tangent space light for all objects

cw 7/shaders/shader_5_1_tex.frag

@@ -18,7 +18,6 @@ uniform float reflectorAngle;
 uniform float reflectorLightExp;
 
 vec3 normalizedVertexNormal;
-mat3 TBN;
 
 in vec3 vertexPosWld;
 in vec2 vertexTexCoordOut;

cw 7/shaders/shader_5_1_tex.vert

@@ -32,6 +32,7 @@ void main()
 	
 	//`lightPos - vertexPos` from tutorial is wrong?
 	//TODO why should we normalize here if we would normalize Tangent Space vectors later?
+	// and why do it here, mb fragment shader?
 	vec3 sunLightDir = normalize(vertexPosWld - sunPos);
 	vec3 reflectorLightDir = normalize(vertexPosWld - reflectorPos);
 	vec3 viewDir = normalize(cameraPos - vertexPosWld);

cw 7/shaders/shader_earth.frag

@@ -2,6 +2,7 @@
 
 uniform sampler2D colorTexture;
 uniform sampler2D clouds;
+uniform sampler2D normalSampler;
 
 uniform vec3 sunPos;
 uniform vec3 sunColor;
@@ -18,40 +19,40 @@ uniform float reflectorLightExp;
 
 vec3 normalizedVertexNormal;
 
-in vec3 vertexNormalOut;
+in vec3 vertexPosWld;
-in vec3 vertexPosOut;
 in vec2 vertexTexCoordOut;
+in vec3 viewDirTS;
+in vec3 sunLightDirTS;
+in vec3 reflectorLightDirTS;
 
 out vec4 outColor;
 
-vec4 calcPointLight(vec3 fragColor, vec3 lightPos, vec3 lightColor, float lightExp) {
+vec4 calcPointLight(vec3 fragColor, vec3 lightPos, vec3 lightDirTS, vec3 lightColor, float lightExp) {
-	vec3 lightDir = normalize(vertexPosOut - lightPos);
+	float lightDistance = length(vertexPosWld - lightPos);
-	float lightDistance = length(vertexPosOut - lightPos);
 	vec3 newLightColor = lightColor / pow(lightDistance, 2);
 
-	float intensity = dot(normalizedVertexNormal, -lightDir);
+	float intensity = dot(normalizedVertexNormal, -lightDirTS);
 	intensity  = max(intensity, 0.0);
 	
-	vec3 viewDir = normalize(cameraPos - vertexPosOut);
+	vec3 reflectDir = reflect(lightDirTS, normalizedVertexNormal);
-	vec3 reflectDir = reflect(lightDir, normalizedVertexNormal);
+
-	
 	float glossPow = 8;
-	float specular = pow(max(dot(viewDir, reflectDir), 0.0), glossPow);
+	float specular = pow(max(dot(viewDirTS, reflectDir), 0.0), glossPow);
 
 	float diffuse = intensity;
 	vec3 resultColor = newLightColor * (fragColor * diffuse + specular );
 	return vec4(1 - exp(-resultColor  * lightExp), 1.0);
 }
 
-vec4 calcSpotLight(vec3 fragColor, vec3 lightPos, vec3 lightColor, vec3 lightDir,
+vec4 calcSpotLight(vec3 fragColor, vec3 lightPos, vec3 lightDirTS, vec3 lightColor, float lightExp) {
-				   float innerCutOff, float outerCutOff, float lightExp) {
+	vec3 reflectorLightDir = normalize(vertexPosWld - lightPos);
-	vec3 lightToFragDir = normalize(vertexPosOut - lightPos);
+	float angleCos = dot(reflectorLightDir, reflectorDir);
-	float angleCos = dot(lightToFragDir, lightDir);
+	float reflectorOutAngle = reflectorAngle + radians(10);
-	float epsilon = cos(innerCutOff) - cos(outerCutOff);
+	float epsilon = cos(reflectorAngle) - cos(reflectorOutAngle);
 	vec4 res = vec4(0, 0, 0, 1);
-	if (angleCos > cos(outerCutOff)) {
+	if (angleCos > cos(reflectorOutAngle)) {
-		float intensity = clamp((angleCos - cos(outerCutOff)) / epsilon, 0.0, 1.0);  
+		float intensity = clamp((angleCos - cos(reflectorOutAngle)) / epsilon, 0.0, 1.0);  
-		res = calcPointLight(fragColor, lightPos, lightColor, reflectorLightExp  * intensity);
+		res = calcPointLight(fragColor, lightPos, lightDirTS, lightColor, lightExp  * intensity);
 	}
 	return res;
 }
@@ -62,13 +63,22 @@ void main()
 	vec3 textureColor = texture2D(colorTexture, vertexTexCoordOut).rgb;
 	vec3 cloudColor = texture2D(clouds, vertexTexCoordOut).rgb;
 
-	textureColor = mix(vec3(1), textureColor, cloudColor.r);
+	//disabled to prevent riffled clouds
+	//textureColor = mix(vec3(1), textureColor, cloudColor.r);
 	
-	normalizedVertexNormal = normalize(vertexNormalOut);
+	//get normal from normal sampler
+	vec3 samplerNormal = texture2D(normalSampler, vertexTexCoordOut).xyz;
+	samplerNormal = 2 * samplerNormal - 1;//since sampler has values from [0, 1], but we want [-1, 1]
+	normalizedVertexNormal = normalize(samplerNormal);// to avoid potential precision problems in sampler texture
 
-	outColor = calcPointLight(textureColor, sunPos, sunColor, sunLightExp);
+	//Debug
+	//normalizedVertexNormal = vec3(0, 0, 1);
 
-	outColor += calcSpotLight(textureColor, reflectorPos, reflectorColor, reflectorDir, 
+	outColor = calcPointLight(textureColor, sunPos, sunLightDirTS, sunColor, sunLightExp);
-							  reflectorAngle, reflectorAngle + radians(10), reflectorLightExp);
+
+	outColor += calcSpotLight(textureColor, reflectorPos, reflectorLightDirTS, reflectorColor, reflectorLightExp);
+	
+	//Debug
+	//outColor = vec4(textureColor, 1);
 	
 }

cw 7/shaders/shader_earth.vert

@@ -3,20 +3,49 @@
 layout(location = 0) in vec3 vertexPosition;
 layout(location = 1) in vec3 vertexNormal;
 layout(location = 2) in vec2 vertexTexCoord;
+layout(location = 3) in vec3 vertexTangent;
+layout(location = 4) in vec3 vertexBitangent;
 
 uniform mat4 transformation;
 uniform mat4 modelMat;
 
-out vec3 vertexNormalOut;
+uniform vec3 cameraPos;
-out vec3 vertexPosOut;
+uniform vec3 sunPos;
+uniform vec3 reflectorPos;
+
+out vec3 vertexPosWld;
 out vec2 vertexTexCoordOut;
+out vec3 viewDirTS;
+out vec3 sunLightDirTS;
+out vec3 reflectorLightDirTS;
 
 void main()
 {
 	gl_Position = transformation * vec4(vertexPosition, 1.0);
-	vec4 worldNormal = modelMat * vec4(vertexNormal, 0.0);
+	vec3 normal = (modelMat * vec4(vertexNormal, 0.0)).xyz;
-	vertexNormalOut = worldNormal.xyz;
+	vec3 tangent = (modelMat * vec4(vertexTangent, 0.0)).xyz;
-	vertexPosOut = (modelMat * vec4(vertexPosition, 1.0)).xyz;
+	vec3 bitangent = (modelMat * vec4(vertexBitangent, 0.0)).xyz;
+	vertexPosWld = (modelMat * vec4(vertexPosition, 1.0)).xyz;
 	vertexTexCoordOut = vertexTexCoord;
 	vertexTexCoordOut.y = 1 - vertexTexCoord.y;// corrects inversion (bottom at top) of the earth
-}
+
+	mat3 TBN = transpose(mat3(tangent, bitangent, normal));
+	
+	//`lightPos - vertexPos` from tutorial is wrong?
+	//TODO why should we normalize here if we would normalize Tangent Space vectors later?
+	// and why do it here, mb fragment shader?
+	vec3 sunLightDir = normalize(vertexPosWld - sunPos);
+	vec3 reflectorLightDir = normalize(vertexPosWld - reflectorPos);
+	vec3 viewDir = normalize(cameraPos - vertexPosWld);
+	
+	// tangent space
+	viewDirTS = TBN * viewDir;
+	sunLightDirTS = TBN * sunLightDir;
+	reflectorLightDirTS = TBN * reflectorLightDir;
+
+	//TODO should normilize here or in the fragment shader?
+	viewDirTS = normalize(viewDirTS);
+	sunLightDirTS = normalize(sunLightDirTS);
+	reflectorLightDirTS = normalize(reflectorLightDirTS);
+}
+

cw 7/shaders/shader_proc_tex.frag

@@ -3,6 +3,8 @@
 uniform sampler2D colorTexture;
 uniform sampler2D rust;
 uniform sampler2D scratches;
+uniform sampler2D shipNormalSampler;
+uniform sampler2D rustNormalSampler;
 
 uniform vec3 sunPos;
 uniform vec3 sunColor;
@@ -18,69 +20,82 @@ uniform float reflectorAngle;
 uniform float reflectorLightExp;
 
 vec3 normalizedVertexNormal;
+vec3 scratchesColor;
 
-in vec3 vertexNormalOut;
+in vec3 vertexPosWld;
-in vec3 vertexPosOut;
 in vec2 vertexTexCoordOut;
+in vec3 viewDirTS;
+in vec3 sunLightDirTS;
+in vec3 reflectorLightDirTS;
 in vec3 vertexLocPos;
 
 out vec4 outColor;
 
-vec4 calcPointLight(vec3 fragColor, vec3 lightPos, vec3 lightColor, float lightExp) {
+vec4 calcPointLight(vec3 fragColor, vec3 lightPos, vec3 lightDirTS, vec3 lightColor, float lightExp) {
-	vec3 lightDir = normalize(vertexPosOut - lightPos);
+	float lightDistance = length(vertexPosWld - lightPos);
-	float lightDistance = length(vertexPosOut - lightPos);
 	vec3 newLightColor = lightColor / pow(lightDistance, 2);
 
-	float intensity = dot(normalizedVertexNormal, -lightDir);
+	float intensity = dot(normalizedVertexNormal, -lightDirTS);
 	intensity  = max(intensity, 0.0);
 	
-	vec3 viewDir = normalize(cameraPos - vertexPosOut);
+	vec3 reflectDir = reflect(lightDirTS, normalizedVertexNormal);
-	vec3 reflectDir = reflect(lightDir, normalizedVertexNormal);
+
-	
 	float glossPow = 8;
-	float specular = pow(max(dot(viewDir, reflectDir), 0.0), glossPow);
+	float specular = pow(max(dot(viewDirTS, reflectDir), 0.0), glossPow);
 
 	float diffuse = intensity;
 	vec3 resultColor = newLightColor * (fragColor * diffuse + specular );
 	return vec4(1 - exp(-resultColor  * lightExp), 1.0);
 }
 
-vec4 calcSpotLight(vec3 fragColor, vec3 lightPos, vec3 lightColor, vec3 lightDir, float lightExp) {
+vec4 calcSpotLight(vec3 fragColor, vec3 lightPos, vec3 lightDirTS, vec3 lightColor, float lightExp) {
-	vec3 reflectorLightDir = normalize(vertexPosOut - reflectorPos);
+	vec3 reflectorLightDir = normalize(vertexPosWld - lightPos);
 	float angleCos = dot(reflectorLightDir, reflectorDir);
 	float reflectorOutAngle = reflectorAngle + radians(10);
 	float epsilon = cos(reflectorAngle) - cos(reflectorOutAngle);
 	vec4 res = vec4(0, 0, 0, 1);
 	if (angleCos > cos(reflectorOutAngle)) {
 		float intensity = clamp((angleCos - cos(reflectorOutAngle)) / epsilon, 0.0, 1.0);  
-		res = calcPointLight(fragColor, reflectorPos, reflectorColor, reflectorLightExp  * intensity);
+		res = calcPointLight(fragColor, lightPos, lightDirTS, lightColor, lightExp  * intensity);
 	}
 	return res;
 }
 
-
+vec3 calcShipColor() {
-void main()
-{
 	vec3 shipColor = texture2D(colorTexture, vertexTexCoordOut).rgb;
 	vec3 rustColor = texture2D(rust, vertexTexCoordOut).rgb;
-	vec3 scratchesColor = texture2D(scratches, vertexTexCoordOut).rgb;
+	vec3 textureColor = mix(rustColor, shipColor, scratchesColor.r);
-	vec3 textureColor = mix(rustColor, shipColor, scratchesColor .r);
 
 	if (sin(vertexLocPos.y * vertexLocPos.x * vertexLocPos.z) > 0) {
 		textureColor = vec3(1, 0, 0);
 	}
-	
-	normalizedVertexNormal = normalize(vertexNormalOut);
 
-	outColor = calcPointLight(textureColor, sunPos, sunColor, sunLightExp);
+	return textureColor;
-
+}
-	vec3 reflectorLightDir = normalize(vertexPosOut - reflectorPos);
+
-	float angleCos = dot(reflectorLightDir, reflectorDir);
+vec3 calcShipNormal() {
-	float reflectorOutAngle = reflectorAngle + radians(10);
+	vec3 shipNormal = texture2D(shipNormalSampler, vertexTexCoordOut).xyz;
-	float epsilon = cos(reflectorAngle) - cos(reflectorOutAngle);
+	shipNormal = 2 * shipNormal - 1;//since sampler has values from [0, 1], but we want [-1, 1]
-	if (angleCos > cos(reflectorOutAngle)) {
+	vec3 rustNormal = texture2D(rustNormalSampler, vertexTexCoordOut).xyz;
-		float intensity = clamp((angleCos - cos(reflectorOutAngle)) / epsilon, 0.0, 1.0);  
+	rustNormal = 2 * rustNormal - 1;//since sampler has values from [0, 1], but we want [-1, 1]
-		outColor += calcSpotLight(textureColor, reflectorPos, reflectorColor, reflectorLightDir, reflectorLightExp  * intensity);
+	//normalize to avoid potential precision problems in sampler texture
-	}
+	return normalize(mix(rustNormal, shipNormal, scratchesColor.r));
+}
+
+void main()
+{
+	scratchesColor = texture2D(scratches, vertexTexCoordOut).rgb;
+	vec3 textureColor = calcShipColor();
+	
+	normalizedVertexNormal = calcShipNormal();
+	//Debug
+	//normalizedVertexNormal = vec3(0, 0, 1);
+	
+	outColor = calcPointLight(textureColor, sunPos, sunLightDirTS, sunColor, sunLightExp);
+
+	outColor += calcSpotLight(textureColor, reflectorPos, reflectorLightDirTS, reflectorColor, reflectorLightExp);
+	
+	//Debug
+	//outColor = vec4(textureColor, 1);
 }
 

cw 7/shaders/shader_proc_tex.vert

@@ -3,21 +3,50 @@
 layout(location = 0) in vec3 vertexPosition;
 layout(location = 1) in vec3 vertexNormal;
 layout(location = 2) in vec2 vertexTexCoord;
+layout(location = 3) in vec3 vertexTangent;
+layout(location = 4) in vec3 vertexBitangent;
 
 uniform mat4 transformation;
 uniform mat4 modelMat;
 
-out vec3 vertexNormalOut;
+uniform vec3 cameraPos;
-out vec3 vertexPosOut;
+uniform vec3 sunPos;
-out vec2 vertexTexCoordOut;
+uniform vec3 reflectorPos;
+
+out vec3 vertexPosWld;
 out vec3 vertexLocPos;
+out vec2 vertexTexCoordOut;
+out vec3 viewDirTS;
+out vec3 sunLightDirTS;
+out vec3 reflectorLightDirTS;
 
 void main()
 {
 	gl_Position = transformation * vec4(vertexPosition, 1.0);
-	vec4 worldNormal = modelMat * vec4(vertexNormal, 0.0);
+	vec3 normal = (modelMat * vec4(vertexNormal, 0.0)).xyz;
-	vertexNormalOut = worldNormal.xyz;
+	vec3 tangent = (modelMat * vec4(vertexTangent, 0.0)).xyz;
-	vertexPosOut = (modelMat * vec4(vertexPosition, 1.0)).xyz;
+	vec3 bitangent = (modelMat * vec4(vertexBitangent, 0.0)).xyz;
+	vertexPosWld = (modelMat * vec4(vertexPosition, 1.0)).xyz;
 	vertexTexCoordOut = vertexTexCoord;
+
 	vertexLocPos = vertexPosition;
+
+	mat3 TBN = transpose(mat3(tangent, bitangent, normal));
+	
+	//`lightPos - vertexPos` from tutorial is wrong?
+	//TODO why should we normalize here if we would normalize Tangent Space vectors later?
+	// and why do it here, mb fragment shader?
+	vec3 sunLightDir = normalize(vertexPosWld - sunPos);
+	vec3 reflectorLightDir = normalize(vertexPosWld - reflectorPos);
+	vec3 viewDir = normalize(cameraPos - vertexPosWld);
+	
+	// tangent space
+	viewDirTS = TBN * viewDir;
+	sunLightDirTS = TBN * sunLightDir;
+	reflectorLightDirTS = TBN * reflectorLightDir;
+
+	//TODO should normilize here or in the fragment shader?
+	viewDirTS = normalize(viewDirTS);
+	sunLightDirTS = normalize(sunLightDirTS);
+	reflectorLightDirTS = normalize(reflectorLightDirTS);
 }

cw 7/src/ex_7_1.hpp

@@ -25,8 +25,10 @@ namespace texture {
 	GLuint grid;
 
 	GLuint earthNormal;
+	GLuint moonNormal;
 	GLuint asteroidNormal;
 	GLuint shipNormal;
+	GLuint rustNormal;
 
 	GLuint cubemap;
 }
@@ -143,12 +145,15 @@ void drawObjectColor(GLuint program, Core::RenderContext& context, glm::mat4 mod
 }
 
 void drawObjectProc(Core::RenderContext& context, glm::mat4 modelMatrix, glm::vec3 color) {
-	program = programProcTex;
+	GLuint program = programProcTex;
-
 	glUseProgram(program);
+
 	Core::SetActiveTexture(texture::ship, "colorTexture", program, 0);
 	Core::SetActiveTexture(texture::rust, "rust", program, 1);
 	Core::SetActiveTexture(texture::scratches, "scratches", program, 2);
+	Core::SetActiveTexture(texture::shipNormal, "shipNormalSampler", program, 3);
+	Core::SetActiveTexture(texture::rustNormal, "rustNormalSampler", program, 4);
+
 	glm::mat4 viewProjectionMatrix = createPerspectiveMatrix() * createCameraMatrix();
 	glm::mat4 transformation = viewProjectionMatrix * modelMatrix;
 	glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, (float*)&transformation);
@@ -173,9 +178,11 @@ void drawObjectProc(Core::RenderContext& context, glm::mat4 modelMatrix, glm::ve
 
 }
 
-void drawObjectTexture(GLuint program, Core::RenderContext& context, glm::mat4 modelMatrix, GLuint textureId) {
+void drawObjectTexture(GLuint program, Core::RenderContext& context, glm::mat4 modelMatrix, 
+					   GLuint textureId, GLuint normalsTextureId) {
 	glUseProgram(program);
 	Core::SetActiveTexture(textureId, "colorTexture", program, 0);
+	Core::SetActiveTexture(normalsTextureId, "normalSampler", program, 1);
 	glm::mat4 viewProjectionMatrix = createPerspectiveMatrix() * createCameraMatrix();
 	glm::mat4 transformation = viewProjectionMatrix * modelMatrix;
 	glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, (float*)&transformation);
@@ -205,6 +212,7 @@ void drawEarth(Core::RenderContext& context, glm::mat4 modelMatrix) {
 	glUseProgram(program);
 	Core::SetActiveTexture(texture::earth, "colorTexture", program, 0);
 	Core::SetActiveTexture(texture::clouds, "clouds", program, 1);
+	Core::SetActiveTexture(texture::earthNormal, "normalSampler", program, 2);
 	glm::mat4 viewProjectionMatrix = createPerspectiveMatrix() * createCameraMatrix();
 	glm::mat4 transformation = viewProjectionMatrix * modelMatrix;
 	glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, (float*)&transformation);
@@ -266,7 +274,7 @@ void renderScene(GLFWwindow* window)
 
 	drawObjectTexture(programTex, sphereContext,
 		glm::eulerAngleY(time / 3) * glm::translate(glm::vec3(4.f, 0, 0)) * glm::eulerAngleY(time) * glm::translate(glm::vec3(1.f, 0, 0)) * glm::scale(glm::vec3(0.1f)),
-		texture::grid);
+		texture::grid, texture::moonNormal);
 
 	glm::vec3 spaceshipSide = glm::normalize(glm::cross(spaceshipDir, glm::vec3(0.f, 1.f, 0.f)));
 	glm::vec3 spaceshipUp = glm::normalize(glm::cross(spaceshipSide, spaceshipDir));
@@ -370,8 +378,10 @@ void init(GLFWwindow* window)
 	texture::grid = Core::LoadTexture("./textures/grid_color.png");
 
 	texture::earthNormal = Core::LoadTexture("./textures/earth_normalmap.png");
+	texture::moonNormal = Core::LoadTexture("./textures/moon_normal.jpg");
 	texture::asteroidNormal = Core::LoadTexture("./textures/rust_normal.jpg");
 	texture::shipNormal = Core::LoadTexture("./textures/spaceship_normalmap.jpg");
+	texture::rustNormal = Core::LoadTexture("./textures/rust_normal.jpg");
 
 	init_cubemap();
 }