Index: NewOpenGLGame.vcxproj
===================================================================
--- NewOpenGLGame.vcxproj (revision f71d87dc18c06463ff1d4281ff63beb34f582bf7)
+++ NewOpenGLGame.vcxproj (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
@@ -163,4 +163,6 @@
+
+
Index: explosion.frag
===================================================================
--- explosion.frag (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
+++ explosion.frag (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
@@ -0,0 +1,12 @@
+#version 410 core
+
+in float opacity;
+
+out vec4 frag_color;
+
+vec4 particle_color = vec4 (0.5, 0.5, 0.8, 0.8);
+
+void main() {
+ frag_color.a = opacity;
+ frag_color.rgb = particle_color.rgb;
+}
Index: explosion.vert
===================================================================
--- explosion.vert (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
+++ explosion.vert (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
@@ -0,0 +1,22 @@
+#version 410 core
+
+uniform float elapsed_system_time;
+
+layout (location = 0) in vec3 v_i; // initial velocity
+layout (location = 1) in float start_time;
+
+out float opacity;
+
+void main() {
+ float t = elapsed_system_time - start_time;
+ t = mod(t, 3.0); // allow time to loop around so particle emitter keeps going
+
+ vec3 p = vec3(0.0, 0.0, 0.0);
+ vec3 a = vec3(0.0, -1.0, 0.0); // gravity
+ p += v_i * t + 0.5 * a * t * t;
+
+ opacity = 1.0 - (t / 3.0);
+
+ gl_Position = vec4(p, 1.0);
+ gl_PointSize = 15.0; // size in pixels
+}
Index: new-game.cpp
===================================================================
--- new-game.cpp (revision f71d87dc18c06463ff1d4281ff63beb34f582bf7)
+++ new-game.cpp (revision db06984dd8b4a063db3a92fd593585c1fa2d7f26)
@@ -157,4 +157,6 @@
GLuint* model_mat_idx_vbo);
+GLuint initializeParticleEffectBuffers();
+
void populateBuffers(vector& objects,
map& shaderBufferInfo,
@@ -193,8 +195,10 @@
void renderScene(map& shaderBufferInfo,
- GLuint color_sp, GLuint asteroid_sp, GLuint texture_sp, GLuint laser_sp,
- GLuint color_vao, GLuint asteroid_vao, GLuint texture_vao, GLuint laser_vao,
+ GLuint color_sp, GLuint asteroid_sp, GLuint texture_sp, GLuint laser_sp, GLuint explosion_sp,
+ GLuint color_vao, GLuint asteroid_vao, GLuint texture_vao, GLuint laser_vao, GLuint explosion_vao,
GLuint colors_vbo, GLuint selected_colors_vbo,
SceneObject* selectedObject);
+void renderExplosion(GLuint explosion_sp, GLuint explosion_vao, GLuint tex);
+
void renderSceneGui();
@@ -206,4 +210,5 @@
const int KEY_STATE_UNCHANGED = -1;
const bool FULLSCREEN = false;
+const int EXPLOSION_PARTICLE_COUNT = 300;
unsigned int MAX_UNIFORMS = 0; // Requires OpenGL constants only available at runtime, so it can't be const
@@ -438,4 +443,5 @@
GLuint texture_sp = loadShaderProgram("./texture.vert", "./texture.frag");
GLuint laser_sp = loadShaderProgram("./laser.vert", "./laser.frag");
+ GLuint explosion_sp = loadShaderProgram("./explosion.vert", "./explosion.frag");
shaderBufferInfo[color_sp] = BufferInfo();
@@ -558,4 +564,6 @@
glVertexAttribIPointer(2, 1, GL_UNSIGNED_INT, 0, 0);
+ GLuint explosion_vao = initializeParticleEffectBuffers();
+
float cam_speed = 1.0f;
float cam_yaw_speed = 60.0f*ONE_DEG_IN_RAD;
@@ -600,5 +608,4 @@
GLuint asteroid_proj_mat_loc = glGetUniformLocation(asteroid_sp, "proj");
GLuint asteroid_sp_models_ub_index = glGetUniformBlockIndex(asteroid_sp, "models");
- //GLuint asteroid_sp_hp_ub_index = glGetUniformBlockIndex(asteroid_sp, "hp_uniform");
GLuint view_mat_loc = glGetUniformLocation(texture_sp, "view");
@@ -610,4 +617,6 @@
GLuint laser_color_loc = glGetUniformLocation(laser_sp, "laser_color");
GLuint laser_sp_models_ub_index = glGetUniformBlockIndex(laser_sp, "models");
+
+ GLuint elapsed_system_time_loc = glGetUniformLocation(explosion_sp, "elapsed_system_time");
@@ -905,4 +914,7 @@
}
+ glUseProgram(explosion_sp);
+ glUniform1f(elapsed_system_time_loc, (GLfloat)current_seconds);
+
// Render scene
@@ -916,6 +928,6 @@
case STATE_GAME:
renderScene(shaderBufferInfo,
- color_sp, asteroid_sp, texture_sp, laser_sp,
- color_vao, asteroid_vao, texture_vao, laser_vao,
+ color_sp, asteroid_sp, texture_sp, laser_sp, explosion_sp,
+ color_vao, asteroid_vao, texture_vao, laser_vao, explosion_vao,
colors_vbo, selected_colors_vbo,
selectedObject);
@@ -1886,4 +1898,46 @@
}
+GLuint initializeParticleEffectBuffers() {
+ float vv[EXPLOSION_PARTICLE_COUNT * 3]; // initial velocities vec3
+ float vt[EXPLOSION_PARTICLE_COUNT]; // initial times
+ float t_accum = 0.0f; // start time
+
+ for (int i = 0; i < EXPLOSION_PARTICLE_COUNT; i++) {
+ vt[i] = t_accum;
+ t_accum += 0.01f;
+
+ float randx = ((float)rand() / (float)RAND_MAX) * 1.0f - 0.5f;
+ float randz = ((float)rand() / (float)RAND_MAX) * 1.0f - 0.5f;
+ vv[i*3] = randx;
+ vv[i*3 + 1] = 1.0f;
+ vv[i*3 + 2] = randz;
+ }
+
+ GLuint velocity_vbo;
+ glGenBuffers(1, &velocity_vbo);
+ glBindBuffer(GL_ARRAY_BUFFER, velocity_vbo);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vv), vv, GL_STATIC_DRAW);
+
+ GLuint time_vbo;
+ glGenBuffers(1, &time_vbo);
+ glBindBuffer(GL_ARRAY_BUFFER, time_vbo);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vt), vt, GL_STATIC_DRAW);
+
+ GLuint vao;
+ glGenVertexArrays(1, &vao);
+ glBindVertexArray(vao);
+
+ glBindBuffer(GL_ARRAY_BUFFER, velocity_vbo);
+ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+
+ glBindBuffer(GL_ARRAY_BUFFER, time_vbo);
+ glVertexAttribPointer(1, 1, GL_FLOAT, GL_FALSE, 0, NULL);
+
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+
+ return vao;
+}
+
void populateBuffers(vector& objects,
map& shaderBufferInfo,
@@ -2219,6 +2273,6 @@
void renderScene(map& shaderBufferInfo,
- GLuint color_sp, GLuint asteroid_sp, GLuint texture_sp, GLuint laser_sp,
- GLuint color_vao, GLuint asteroid_vao, GLuint texture_vao, GLuint laser_vao,
+ GLuint color_sp, GLuint asteroid_sp, GLuint texture_sp, GLuint laser_sp, GLuint explosion_sp,
+ GLuint color_vao, GLuint asteroid_vao, GLuint texture_vao, GLuint laser_vao, GLuint explosion_vao,
GLuint colors_vbo, GLuint selected_colors_vbo,
SceneObject* selectedObject) {
@@ -2259,4 +2313,22 @@
glDrawArrays(GL_TRIANGLES, shaderBufferInfo[laser_sp].vbo_base, shaderBufferInfo[laser_sp].vbo_offset);
+ glDisable(GL_BLEND);
+
+ renderExplosion(explosion_sp, explosion_vao, 0);
+}
+
+void renderExplosion(GLuint explosion_sp, GLuint explosion_vao, GLuint tex) {
+ glEnable(GL_BLEND);
+ glEnable(GL_PROGRAM_POINT_SIZE);
+
+ //glActiveTexture(GL_TEXTURE1);
+ //glBindTexture(GL_TEXTURE_2D, tex);
+ glUseProgram(explosion_sp);
+
+ glBindVertexArray(explosion_vao);
+
+ glDrawArrays(GL_POINTS, 0, EXPLOSION_PARTICLE_COUNT);
+
+ glDisable(GL_PROGRAM_POINT_SIZE);
glDisable(GL_BLEND);
}