skybox: added moon and stars

src/frontend/graphics/Skybox.cpp

@@ -1,19 +1,28 @@
 #include "Skybox.h"
-#include <GL/glew.h>
+
 #include <iostream>
+#include <GL/glew.h>
 #include <glm/glm.hpp>
 
+#include "../../assets/Assets.h"
 #include "../../graphics/Shader.h"
 #include "../../graphics/Mesh.h"
+#include "../../graphics/Batch3D.h"
 #include "../../window/Window.h"
+#include "../../window/Camera.h"
 
 #ifndef M_PI
 #define M_PI 3.141592
 #endif // M_PI
 
-using glm::vec3;
+const int STARS_COUNT = 3000;
+const int STARS_SEED = 632;
 
-Skybox::Skybox(uint size, Shader* shader) : size(size), shader(shader) {
+Skybox::Skybox(uint size, Shader* shader) 
+    : size(size), 
+      shader(shader), 
+      batch3d(new Batch3D(4096)) 
+{
     glGenTextures(1, &cubemap);
     glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
     glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@@ -31,30 +40,118 @@ Skybox::Skybox(uint size, Shader* shader) : size(size), shader(shader) {
         -1.0f, -1.0f,  1.0f, 1.0f, 1.0f, -1.0f
     };
     vattr attrs[] {2, 0};
-    mesh = new Mesh(vertices, 6, attrs);
+    mesh = std::make_unique<Mesh>(vertices, 6, attrs);
+
+    sprites.push_back(skysprite {
+        "misc/moon",
+        M_PI*0.5f,
+        4.0f,
+        false
+    });
+
+    sprites.push_back(skysprite {
+        "misc/sun",
+        M_PI*1.5f,
+        4.0f,
+        true
+    });
 }
 
 Skybox::~Skybox() {
     glDeleteTextures(1, &cubemap);
     glDeleteFramebuffers(1, &fbo);
-    delete mesh;
 }
 
-void Skybox::draw(Shader* shader) {
-    shader->uniform1i("u_cubemap", 1);
+void Skybox::drawBackground(Camera* camera, Assets* assets, int width, int height) {
+    Shader* backShader = assets->getShader("background");
+    backShader->use();
+	backShader->uniformMatrix("u_view", camera->getView(false));
+	backShader->uniform1f("u_zoom", camera->zoom*camera->getFov()/(M_PI*0.5f));
+	backShader->uniform1f("u_ar", float(width)/float(height));
+    backShader->uniform1i("u_cubemap", 1);
     bind();
     mesh->draw();
     unbind();
 }
 
-void Skybox::refresh(float t, float mie, uint quality) {
+void Skybox::drawStars(Camera* camera, float angle, float opacity) {
+    batch3d->texture(nullptr);
+    random.setSeed(STARS_SEED);
+    for (int i = 0; i < STARS_COUNT; i++) {
+        float rx = (random.randFloat()) - 0.5f;
+        float ry = (random.randFloat()) - 0.5f;
+        float z = (random.randFloat()) - 0.5f;
+        float x = rx * sin(angle) + ry * -cos(angle);
+        float y = rx * cos(angle) + ry * sin(angle);
+
+        float sopacity = random.randFloat();
+        if (y < 0.0f)
+            continue;
+
+        sopacity *= (0.2f+sqrt(cos(angle))*0.5) - 0.05;
+        glm::vec4 tint (1,1,1, sopacity * opacity);
+        batch3d->point(camera->position + glm::vec3(x, y, z), tint);
+    }
+    batch3d->flushPoints();
+}
+
+void Skybox::draw(
+    const GfxContext& pctx, 
+    Camera* camera, 
+    Assets* assets, 
+    float daytime,
+    float fog) 
+{
+    const Viewport& viewport = pctx.getViewport();
+    int width = viewport.getWidth();
+	int height = viewport.getHeight();
+
+    drawBackground(camera, assets, width, height);
+
+    GfxContext ctx = pctx.sub();
+    ctx.blendMode(blendmode::addition);
+
+    Shader* shader = assets->getShader("ui3d");
+    shader->use();
+    shader->uniformMatrix("u_projview", camera->getProjView());
+    shader->uniformMatrix("u_apply", glm::mat4(1.0f));
+    batch3d->begin();
+
+    float angle = daytime * M_PI * 2;
+    float opacity = glm::pow(1.0f-fog, 7.0f);
+    
+    for (auto& sprite : sprites) {
+        batch3d->texture(assets->getTexture(sprite.texture));
+
+        float sangle = daytime * M_PI*2 + sprite.phase;
+        float distance = sprite.distance;
+
+        glm::vec3 pos(-cos(sangle)*distance, sin(sangle)*distance, 0);
+        glm::vec3 up(-sin(-sangle), cos(-sangle), 0.0f);
+        glm::vec4 tint (1,1,1, opacity);
+        if (!sprite.emissive) {
+            tint *= 0.6f+cos(angle)*0.4;
+        }
+        batch3d->sprite(camera->position+pos, up, 
+                        glm::vec3(0, 0, -1), 1, 1, UVRegion(), tint);
+    }
+
+    drawStars(camera, angle, opacity);
+}
+
+void Skybox::refresh(const GfxContext& pctx, float t, float mie, uint quality) {
+    GfxContext ctx = pctx.sub();
+    ctx.depthMask(false);
+    ctx.depthTest(false);
+
     ready = true;
     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
     glActiveTexture(GL_TEXTURE1);
     glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
     shader->use();
-    Window::viewport(0,0, size,size);
-    const vec3 xaxs[] = {
+    Window::viewport(0,0, size, size);
+
+    const glm::vec3 xaxs[] = {
         {0.0f, 0.0f, -1.0f},
         {0.0f, 0.0f, 1.0f},
         {-1.0f, 0.0f, 0.0f},
@@ -63,7 +160,7 @@ void Skybox::refresh(float t, float mie, uint quality) {
         {-1.0f, 0.0f, 0.0f},
         {1.0f, 0.0f, 0.0f},
     };
-    const vec3 yaxs[] = {
+    const glm::vec3 yaxs[] = {
         {0.0f, 1.0f, 0.0f},
         {0.0f, 1.0f, 0.0f},
         {0.0f, 0.0f, -1.0f},
@@ -73,7 +170,7 @@ void Skybox::refresh(float t, float mie, uint quality) {
         {0.0f, 1.0f, 0.0f},
     };
 
-    const vec3 zaxs[] = {
+    const glm::vec3 zaxs[] = {
         {1.0f, 0.0f, 0.0f},
         {-1.0f, 0.0f, 0.0f},
         {0.0f, -1.0f, 0.0f},
@@ -87,7 +184,7 @@ void Skybox::refresh(float t, float mie, uint quality) {
     shader->uniform1i("u_quality", quality);
     shader->uniform1f("u_mie", mie);
     shader->uniform1f("u_fog", mie - 1.0f);
-    shader->uniform3f("u_lightDir", glm::normalize(vec3(sin(t), -cos(t), -0.7f)));
+    shader->uniform3f("u_lightDir", glm::normalize(glm::vec3(sin(t), -cos(t), 0.0f)));
     for (uint face = 0; face < 6; face++) {
         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, cubemap, 0);
         shader->uniform3f("u_xaxis", xaxs[face]);