Particle coś

2021-02-01 00:26:43 +01:00 · 2021-02-01 00:26:43 +01:00 · 12f2044980
commit 12f2044980
parent 042572f519
7 changed files with 342 additions and 20 deletions
--- a/grk-project.vcxproj
+++ b/grk-project.vcxproj
@ -17,6 +17,8 @@
    <None Include="shaders\shader_blur.vert" />
    <None Include="shaders\shader_color.frag" />
    <None Include="shaders\shader_color.vert" />
+    <None Include="shaders\shader_particle.frag" />
+    <None Include="shaders\shader_particle.vert" />
    <None Include="shaders\shader_skybox.frag" />
    <None Include="shaders\shader_skybox.vert" />
    <None Include="shaders\shader_sun.frag" />
@ -49,7 +51,7 @@
    <ProjectGuid>{1B448102-E76C-4347-BDC7-40D02A567DB6}</ProjectGuid>
    <Keyword>Win32Proj</Keyword>
    <RootNamespace>grk-cw9</RootNamespace>
-    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
    <ProjectName>grk-project</ProjectName>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
@ -57,14 +59,14 @@
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v141</PlatformToolset>
+    <PlatformToolset>v142</PlatformToolset>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>Unicode</CharacterSet>
-    <PlatformToolset>v141</PlatformToolset>
+    <PlatformToolset>v142</PlatformToolset>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
--- a/grk-project.vcxproj.filters
+++ b/grk-project.vcxproj.filters
@ -54,6 +54,12 @@
    <None Include="shaders\shader_sun.vert">
      <Filter>Shader Files</Filter>
    </None>
+    <None Include="shaders\shader_particle.frag">
+      <Filter>Shader Files</Filter>
+    </None>
+    <None Include="shaders\shader_particle.vert">
+      <Filter>Shader Files</Filter>
+    </None>
  </ItemGroup>
  <ItemGroup>
    <ClCompile Include="src\Box.cpp">
--- a/shader_particle.frag
+++ b/shader_particle.frag
@ -0,0 +1,14 @@
+#version 330 core
+
+in vec2 UV;
+in vec4 ParticleColor;
+
+out vec4 color;
+
+uniform sampler2D sprite;
+
+void main()
+{
+    	color = texture( sprite, UV ) * ParticleColor;
+
+}  
--- a/shader_particle.vert
+++ b/shader_particle.vert
@ -0,0 +1,29 @@
+#version 330 core
+layout(location = 0) in vec3 squareVertices;
+layout(location = 1) in vec4 xyzs; 
+layout(location = 2) in vec4 color;
+
+out vec2 UV;
+out vec4 ParticleColor;
+
+uniform vec3 CameraRight_worldspace;
+uniform vec3 CameraUp_worldspace;
+uniform mat4 VP;
+
+void main()
+{
+   float particleSize = xyzs.w; // because we encoded it this way.
+	vec3 particleCenter_wordspace = xyzs.xyz;
+	
+	vec3 vertexPosition_worldspace = 
+		particleCenter_wordspace
+		+ CameraRight_worldspace * squareVertices.x * particleSize
+		+ CameraUp_worldspace * squareVertices.y * particleSize;
+
+	// Output position of the vertex
+	gl_Position = VP * vec4(vertexPosition_worldspace, 1.0f);
+
+	// UV of the vertex. No special space for this one.
+	UV = squareVertices.xy + vec2(0.5, 0.5);
+	ParticleColor = color;
+}
--- a/shaders/shader_particle.frag
+++ b/shaders/shader_particle.frag
@ -0,0 +1,14 @@
+#version 330 core
+
+in vec2 UV;
+in vec4 ParticleColor;
+
+out vec4 color;
+
+uniform sampler2D sprite;
+
+void main()
+{
+    	color = texture( sprite, UV ) * ParticleColor;
+
+}  
--- a/shaders/shader_particle.vert
+++ b/shaders/shader_particle.vert
@ -0,0 +1,29 @@
+#version 330 core
+layout(location = 0) in vec3 squareVertices;
+layout(location = 1) in vec4 xyzs; 
+layout(location = 2) in vec4 color;
+
+out vec2 UV;
+out vec4 ParticleColor;
+
+uniform vec3 CameraRight_worldspace;
+uniform vec3 CameraUp_worldspace;
+uniform mat4 VP;
+
+void main()
+{
+   float particleSize = xyzs.w; // because we encoded it this way.
+	vec3 particleCenter_wordspace = xyzs.xyz;
+	
+	vec3 vertexPosition_worldspace = 
+		particleCenter_wordspace
+		+ CameraRight_worldspace * squareVertices.x * particleSize
+		+ CameraUp_worldspace * squareVertices.y * particleSize;
+
+	// Output position of the vertex
+	gl_Position = VP * vec4(vertexPosition_worldspace, 1.0f);
+
+	// UV of the vertex. No special space for this one.
+	UV = squareVertices.xy + vec2(0.5, 0.5);
+	ParticleColor = color;
+}
--- a/src/main.cpp
+++ b/src/main.cpp
@ -29,12 +29,24 @@ GLuint programSkybox;
 GLuint programSun;
 GLuint programBlur;
 GLuint programBloom;
+GLuint programParticle;
+GLuint VertexArrayID;

 unsigned int pingpongFBO[2];
 unsigned int pingpongColorbuffers[2];
 unsigned int FBO;
 unsigned int colorBuffers[2];
-
+//particlepart
+double lastTime;
+static GLfloat* g_particule_position_size_data;
+static GLubyte* g_particule_color_data;
+GLuint particle_vertex_buffer;
+GLuint particles_position_buffer;
+GLuint particles_color_buffer;
+GLuint CameraRight_worldspace_ID;
+GLuint CameraUp_worldspace_ID;
+GLuint ViewProjMatrixID;
+GLuint TextureParticle;

 Core::Shader_Loader shaderLoader;

@ -48,6 +60,7 @@ GLuint earthTexture;
 GLuint moonTexture;
 GLuint skyboxTexture;
 GLuint shipTexture;
+GLuint particleTexture;
 obj::Model sphereModel;
 obj::Model cubeModel;
 obj::Model shipModel;
@ -71,8 +84,47 @@ glm::mat4 cameraMatrix, perspectiveMatrix;

 glm::vec3 sunPos = glm::vec3(10.0f, 0.0f, -5.0f);
 glm::vec3 sunPos2 = glm::vec3(25.0f, -1.0f, 10.0f);
+//particlepart
+struct Particle {
+	glm::vec3 pos, speed;
+	unsigned char r, g, b, a; // Color
+	float size, angle, weight;
+	float life; // Remaining life of the particle. if <0 : dead and unused.
+	float cameradistance; // *Squared* distance to the camera. if dead : -1.0f

+	bool operator<(const Particle& that) const {
+		return this->cameradistance > that.cameradistance;
+	}
+};

+const int MaxParticles = 1000;
+Particle ParticlesContainer[MaxParticles];
+int LastUsedParticle = 0;
+
+void SortParticles() {
+	std::sort(&ParticlesContainer[0], &ParticlesContainer[MaxParticles]);
+}
+
+int FindUnusedParticle() {
+
+	for (int i = LastUsedParticle; i < MaxParticles; i++) {
+		if (ParticlesContainer[i].life < 0) {
+			LastUsedParticle = i;
+			return i;
+		}
+	}
+
+	for (int i = 0; i < LastUsedParticle; i++) {
+		if (ParticlesContainer[i].life < 0) {
+			LastUsedParticle = i;
+			return i;
+		}
+	}
+
+	return 0; // All particles are taken, override the first one
+}
+
+//Light
 struct Light {
 	glm::vec3 position;
 	glm::vec3 color;
@ -167,7 +219,7 @@ glm::mat4 createCameraMatrix()
 	cameraDir = glm::vec3(cosf(cameraAngle), 0.0f, sinf(cameraAngle));
 	glm::vec3 up = glm::vec3(0, 1, 0);

-	cameraSide = glm::cross(cameraDir,up);
+	cameraSide = glm::cross(cameraDir, up);

 	return Core::createViewMatrix(cameraPos, cameraDir, up);
 }
@ -218,7 +270,7 @@ unsigned int loadCubemap(std::vector<std::string> faces)
 	int width, height, nrChannels;
 	for (unsigned int i = 0; i < faces.size(); i++)
 	{
-		unsigned char *data = stbi_load(faces[i].c_str(), &width, &height, &nrChannels, 0);
+		unsigned char* data = stbi_load(faces[i].c_str(), &width, &height, &nrChannels, 0);
 		if (data)
 		{
 			glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,
@ -325,7 +377,7 @@ void renderScene()
 	lights[0].position = sunPos;
 	lights[1].position = sunPos2;

-	glm::mat4 engineLeft = glm::translate(shipModelMatrix, glm::vec3(700,0,-1500));
+	glm::mat4 engineLeft = glm::translate(shipModelMatrix, glm::vec3(700, 0, -1500));
 	lights[2].position = glm::vec3(engineLeft[3][0], engineLeft[3][1], engineLeft[3][2]);

 	glm::mat4 engineRight = glm::translate(shipModelMatrix, glm::vec3(-700, 0, -1500));
@ -347,9 +399,9 @@ void renderScene()
 	drawFromAssimpModel(programTex, crewmate, crewmateModelMatrix, glm::vec3(1));

 	//rysowanie Ziemi z ksiezycem
-	glm::mat4 earth = drawPlanet(time / 5.0f, sunPos*glm::vec3(1.5f,1,1), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(-10.5f, 0.0f, -10.5f), glm::vec3(0.5f, 0.5f, 0.5f));
-	glm::mat4 moon = drawMoon(earth, time/2.0f, glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0, 1, 1), glm::vec3(1.5f, 1.0f, 1.0f), glm::vec3(0.3f, 0.3f, 0.3f));
-	earth = glm::rotate(earth, time/3.0f, glm::vec3(0.0f, 0.0f, 1.0f));
+	glm::mat4 earth = drawPlanet(time / 5.0f, sunPos * glm::vec3(1.5f, 1, 1), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(-10.5f, 0.0f, -10.5f), glm::vec3(0.5f, 0.5f, 0.5f));
+	glm::mat4 moon = drawMoon(earth, time / 2.0f, glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0, 1, 1), glm::vec3(1.5f, 1.0f, 1.0f), glm::vec3(0.3f, 0.3f, 0.3f));
+	earth = glm::rotate(earth, time / 3.0f, glm::vec3(0.0f, 0.0f, 1.0f));
 	drawObjectTexture(programTex, sphereContext, earth, glm::vec3(0.8f, 0.8f, 0.8f), earthTexture);
 	drawObjectTexture(programTex, sphereContext, moon, glm::vec3(0.9f, 1.0f, 0.9f), moonTexture);

@ -393,8 +445,143 @@ void renderScene()
 	}


-	glUseProgram(0);
 	glutSwapBuffers();
+	//particlepart
+	glUseProgram(programParticle);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	double currentTime = glutGet(GLUT_ELAPSED_TIME) / 1000.f;
+	double delta = currentTime - lastTime;
+	lastTime = currentTime;
+	glm::mat4 ProjectionMatrix = perspectiveMatrix * glm::mat4(glm::mat3(cameraMatrix));
+	glm::mat4 ViewMatrix = cameraMatrix;
+	glm::vec3 CameraPosition(glm::inverse(ViewMatrix)[3]);
+	glm::mat4 ViewProjectionMatrix = ProjectionMatrix * ViewMatrix;
+
+	int newparticles = (int)(delta * 10000.0);
+	if (newparticles > (int)(0.016f * 10000.0))
+		newparticles = (int)(0.016f * 10000.0);
+
+	for (int i = 0; i < newparticles; i++) {
+		int particleIndex = FindUnusedParticle();
+		ParticlesContainer[particleIndex].life = 100.0f;
+		ParticlesContainer[particleIndex].pos = glm::vec3(0, 0, 0.0f);
+
+		float spread = 1.5f;
+		glm::vec3 maindir = glm::vec3(0.0f, 0.0f, 0.0f);
+		glm::vec3 randomdir = glm::vec3(
+			(rand() % 2000 - 1000.0f) / 1000.0f,
+			(rand() % 2000 - 1000.0f) / 1000.0f,
+			(rand() % 2000 - 1000.0f) / 1000.0f
+		);
+
+		ParticlesContainer[particleIndex].speed = maindir + randomdir * spread;
+
+
+		// Very bad way to generate a random color
+		ParticlesContainer[particleIndex].r = rand() % 256;
+		ParticlesContainer[particleIndex].g = rand() % 256;
+		ParticlesContainer[particleIndex].b = rand() % 256;
+		ParticlesContainer[particleIndex].a = (rand() % 256) / 3;
+
+		ParticlesContainer[particleIndex].size = (rand() % 1000) / 2000.0f + 0.1f;
+
+	}
+	// Simulate all particles
+	int ParticlesCount = 0;
+	for (int i = 0; i < MaxParticles; i++) {
+
+		Particle& p = ParticlesContainer[i]; // shortcut
+
+		if (p.life > 0.0f) {
+
+			// Decrease life
+			p.life -= delta;
+			if (p.life > 0.0f) {
+
+				// Simulate simple physics : gravity only, no collisions
+				p.speed += glm::vec3(0.0f, -9.81f, 0.0f) * (float)delta * 0.5f;
+				p.pos += p.speed * (float)delta;
+				p.cameradistance = glm::length2(p.pos - cameraPos);
+				//ParticlesContainer[i].pos += glm::vec3(0.0f,10.0f, 0.0f) * (float)delta;
+
+				// Fill the GPU buffer
+				g_particule_position_size_data[4 * ParticlesCount + 0] = p.pos.x;
+				g_particule_position_size_data[4 * ParticlesCount + 1] = p.pos.y;
+				g_particule_position_size_data[4 * ParticlesCount + 2] = p.pos.z;
+
+				g_particule_position_size_data[4 * ParticlesCount + 3] = p.size;
+
+				g_particule_color_data[4 * ParticlesCount + 0] = p.r;
+				g_particule_color_data[4 * ParticlesCount + 1] = p.g;
+				g_particule_color_data[4 * ParticlesCount + 2] = p.b;
+				g_particule_color_data[4 * ParticlesCount + 3] = p.a;
+
+			}
+			else {
+				// Particles that just died will be put at the end of the buffer in SortParticles();
+				p.cameradistance = -1.0f;
+			}
+
+			ParticlesCount++;
+
+		}
+	}
+
+	SortParticles();
+	glBindBuffer(GL_ARRAY_BUFFER, particles_position_buffer);
+	glBufferData(GL_ARRAY_BUFFER, MaxParticles * 4 * sizeof(GLfloat), NULL, GL_STREAM_DRAW); // Buffer orphaning, a common way to improve streaming perf. See above link for details.
+	glBufferSubData(GL_ARRAY_BUFFER, 0, ParticlesCount * sizeof(GLfloat) * 4, g_particule_position_size_data);
+
+	glBindBuffer(GL_ARRAY_BUFFER, particles_color_buffer);
+	glBufferData(GL_ARRAY_BUFFER, MaxParticles * 4 * sizeof(GLubyte), NULL, GL_STREAM_DRAW); // Buffer orphaning, a common way to improve streaming perf. See above link for details.
+	glBufferSubData(GL_ARRAY_BUFFER, 0, ParticlesCount * sizeof(GLubyte) * 4, g_particule_color_data);
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, particleTexture);
+	glUniform1i(TextureParticle, 0);
+	glUniform3f(CameraRight_worldspace_ID, ViewMatrix[0][0], ViewMatrix[1][0], ViewMatrix[2][0]);
+	glUniform3f(CameraUp_worldspace_ID, ViewMatrix[0][1], ViewMatrix[1][1], ViewMatrix[2][1]);
+
+	glUniformMatrix4fv(ViewProjMatrixID, 1, GL_FALSE, &ViewMatrix[0][0]);
+
+	glEnableVertexAttribArray(0);
+	glBindBuffer(GL_ARRAY_BUFFER, particle_vertex_buffer);
+	glVertexAttribPointer(
+		0,                  // attribute. No particular reason for 0, but must match the layout in the shader.
+		3,                  // size
+		GL_FLOAT,           // type
+		GL_FALSE,           // normalized?
+		0,                  // stride
+		(void*)0            // array buffer offset
+	);
+	glEnableVertexAttribArray(1);
+	glBindBuffer(GL_ARRAY_BUFFER, particles_position_buffer);
+	glVertexAttribPointer(
+		1,                                // attribute. No particular reason for 1, but must match the layout in the shader.
+		4,                                // size : x + y + z + size => 4
+		GL_FLOAT,                         // type
+		GL_FALSE,                         // normalized?
+		0,                                // stride
+		(void*)0                          // array buffer offset
+	);
+	glEnableVertexAttribArray(2);
+	glBindBuffer(GL_ARRAY_BUFFER, particles_color_buffer);
+	glVertexAttribPointer(
+		2,                                // attribute. No particular reason for 1, but must match the layout in the shader.
+		4,                                // size : r + g + b + a => 4
+		GL_UNSIGNED_BYTE,                 // type
+		GL_TRUE,                          // normalized?    *** YES, this means that the unsigned char[4] will be accessible with a vec4 (floats) in the shader ***
+		0,                                // stride
+		(void*)0                          // array buffer offset
+	);
+	glVertexAttribDivisor(0, 0); // particles vertices : always reuse the same 4 vertices -> 0
+	glVertexAttribDivisor(1, 1); // positions : one per quad (its center)                 -> 1
+	glVertexAttribDivisor(2, 1); // color : one per quad                                  -> 1
+	glDrawArraysInstanced(GL_TRIANGLE_STRIP, 0, 4, ParticlesCount);
+
+	glDisableVertexAttribArray(0);
+	glDisableVertexAttribArray(1);
+	glDisableVertexAttribArray(2);
 }

 void init()
@ -405,6 +592,7 @@ void init()
 	programSun = shaderLoader.CreateProgram("shaders/shader_sun.vert", "shaders/shader_sun.frag");
 	programBlur = shaderLoader.CreateProgram("shaders/shader_blur.vert", "shaders/shader_blur.frag");
 	programBloom = shaderLoader.CreateProgram("shaders/shader_bloom.vert", "shaders/shader_bloom.frag");
+	programParticle = shaderLoader.CreateProgram("shaders/shader_particle.vert", "shaders/shader_particle.frag");

 	glUseProgram(programBlur);
 	glUniform1i(glGetUniformLocation(programBlur, "image"), 0);
@ -427,10 +615,47 @@ void init()
 	sunTexture = Core::LoadTexture("textures/sun.png");
 	earthTexture = Core::LoadTexture("textures/earth2.png");
 	moonTexture = Core::LoadTexture("textures/moon.png");
+	particleTexture = Core::LoadTexture("textures/sun.png");
 	skyboxTexture = loadCubemap(faces);

 	glGenFramebuffers(1, &FBO);
 	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
+	//particlepart
+	glGenVertexArrays(1, &VertexArrayID);
+	glBindVertexArray(VertexArrayID);
+	CameraRight_worldspace_ID = glGetUniformLocation(programParticle, "CameraRight_worldspace");
+	CameraUp_worldspace_ID = glGetUniformLocation(programParticle, "CameraUp_worldspace");
+	ViewProjMatrixID = glGetUniformLocation(programParticle, "VP");
+	TextureParticle = glGetUniformLocation(programParticle, "sprite");
+	g_particule_position_size_data = new GLfloat[MaxParticles * 4];
+	g_particule_color_data = new GLubyte[MaxParticles * 4];
+	for (int i = 0; i < MaxParticles; i++) {
+		ParticlesContainer[i].life = 100.0f;
+		ParticlesContainer[i].cameradistance = -1.0f;
+	}
+	static const GLfloat g_vertex_buffer_data[] = {
+		 -0.5f, -0.5f, 0.0f,
+		  0.5f, -0.5f, 0.0f,
+		 -0.5f,  0.5f, 0.0f,
+		  0.5f,  0.5f, 0.0f,
+	};
+	glGenBuffers(1, &particle_vertex_buffer);
+	glBindBuffer(GL_ARRAY_BUFFER, particle_vertex_buffer);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
+	// The VBO containing the positions and sizes of the particles
+	glGenBuffers(1, &particles_position_buffer);
+	glBindBuffer(GL_ARRAY_BUFFER, particles_position_buffer);
+	// Initialize with empty (NULL) buffer : it will be updated later, each frame.
+	glBufferData(GL_ARRAY_BUFFER, MaxParticles * 4 * sizeof(GLfloat), NULL, GL_STREAM_DRAW);
+
+	// The VBO containing the colors of the particles
+	glGenBuffers(1, &particles_color_buffer);
+	glBindBuffer(GL_ARRAY_BUFFER, particles_color_buffer);
+	// Initialize with empty (NULL) buffer : it will be updated later, each frame.
+	glBufferData(GL_ARRAY_BUFFER, MaxParticles * 4 * sizeof(GLubyte), NULL, GL_STREAM_DRAW);
+	lastTime = glutGet(GLUT_ELAPSED_TIME) / 1000.f;
+
+

 	glGenTextures(2, colorBuffers);
 	for (unsigned int i = 0; i < 2; i++)
@ -524,6 +749,8 @@ int main(int argc, char** argv)
 	glutSetOption(GLUT_MULTISAMPLE, 8);
 	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_MULTISAMPLE);
 	glEnable(GL_MULTISAMPLE);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glutInitWindowPosition(100, 200);
 	glutInitWindowSize(SCR_WIDTH, SCR_HEIGHT);
 	glutCreateWindow("GRK-PROJECT WIP");
@ -531,6 +758,7 @@ int main(int argc, char** argv)
 	//glutFullScreen();
 	glewInit();

+
 	init();
 	glutKeyboardFunc(keyboard);
 	//to sprawia, że obiekty ukryte przed kamerą  nie są renderowane