examples

commit 6c3177246d046388bec96ca34516ec117c221bce
parent ea51d2f712d3f95513f8c928fb52b6e5f01f9969
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Mon,  4 Apr 2022 21:30:44 +0100

gl-asteroids: Add stars and improve flame effect

Diffstat:
M
src/gl-asteroids.cpp
 | 
33
+++++++++++++++++++++------------

1 file changed, 21 insertions(+), 12 deletions(-)
diff --git a/src/gl-asteroids.cpp b/src/gl-asteroids.cpp
@@ -38,7 +38,7 @@ struct visual
 coord const shipv[] = {{0, 2}, {1, -1}, {-1, -1},  {1,-1}, {.5,0}, {.5,0}};
 color const shipc[] = {{1,1,1}, {.5,.5,.5}};
 
-coord const flamev[3] = {{0, -2}, {.5, -1}, {-.5, -1}};
+coord const flamev[3] = {{0, -2.5}, {.6, -.25}, {-.6, -.25}};
 color const flamec[] = {{1,0,0}, {1,1,0}};
 
 coord const rockv1[] = {{0, 0}, {1, 0}, {0, 1}, {-1, 0}, {0, -1}, {1, 0}};
@@ -51,6 +51,8 @@ color const rockc[] = {{.5,.5,.5}, {.2,.2,.2}};
 coord const bulletv[] = {{0, 4}, {1, 1}, {-1, 1}, {1, -4}, {-1, -4}};
 color const bulletc[] = {{.0,.8,.0}, {.0,.4,.0}, {.0,.4,.0}, {.0,.0,.0}};
 
+coord starsv[64];
+
 visual ship{GL_TRIANGLES, shipv, shipc};
 visual flame{GL_TRIANGLES, flamev, flamec};
 visual bullet(GL_TRIANGLE_STRIP, bulletv, bulletc);
@@ -227,20 +229,30 @@ std::vector<entity> bullets;
 physics s{{}, {}, 0.f, 0.f, .06f};
 bool up = false;
 
-void draw_scene(void)
+void draw_scene(float t)
 {
 	glClearColor(0,0,0,1);
 	glClear(GL_COLOR_BUFFER_BIT);
 
+	glColor({1,1,1});
+	glBegin(GL_POINTS);
+	for (auto v : starsv)
+		glCoord(v);
+	glEnd();
+
 	particle::draw_all();
 	for (auto& r : rocks)
 		r.draw();
 	for (auto& b : bullets)
 		b.draw();
 
-	draw_wrapped(ship, s);
 	if (up)
-		draw(flame, s);
+	{
+		auto f = s;
+		f.scale *= 1 + 0.1 * sin(t * 49) * sin(t * 9);
+		draw_wrapped(flame, f);
+	}
+	draw_wrapped(ship, s);
 
 	glfwSwapBuffers(w);
 	glfwPollEvents();
@@ -268,6 +280,9 @@ int main(int argc, char* argv[])
 
 	float rock_time = 1, bullet_time = 0;
 
+	for (auto& c : starsv)
+		c.x = dis_p(gen), c.y = dis_p(gen);
+
 	while (!glfwWindowShouldClose(w) && not is_pressed(GLFW_KEY_ESCAPE))
 	{
 		float t = glfwGetTime();
@@ -334,12 +349,6 @@ int main(int argc, char* argv[])
 		{
 			float sr = sin(s.rot), cr = cos(s.rot);
 			s.vel += coord{sr, cr} * dt;
-
-			auto f = s;
-			f.ang_mom = 0;
-			f.vel = coord{sr, cr} * -0.5;
-			f.vel += coord{cr, -sr} * 0.2 * dis_p(gen);
-			particle::make_particle(entity(flame, f), 1);
 		}
 
 		// resolve motion
@@ -397,11 +406,11 @@ int main(int argc, char* argv[])
 			auto timeout = std::chrono::steady_clock::now() + 1s;
 			std::cout << "Score: " << score << '\n';
 			while (std::chrono::steady_clock::now() < timeout)
-				draw_scene();
+				draw_scene(t);
 			break;
 		}
 
-		draw_scene();
+		draw_scene(t);
 	}
 
 	glfwDestroyWindow(w);