video::E_MATERIAL_TYPE shadermat1 = m_gamedef->getShaderSource()->
 			getShader("test_shader_1").material;
 	video::E_MATERIAL_TYPE shadermat2 = m_gamedef->getShaderSource()->
 			getShader("test_shader_2").material;
 	video::E_MATERIAL_TYPE shadermat3 = m_gamedef->getShaderSource()->
 			getShader("test_shader_3").material;
+	video::E_MATERIAL_TYPE bumpmaps1 = m_gamedef->getShaderSource()->
+			getShader("bumpmaps_solids").material;
+	video::E_MATERIAL_TYPE bumpmaps2 = m_gamedef->getShaderSource()->
+			getShader("bumpmaps_liquids").material;
+
 	for(u32 i = 0; i < collector.prebuffers.size(); i++)
 	{
 		PreMeshBuffer &p = collector.prebuffers[i];
@@ -1154,8 +1160,33 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data):
 		material.MaterialType
 				= video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 		material.setTexture(0, p.tile.texture);
-		if(enable_shaders)
+		if (enable_shaders)
+			{
+				if (enable_bumpmapping)
+					{
+						ITextureSource *tsrc = data->m_gamedef->tsrc();
+						std::string basename,normal,replace;
+						replace = "_normal.png";
+						basename = tsrc->getTextureName(p.tile.texture_id);
+						unsigned pos = basename.find(".");
+						normal = basename.substr (0, pos) + replace;
+						if (tsrc->isKnownSourceImage(normal))
+							{
+								// look for image extension and replace it 
+								for(std::string::size_type i = 0; (i = basename.find(".", i)) != std::string::npos;)
+									{
+										basename.replace(i, 4, replace);
+										i += replace.length();
+									}
+								material.setTexture(1, tsrc->getTexture(basename));		
+								p.tile.applyMaterialOptionsWithShaders(material, bumpmaps1,bumpmaps2, shadermat3);
+							}
+						else 
 							p.tile.applyMaterialOptionsWithShaders(material, shadermat1, shadermat2, shadermat3);
+					}
+				else 		
+						p.tile.applyMaterialOptionsWithShaders(material, shadermat1, shadermat2, shadermat3);	
+			}
 		else
 			p.tile.applyMaterialOptions(material);
 
@@ -1217,6 +1248,9 @@ MapBlockMesh::~MapBlockMesh()
 
 bool MapBlockMesh::animate(bool faraway, float time, int crack, u32 daynight_ratio)
 {
+	bool enable_shaders = (g_settings->getS32("enable_shaders") > 0);
+	bool enable_bumpmapping = g_settings->getBool("enable_bumpmapping");
+	
 	if(!m_has_animation)
 	{
 		m_animation_force_timer = 100000;
@@ -1271,6 +1305,19 @@ bool MapBlockMesh::animate(bool faraway, float time, int crack, u32 daynight_rat
 		os<<"^[verticalframe:"<<(int)tile.animation_frame_count<<":"<<frame;
 		// Set the texture
 		buf->getMaterial().setTexture(0, tsrc->getTexture(os.str()));
+		if (enable_shaders && enable_bumpmapping)
+			{
+				std::string basename,normal;
+				basename = tsrc->getTextureName(tile.texture_id);
+				unsigned pos;
+				pos = basename.find(".");
+				normal = basename.substr (0, pos);
+				normal += "_normal.png";
+				os.str("");
+				os<<normal<<"^[verticalframe:"<<(int)tile.animation_frame_count<<":"<<frame;
+				if (tsrc->isKnownSourceImage(normal))
+					buf->getMaterial().setTexture(1, tsrc->getTexture(os.str()));
+			}
 	}
 
 	// Day-night transition

util/generate-texture-normals.sh

@@ -0,0 +1,255 @@
+#!/bin/bash
+
+# This script generates normalmaps using The GIMP to do the heavy lifting.
+# give any unrecognized switch (say, -h) for usage info.
+
+rm /tmp/normals_filelist.txt
+
+numprocs=6
+
+skiptools=false
+skipinventory=false
+invresolution=64
+dryrun=false
+pattern="*.png *.jpg"
+
+filter=0
+scale=8
+wrap=0
+heightsource=0
+conversion=0
+invertx=0
+inverty=0
+
+while test -n "$1"; do
+	case "$1" in
+		--scale|-s)
+			if [ -z "$2" ] ; then echo "Missing scale parameter"; exit 1; fi
+			scale=$2
+			shift
+			shift
+			;;
+		--pattern|-p)
+			if [ -z "$2" ] ; then echo "Missing pattern parameter"; exit 1; fi
+			pattern=$2
+			shift
+			shift
+			;;
+		--skiptools|-t)
+			skiptools=true
+			shift
+			;;
+		--skipinventory|-i)
+			if [[ $2 =~ ^[0-9]+$ ]]; then
+				invresolution=$2
+				shift
+			fi
+			skipinventory=true
+			shift
+			;;
+		--filter|-f)
+			if [ -z "$2" ] ; then echo "Missing filter parameter"; exit 1; fi
+
+			case "$2" in
+				sobel3|1)
+					filter=1
+					;;
+				sobel5|2)
+					filter=2
+					;;
+				prewitt3|3)
+					filter=3
+					;;
+				prewitt5|4)
+					filter=4
+					;;
+				3x3|5)
+					filter=5
+					;;
+				5x5|6)
+					filter=6
+					;;
+				7x7|7)
+					filter=7
+					;;
+				9x9|8)
+					filter=8
+					;;
+				*)
+					filter=0
+					;;
+			esac
+
+			shift
+			shift
+			;;
+		--heightalpha|-a)
+			heightsource=1
+			shift
+			;;
+		--conversion|-c)
+				if [ -z "$2" ] ; then echo "Missing conversion parameter"; exit 1; fi
+
+				case "$2" in
+					biased|1)
+						conversion=1
+						;;
+					red|2)
+						conversion=2
+						;;
+					green|3)
+						conversion=3
+						;;
+					blue|4)
+						conversion=4
+						;;
+					maxrgb|5)
+						conversion=5
+						;;
+					minrgb|6)
+						conversion=6
+						;;
+					colorspace|7)
+						conversion=7
+						;;
+					normalize-only|8)
+						conversion=8
+						;;
+					heightmap|9)
+						conversion=9
+						;;
+					*)
+						conversion=0
+						;;
+			esac
+
+			shift
+			shift
+			;;
+		--wrap|-w)
+			wrap=1
+			shift
+			;;
+		--invertx|-x)
+			invertx=1
+			shift
+			;;
+		--inverty|-y)
+			inverty=1
+			shift
+			;;
+		--dryrun|-d)
+			dryrun=true
+			shift
+			;;
+		*)
+			echo -e "\nUsage:\n"
+			echo "`basename $0` [--scale|-s <value>] [--filter|-f <string>]"
+			echo " [--wrap|-w] [--heightalpha|-a] [--invertx|-x] [--inverty|-y]"
+			echo " [--conversion|-c <string>] [--skiptools|-t] [--skipinventory|-i [<value>]]"
+			echo " [--dryrun|-d] [--pattern|-p <pattern>]"
+			echo -e "\nDefaults to a scale of 8, checking all files in the current directory, and not"
+			echo "skipping apparent tools or inventory images.  Filter, if specified, may be one"
+			echo "of: sobel3, sobel5, prewitt3, prewitt5, 3x3, 5x5, 7x7, or 9x9, or a value 1"
+			echo "through 8 (1=sobel3, 2=sobel5, etc.). Defaults to 0 (four-sample).  The height"
+			echo "source is taken from the image's alpha channel if heightalpha is specified.\n"
+			echo ""
+			echo "If inventory skip is specified, an optional resolution may also be included"
+			echo "(default is 64).  Conversion can be one of: biased, red, green, blue, maxrgb,"
+			echo "minrgb, colorspace, normalize-only, heightmap or a value from 1 to 9"
+			echo "corresponding respectively to those keywords.  Defaults to 0 (simple"
+			echo "normalize) if not specified.  Wrap, if specified, enables wrapping of the"
+			echo "normalmap around the edges of the texture (defaults to no).  Invert X/Y"
+			echo "reverses the calculated gradients  for the X and/or Y dimensions represented"
+			echo "by the normalmap (both default to non-inverted)."
+			echo ""
+			echo "The pattern, can be an escaped pattern string such as \*apple\* or"
+			echo "default_\*.png or similar (defaults to all PNG and JPG images in the current"
+			echo "directory that do not contain \"_normal\" or \"_specular\" in their filenames)."
+			echo ""
+			echo "If set for dry-run, the actions this script will take will be printed, but no"
+			echo "images will be generated.  Passing an invalid value to a switch will generally"
+			echo "cause that switch to revert to its default value."
+			echo ""
+			exit 1
+			;;
+	esac
+done
+
+echo -e "\nProcessing files based on pattern \"$pattern\" ..."
+
+normalMap()
+{
+	out=`echo "$1" | sed 's/.png/_normal.png/' | sed 's/.jpg/_normal.png/'`
+
+	echo "Launched process to generate normalmap: \"$1\" --> \"$out\"" >&2
+
+	gimp -i -b "
+		(define
+			(normalMap-fbx-conversion fileName newFileName filter nscale wrap heightsource conversion invertx inverty)
+			(let*
+				(
+					(image (car (gimp-file-load RUN-NONINTERACTIVE fileName fileName)))
+					(drawable (car (gimp-image-get-active-layer image)))
+					(drawable (car (gimp-image-flatten image)))
+				)
+				(if (> (car (gimp-drawable-type drawable)) 1)
+					(gimp-convert-rgb image) ()
+				)
+
+				(plug-in-normalmap 
+					RUN-NONINTERACTIVE
+					image
+					drawable
+					filter
+					0.0
+					nscale
+					wrap
+					heightsource
+					0
+					conversion
+					0
+					invertx
+					inverty
+					0
+					0.0
+					drawable)
+				(gimp-file-save RUN-NONINTERACTIVE image drawable newFileName newFileName)
+				(gimp-image-delete image)
+			)
+		)
+		(normalMap-fbx-conversion \"$1\" \"$out\" $2 $3 $4 $5 $6 $7 $8)" -b '(gimp-quit 0)'
+}
+
+export -f normalMap
+
+for file in `ls $pattern |grep -v "_normal.png"|grep -v "_specular"` ; do
+
+	invtest=`file "$file" |grep "$invresolution x $invresolution"`
+	if $skipinventory && [ -n "$invtest" ] ; then
+		echo "Skipped presumed "$invresolution"px inventory image: $file" >&2
+		continue
+	fi
+
+	tooltest=`echo "$file" \
+		| grep -v "_tool" \
+		| grep -v "_shovel" \
+		| grep -v "_pick" \
+		| grep -v "_axe" \
+		| grep -v "_sword" \
+		| grep -v "_hoe" \
+		| grep -v "bucket_"`
+
+	if $skiptools && [ -z "$tooltest" ] ; then
+		echo "Skipped presumed tool image: $file" >&2
+		continue
+	fi
+
+	if $dryrun ; then
+		echo "Would have generated a normalmap for $file" >&2
+		continue
+	else
+		echo \"$file\" $filter $scale $wrap $heightsource $conversion $invertx $inverty
+	fi
+done | xargs -P $numprocs -n 8 -I{} bash -c normalMap\ \{\}\ \{\}\ \{\}\ \{\}\ \{\}\ \{\}\ \{\}\ \{\}
+