added working particle engine. needs improvement.

game/CMakeLists.txt

@@ -13,12 +13,15 @@ set(GAME_SRC
     renderer.cpp
     renderer_polygon_2d/renderer_polygon_2d.cpp
     renderer_polygon_3d/renderer_polygon_3d.cpp
+    renderer_polygon_3d/polygon_model.cpp
+    renderer_polygon_3d/particle_batch.cpp
     renderer_ray_tracer/renderer_ray_tracer.cpp
 
     network/session.cpp
 
     util.cpp
     game.cpp
+
     state/object.cpp
     state/explosion.cpp
     state/trace.cpp

game/game.cpp

@@ -6,7 +6,7 @@
 
 #include <cmath>
 
-#define QUICK_TEST
+//#define QUICK_TEST
 
 Game::Game()
 {
@@ -44,12 +44,12 @@ bool Game::cycle(float dt)
     acc   += dt;
     total += dt;
 
-    float spawnInterval = 1.0;
+    float spawnInterval = 0.1;
     while (acc > spawnInterval) {
         acc -= spawnInterval;
 
         float angle = 360.0 * util::randf_0_1();
-        float speed = 0.005;
+        float speed = 0.01;
 
         m_state->players.back()->addCommand(new game::SetSpeedCommand(speed));
         m_state->players.back()->addCommand(new game::ShootCommand(angle));

game/renderer_polygon_3d/particle_batch.cpp

@@ -0,0 +1,181 @@
+#include "particle_batch.hpp"
+
+#include <iostream>
+
+namespace endofthejedi {
+    ParticleBatch::ParticleBatch(size_t numParticles, float particleSize)
+        : m_numParticles(numParticles)
+        , m_particleRadius(particleSize)
+    {
+        std::cout<<"[ParticleBatch] create for " << numParticles << " num particles" << std::endl;
+
+        size_t s = m_numParticles*4;
+
+        m_data_velocity.resize(s);
+        m_data_position.resize(s);
+        m_data_kind.resize(s);
+        m_data_max_age.resize(s);
+
+        std::string vss_particles =
+            "#version 120\n"
+            "varying vec3 vertex;\n"
+            "uniform float time;\n"
+            "uniform float size;\n"
+            "uniform vec2 velocity;\n"
+            "void main()\n"
+            "{\n"
+            "  vec3 p = size*gl_Vertex.xyz;\n"
+            //"  vec3 p = gl_Vertex.xyz;\n"
+            "  p.xy += velocity*time;\n"
+            "  gl_Position = vec4(p, 1.0);\n"
+            "  vertex = p;\n"
+            "}\n"
+            ;
+
+        std::string fss_particles =
+            "#version 120\n"
+            "varying vec3 vertex;\n"
+            "void main()\n"
+            "{\n"
+            "  gl_FragColor = vec4(1.0, 1.0, 0.0, 1.0);\n"
+            "}\n"
+            ;
+
+        m_shader.init();
+        m_shader.load(vss_particles.c_str(), GL_VERTEX_SHADER);
+        m_shader.load(fss_particles.c_str(), GL_FRAGMENT_SHADER);
+    }
+
+    ParticleBatch::~ParticleBatch()
+    {
+        // TODO: find out if stuff must be deallocated
+    }
+
+    void ParticleBatch::setParticle(size_t index, const glm::vec2 &p, const glm::vec2 &v, float kind, float maxAge)
+    {
+        if (index >= m_numParticles) {
+            return;
+        }
+
+        //std::cout<<"[ParticleBatch] setParticle " << index << std::endl;
+
+        // 4 for use as tri / quad
+        const static glm::vec2 triangles[4] = {
+            glm::vec2( 1.0f, -1.0f),
+            glm::vec2( 1.0f,  1.0f),
+            glm::vec2(-1.0f,  1.0f),
+            glm::vec2(-1.0f, -1.0f),
+        };
+
+
+        for (size_t i=0; i<4; i++) {
+            const size_t data_index = 4*index+i;
+
+            m_data_position[data_index] = p + triangles[i];
+
+            m_data_velocity[data_index] = v;
+            m_data_kind[data_index]     = kind;
+            m_data_max_age[data_index]  = maxAge;
+        }
+    }
+
+    void ParticleBatch::bind()
+    {
+        //std::cout<<"[ParticleBatch] bind" << std::endl;
+
+        for (size_t i=0; i<4; i++) {
+            //std::cout<<"vbo #" << i << ": " << m_data_vbos[i] << std::endl;
+            glEnableVertexAttribArray(i);
+            glBindBuffer(GL_ARRAY_BUFFER, m_data_vbos[i]);
+
+            // TODO: i or index? at first argument?
+            glVertexAttribPointer(
+                    i,
+                    dataSizeForIndex(i),
+                    GL_FLOAT,  // Data is floating point type
+                    GL_FALSE,  // No fixed point scaling
+                    0,         // stride: no
+                    NULL);     // No offset
+        }
+    }
+
+    void ParticleBatch::upload()
+    {
+        std::cout<<"[ParticleBatch] upload" << std::endl;
+
+        glGenBuffers(4, m_data_vbos);            // Generate buffer
+
+        for (size_t i=0; i<4; i++) {
+            glEnableVertexAttribArray(i);
+            glBindBuffer(GL_ARRAY_BUFFER, m_data_vbos[i]);
+
+            // fill buffer with the loaded mesh position data
+            glBufferData(
+                    GL_ARRAY_BUFFER,                           // Buffer target
+                    dataSizeForIndex(i) * 4 * m_numParticles * sizeof(float), // Buffer data size
+                    dataSourceForIndex(i),                     // Buffer data pointer
+                    GL_STATIC_DRAW);                           // Usage - Data never changes;
+        }
+    }
+
+    void ParticleBatch::render()
+    {
+        //std::cout<<"[ParticleBatch] render " << std::endl;
+
+        m_shader.bind();
+
+        static float time = 0.0f;
+        time += 1.0/50.0;
+
+        glUniform1f(m_shader.location("time"),     time);
+        glUniform1f(m_shader.location("size"),     m_particleRadius);
+        glUniform2f(m_shader.location("velocity"), m_data_velocity[0].x, m_data_velocity[0].y);
+
+        bind();
+
+        glDrawArrays(GL_TRIANGLE_FAN, 0, 4*m_numParticles);
+
+#if 0
+        glBegin(GL_QUADS);
+        for (size_t index=0; index<m_numParticles; index++) {
+            for (int i=0; i<4; i++) {
+                glm::vec2 p = m_data_position[index] + triangles[i];
+                //glColor3f(1.0, 0.0, 0.0);
+                glVertex2f(p.x, p.y);
+            }
+        }
+        glEnd();
+#endif
+
+    }
+
+    size_t ParticleBatch::dataSizeForIndex(int i)
+    {
+        switch(i) {
+            case 0:
+            case 1:
+                return 2;
+
+            case 2:
+            case 3:
+                return 1;
+
+            default:
+                std::cerr << "bad" << std::endl;
+                return 0;
+        }
+    }
+
+    void *ParticleBatch::dataSourceForIndex(int i)
+    {
+        switch(i) {
+            case 0: return (void *) m_data_position.data();
+            case 1: return (void *) m_data_velocity.data();
+            case 2: return (void *) m_data_kind.data();
+            case 3: return (void *) m_data_max_age.data();
+            default:
+                std::cerr << "bad" << std::endl;
+                return nullptr;
+        }
+    }
+}

game/renderer_polygon_3d/particle_batch.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <vector>
+
+#include <glm/vec2.hpp>
+
+#include "glclasses.hpp"
+
+namespace endofthejedi {
+    class ParticleBatch {
+        public:
+            ParticleBatch(size_t numParticles, float particleRadius);
+
+            // deallocate opengl stuff on destroy
+            ~ParticleBatch();
+
+            size_t numParticles() const { return m_numParticles; }
+
+            void setParticle(size_t index, const glm::vec2 &p, const glm::vec2 &v, float kind, float maxAge);
+
+            void bind();
+            void upload();
+            void render();
+
+            Shader *shader() { return &m_shader; }
+
+        private:
+            size_t dataSizeForIndex(int i);
+            void  *dataSourceForIndex(int i);
+
+        private:
+            size_t                 m_numParticles;
+            GLuint                 m_data_vbos[4];
+
+            std::vector<glm::vec2> m_data_position;
+            std::vector<glm::vec2> m_data_velocity;
+            std::vector<float>     m_data_kind;
+            std::vector<float>     m_data_max_age;
+
+            float                  m_particleRadius;
+
+            Shader                 m_shader;
+    };
+}

game/renderer_polygon_3d/polygon_model.hpp

@@ -10,6 +10,7 @@
 #include <epoxy/gl.h>
 #include <epoxy/glx.h>
 
+namespace endofthejedi {
     class PolygonModel {
         public:
             PolygonModel(const std::string &filename) : m_filename(filename)
@@ -226,4 +227,4 @@ class PolygonModel {
             GLuint      m_vbo_id_position;
             GLuint      m_vbo_id_normal;
     };
-
+}

game/renderer_polygon_3d/renderer_polygon_3d.cpp

@@ -6,8 +6,6 @@
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtx/euler_angles.hpp>
 
-#include "polygon_model.hpp"
-
 namespace endofthejedi {
     void RendererPolygon3d::setup()
     {
@@ -20,6 +18,21 @@ namespace endofthejedi {
         addModel("../data/mesh/planet_12.stl",         &m_planetModel);
         addModel("../data/mesh/ship.stl",              &m_shipModel);
 
+        size_t n = 10;
+
+        m_particles = new ParticleBatch(n, 0.01);
+
+        for (size_t i=0; i<n; i++) {
+            m_particles->setParticle(
+                    i,
+                    glm::vec2(i/(float) n, 0.0),
+                    glm::vec2(1.0, 1.0),
+                    0.0,
+                    0.0);
+        }
+
+        m_particles->upload();
+
         std::string vss_simple =
             "#version 120\n"
             "varying vec3 vertex;\n"
@@ -81,6 +94,8 @@ namespace endofthejedi {
 
     void RendererPolygon3d::render(const game::State *state)
     {
+        glClearColor(0.0, 0.0, 0.0, 1.0);
+
         m_state = state;
 
         m_shader.bind();
@@ -91,6 +106,8 @@ namespace endofthejedi {
         renderShips();
         renderMissiles();
 
+        //renderParticles();
+
         //glColor3f(1.0, 0.0, 0.0);
         //glBegin(GL_QUADS);
         //glVertex2f(-1.0f, -1.0f);
@@ -100,6 +117,12 @@ namespace endofthejedi {
         //glEnd();
     }
 
+    void RendererPolygon3d::renderParticles()
+    {
+        //m_particles->bind();
+        m_particles->render();
+    }
+
     void RendererPolygon3d::renderPlanets()
     {
         m_planetModel->bind();

game/renderer_polygon_3d/renderer_polygon_3d.hpp

@@ -12,9 +12,10 @@
 #include "state/ship.hpp"
 #include "state/explosion.hpp"
 
-#include <glm/gtc/matrix_transform.hpp>
+#include "particle_batch.hpp"
+#include "polygon_model.hpp"
 
-class PolygonModel;
+#include <glm/gtc/matrix_transform.hpp>
 
 namespace endofthejedi {
 
@@ -27,6 +28,7 @@ namespace endofthejedi {
             void renderPlanets();
             void renderMissiles();
             void renderShips();
+            void renderParticles();
 
             void addModel(const std::string &filename, PolygonModel **dest);
 
@@ -52,5 +54,7 @@ namespace endofthejedi {
 
             // for accessing
             const game::State *m_state;
+
+            ParticleBatch     *m_particles;
     };
 }