Gloom: Setting up lights for rendering shadow maps

skyjake · Sep 1, 2019 · 73b0587 · 73b0587
1 parent dd857c6
commit 73b0587
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Showing 8 changed files with 65 additions and 7 deletions.
diff --git a/doomsday/tests/test_gloom/gloom/render/light.cpp b/doomsday/tests/test_gloom/gloom/render/light.cpp
@@ -26,9 +26,9 @@ namespace gloom {
 
 DENG2_PIMPL(Light)
 {
-    Vec3d origin;
-    Vec3f dir;
-    Vec3f intensity;
+    Vec3d origin    { -100, 100, 30 };
+    Vec3f dir       { 100, -100, -30 };
+    Vec3f intensity { 10, 10, 10 };
     GLTexture shadowMap;
     GLFramebuffer framebuf;
 
@@ -48,9 +48,14 @@ Light::Light()
     : d(new Impl(this))
 {}
 
+GLFramebuffer &Light::framebuf()
+{
+    return d->framebuf;
+}
+
 Mat4f Light::lightMatrix() const
 {
-    return Mat4f::ortho(-10, 10, -10, 10, 1, 10) *
+    return Mat4f::ortho(-50, 50, -50, 50, 1, 200) *
            Mat4f::lookAt(d->origin + d->dir, d->origin, Vec3f(0, 1, 0));
 }
 

diff --git a/doomsday/tests/test_gloom/gloom/render/light.h b/doomsday/tests/test_gloom/gloom/render/light.h
@@ -19,6 +19,7 @@
 #ifndef GLOOM_RENDER_LIGHT_H
 #define GLOOM_RENDER_LIGHT_H
 
+#include <de/GLFramebuffer>
 #include <de/GLTexture>
 #include <de/Matrix>
 #include <de/Vector>
@@ -49,8 +50,9 @@ class Light
     float     fovY() const;
     float     aspectRatio() const;
 
-    de::GLTexture &shadowMap();
-    de::Mat4f      lightMatrix() const;
+    de::GLTexture &    shadowMap();
+    de::GLFramebuffer &framebuf();
+    de::Mat4f          lightMatrix() const;
 
 private:
     DENG2_PRIVATE(d)

diff --git a/doomsday/tests/test_gloom/gloom/render/lightrender.cpp b/doomsday/tests/test_gloom/gloom/render/lightrender.cpp
@@ -19,19 +19,33 @@
 #include "gloom/render/lightrender.h"
 #include "gloom/render/light.h"
 
+using namespace de;
+
 namespace gloom {
 
 DENG2_PIMPL(LightRender)
 {
-    std::unique_ptr<Light> skyLight;
+    Drawable *                        shadowGeometry = nullptr;
+    GLState                           state;
+    GLProgram                         program;
+    std::unique_ptr<Light>            skyLight;
     QHash<ID, std::shared_ptr<Light>> lights;
+    GLUniform                         uLightMatrix{"uLightMatrix", GLUniform::Mat4};
 
     Impl(Public *i) : Base(i)
     {}
 
     void glInit()
     {
+        state.setBlend(false);
+        state.setDepthTest(true);
+        state.setDepthWrite(true);
+        state.setColorMask(gl::WriteNone);
+        state.setCull(gl::Front);
+
         skyLight.reset(new Light);
+
+        self().context().shaders->build(program, "gloom.shadow") << uLightMatrix;
     }
 
     void glDeinit()
@@ -58,7 +72,26 @@ void LightRender::glDeinit()
 
 void LightRender::render()
 {
+    auto &sg = *d->shadowGeometry;
+
+    sg.setProgram(d->program);
+    sg.setState(d->state);
+
+    for (auto *light : {d->skyLight.get()})
+    {
+        d->state.setTarget(light->framebuf())
+                .setViewport(Rectangleui::fromSize(light->framebuf().size()));
+        d->uLightMatrix = light->lightMatrix();
+        sg.draw();
+    }
 
+    sg.unsetState();
+    sg.setProgram(d->shadowGeometry->program());
+}
+
+void gloom::LightRender::setShadowGeometry(Drawable &sg)
+{
+    d->shadowGeometry = &sg;
 }
 
 void LightRender::createLights()

diff --git a/doomsday/tests/test_gloom/gloom/render/lightrender.h b/doomsday/tests/test_gloom/gloom/render/lightrender.h
@@ -21,6 +21,8 @@
 
 #include "gloom/render/render.h"
 
+#include <de/Drawable>
+
 namespace gloom {
 
 /**
@@ -35,6 +37,7 @@ class LightRender : public Render
     void glDeinit() override;
     void render() override;
 
+    void setShadowGeometry(de::Drawable &);
     void createLights();
 
 private:

diff --git a/doomsday/tests/test_gloom/gloom/render/maprender.cpp b/doomsday/tests/test_gloom/gloom/render/maprender.cpp
@@ -142,6 +142,7 @@ DENG2_PIMPL(MapRender)
         buildMap();
         ents.createEntities();
         lights.createLights();
+        lights.setShadowGeometry(drawable);
     }
 
     void glDeinit()
@@ -216,6 +217,9 @@ void MapRender::advanceTime(TimeSpan)
 
 void MapRender::render()
 {
+    d->lights.render();
+
+    //d->drawable.setState(d->state);
     d->drawable.draw();
     d->ents.render();
 }

diff --git a/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/gloom.dei b/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/gloom.dei
@@ -3,6 +3,7 @@
 
 group gloom {
     shader surface { path = "surface" }
+    shader shadow { path = "shadow"}
     shader ssao { path = "ssao" }
     shader ssao_denoise {
         path.vertex = "ssao.vsh"

diff --git a/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/shadow.fsh b/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/shadow.fsh
@@ -0,0 +1,3 @@
+void main(void) {
+    // nothing to do
+}
diff --git a/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/shadow.vsh b/doomsday/tests/test_gloom/net.dengine.gloom.pack/shaders/shadow.vsh
@@ -0,0 +1,7 @@
+uniform mat4 uLightMatrix;
+
+DENG_ATTRIB vec4 aVertex;
+
+void main(void) {
+    gl_Position = uLightMatrix * aVertex;
+}