X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fshader.cpp;h=b2ccb8b6dc7fcfbc98c44028b9c97263d562b274;hb=e53a0e2e711a7d8bd9b0ddacd1360aa14370643f;hp=43b3910096789bb4aaece8133abd8ac2b42e75a4;hpb=753be639d7d04f9f7415db9fc2721485c531f0a1;p=blank.git

diff --git a/src/shader.cpp b/src/shader.cpp
index 43b3910..b2ccb8b 100644
--- a/src/shader.cpp
+++ b/src/shader.cpp
@@ -42,27 +42,27 @@ Shader::~Shader() {
 	}
 }
 
-Shader::Shader(Shader &&other)
+Shader::Shader(Shader &&other) noexcept
 : handle(other.handle) {
 	other.handle = 0;
 }
 
-Shader &Shader::operator =(Shader &&other) {
+Shader &Shader::operator =(Shader &&other) noexcept {
 	std::swap(handle, other.handle);
 	return *this;
 }
 
 
-void Shader::Source(const GLchar *src) {
+void Shader::Source(const GLchar *src) noexcept {
 	const GLchar* src_arr[] = { src };
 	glShaderSource(handle, 1, src_arr, nullptr);
 }
 
-void Shader::Compile() {
+void Shader::Compile() noexcept {
 	glCompileShader(handle);
 }
 
-bool Shader::Compiled() const {
+bool Shader::Compiled() const noexcept {
 	GLint compiled = GL_FALSE;
 	glGetShaderiv(handle, GL_COMPILE_STATUS, &compiled);
 	return compiled == GL_TRUE;
@@ -77,7 +77,7 @@ void Shader::Log(std::ostream &out) const {
 }
 
 
-void Shader::AttachToProgram(GLuint id) const {
+void Shader::AttachToProgram(GLuint id) const noexcept {
 	glAttachShader(id, handle);
 }
 
@@ -109,15 +109,15 @@ const Shader &Program::LoadShader(GLenum type, const GLchar *src) {
 	return shader;
 }
 
-void Program::Attach(Shader &shader) {
+void Program::Attach(Shader &shader) noexcept {
 	shader.AttachToProgram(handle);
 }
 
-void Program::Link() {
+void Program::Link() noexcept {
 	glLinkProgram(handle);
 }
 
-bool Program::Linked() const {
+bool Program::Linked() const noexcept {
 	GLint linked = GL_FALSE;
 	glGetProgramiv(handle, GL_LINK_STATUS, &linked);
 	return linked == GL_TRUE;
@@ -132,7 +132,11 @@ void Program::Log(std::ostream &out) const {
 }
 
 
-GLint Program::UniformLocation(const GLchar *name) const {
+GLint Program::AttributeLocation(const GLchar *name) const noexcept {
+	return glGetAttribLocation(handle, name);
+}
+
+GLint Program::UniformLocation(const GLchar *name) const noexcept {
 	return glGetUniformLocation(handle, name);
 }
 
@@ -143,9 +147,11 @@ DirectionalLighting::DirectionalLighting()
 , light_color(0.9f, 0.9f, 0.9f)
 , vp(1.0f)
 , m_handle(0)
+, mv_handle(0)
 , mvp_handle(0)
 , light_direction_handle(0)
-, light_color_handle(0) {
+, light_color_handle(0)
+, fog_density_handle(0) {
 	program.LoadShader(
 		GL_VERTEX_SHADER,
 		"#version 330 core\n"
@@ -153,11 +159,14 @@ DirectionalLighting::DirectionalLighting()
 		"layout(location = 1) in vec3 vtx_color;\n"
 		"layout(location = 2) in vec3 vtx_normal;\n"
 		"uniform mat4 M;\n"
+		"uniform mat4 MV;\n"
 		"uniform mat4 MVP;\n"
 		"out vec3 frag_color;\n"
+		"out vec3 vtx_viewspace;\n"
 		"out vec3 normal;\n"
 		"void main() {\n"
 			"gl_Position = MVP * vec4(vtx_position, 1);\n"
+			"vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 			"normal = (M * vec4(vtx_normal, 0)).xyz;\n"
 			"frag_color = vtx_color;\n"
 		"}\n"
@@ -166,16 +175,23 @@ DirectionalLighting::DirectionalLighting()
 		GL_FRAGMENT_SHADER,
 		"#version 330 core\n"
 		"in vec3 frag_color;\n"
+		"in vec3 vtx_viewspace;\n"
 		"in vec3 normal;\n"
 		"uniform vec3 light_direction;\n"
 		"uniform vec3 light_color;\n"
+		"uniform float fog_density;\n"
 		"out vec3 color;\n"
 		"void main() {\n"
 			"vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
+			// this should be the same as the clear color, otherwise looks really weird
+			"vec3 fog_color = vec3(0, 0, 0);\n"
+			"float e = 2.718281828;\n"
 			"vec3 n = normalize(normal);\n"
 			"vec3 l = normalize(light_direction);\n"
 			"float cos_theta = clamp(dot(n, l), 0, 1);\n"
-			"color = ambient + frag_color * light_color * cos_theta;\n"
+			"vec3 reflect_color = ambient + frag_color * light_color * cos_theta;\n"
+			"float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
+			"color = mix(fog_color, reflect_color, value);\n"
 		"}\n"
 	);
 	program.Link();
@@ -185,13 +201,15 @@ DirectionalLighting::DirectionalLighting()
 	}
 
 	m_handle = program.UniformLocation("M");
+	mv_handle = program.UniformLocation("MV");
 	mvp_handle = program.UniformLocation("MVP");
 	light_direction_handle = program.UniformLocation("light_direction");
 	light_color_handle = program.UniformLocation("light_color");
+	fog_density_handle = program.UniformLocation("fog_density");
 }
 
 
-void DirectionalLighting::Activate() {
+void DirectionalLighting::Activate() noexcept {
 	GLContext::EnableDepthTest();
 	GLContext::EnableBackfaceCulling();
 	program.Use();
@@ -200,34 +218,136 @@ void DirectionalLighting::Activate() {
 	glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 }
 
-void DirectionalLighting::SetM(const glm::mat4 &m) {
+void DirectionalLighting::SetM(const glm::mat4 &m) noexcept {
+	glm::mat4 mv(view * m);
 	glm::mat4 mvp(vp * m);
 	glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
+	glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 	glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 }
 
-void DirectionalLighting::SetLightDirection(const glm::vec3 &dir) {
+void DirectionalLighting::SetLightDirection(const glm::vec3 &dir) noexcept {
 	light_direction = -dir;
 	glUniform3f(light_direction_handle, light_direction.x, light_direction.y, light_direction.z);
 }
 
-void DirectionalLighting::SetProjection(const glm::mat4 &p) {
+void DirectionalLighting::SetFogDensity(float f) noexcept {
+	fog_density = f;
+	glUniform1f(fog_density_handle, fog_density);
+}
+
+void DirectionalLighting::SetProjection(const glm::mat4 &p) noexcept {
+	projection = p;
+	vp = p * view;
+}
+
+void DirectionalLighting::SetView(const glm::mat4 &v) noexcept {
+	view = v;
+	vp = projection * v;
+}
+
+void DirectionalLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
+	projection = p;
+	view = v;
+	vp = p * v;
+}
+
+void DirectionalLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
+	SetVP(v, p);
+	SetM(m);
+}
+
+
+BlockLighting::BlockLighting()
+: program()
+, vp(1.0f)
+, mv_handle(0)
+, mvp_handle(0)
+, fog_density_handle(0) {
+	program.LoadShader(
+		GL_VERTEX_SHADER,
+		"#version 330 core\n"
+		"layout(location = 0) in vec3 vtx_position;\n"
+		"layout(location = 1) in vec3 vtx_color;\n"
+		"layout(location = 2) in float vtx_light;\n"
+		"uniform mat4 MV;\n"
+		"uniform mat4 MVP;\n"
+		"out vec3 frag_color;\n"
+		"out vec3 vtx_viewspace;\n"
+		"out float frag_light;\n"
+		"void main() {\n"
+			"gl_Position = MVP * vec4(vtx_position, 1);\n"
+			"frag_color = vtx_color;\n"
+			"vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
+			"frag_light = vtx_light;\n"
+		"}\n"
+	);
+	program.LoadShader(
+		GL_FRAGMENT_SHADER,
+		"#version 330 core\n"
+		"in vec3 frag_color;\n"
+		"in vec3 vtx_viewspace;\n"
+		"in float frag_light;\n"
+		"uniform float fog_density;\n"
+		"out vec3 color;\n"
+		"void main() {\n"
+			"vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
+			"float light_power = clamp(pow(0.8, 15 - frag_light), 0, 1);\n"
+			"vec3 fog_color = vec3(0, 0, 0);\n"
+			"float e = 2.718281828;\n"
+			//"vec3 reflect_color = ambient + frag_color * light_power;\n"
+			"vec3 reflect_color = frag_color * light_power;\n"
+			"float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
+			"color = mix(fog_color, reflect_color, value);\n"
+		"}\n"
+	);
+	program.Link();
+	if (!program.Linked()) {
+		program.Log(std::cerr);
+		throw std::runtime_error("link program");
+	}
+
+	mv_handle = program.UniformLocation("MV");
+	mvp_handle = program.UniformLocation("MVP");
+	fog_density_handle = program.UniformLocation("fog_density");
+}
+
+
+void BlockLighting::Activate() noexcept {
+	GLContext::EnableDepthTest();
+	GLContext::EnableBackfaceCulling();
+	program.Use();
+}
+
+void BlockLighting::SetM(const glm::mat4 &m) noexcept {
+	glm::mat4 mv(view * m);
+	glm::mat4 mvp(vp * m);
+	glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
+	glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
+}
+
+void BlockLighting::SetFogDensity(float f) noexcept {
+	fog_density = f;
+	glUniform1f(fog_density_handle, fog_density);
+}
+
+void BlockLighting::SetProjection(const glm::mat4 &p) noexcept {
 	projection = p;
 	vp = p * view;
 }
 
-void DirectionalLighting::SetView(const glm::mat4 &v) {
+void BlockLighting::SetView(const glm::mat4 &v) noexcept {
 	view = v;
 	vp = projection * v;
 }
 
-void DirectionalLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) {
+void BlockLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 	projection = p;
 	view = v;
 	vp = p * v;
 }
 
-void DirectionalLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) {
+void BlockLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 	SetVP(v, p);
 	SetM(m);
 }