From 411b53fd96b3e43960fcd1bf4bfeefe4c5e2f164 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 10 Jun 2023 10:57:53 +0200
Subject: wip

---
 shaders/lightmap.cpp | 61 +++++++++++++++++++++++++++++++++-------------------
 1 file changed, 39 insertions(+), 22 deletions(-)

(limited to 'shaders/lightmap.cpp')

diff --git a/shaders/lightmap.cpp b/shaders/lightmap.cpp
index 8e8e1884..a599cfc9 100644
--- a/shaders/lightmap.cpp
+++ b/shaders/lightmap.cpp
@@ -31,7 +31,7 @@ auto lightmap_shader::make_framebuffer() -> Framebuffer
     framebuffer.fb = GL::Framebuffer{{ {}, image_size }};
 
     framebuffer.color = GL::Texture2D{};
-    framebuffer.color.setStorage(1, GL::TextureFormat::RGBA8, image_size);
+    framebuffer.color.setStorage(1, GL::TextureFormat::RGB8, image_size);
     //framebuffer.depth = GL::Renderbuffer{};
     //framebuffer.depth.setStorage(GL::RenderbufferFormat::DepthComponent32F, fb_size);
 
@@ -80,18 +80,17 @@ lightmap_shader::lightmap_shader() :
 
 void lightmap_shader::flush_vertexes()
 {
-    // todo
-}
-
-void lightmap_shader::clear()
-{
-    framebuffer.fb.clearColor(0, Color4{1.f, 0.f, 1.f, 1.f});
-    //framebuffer.fb.clearDepth(0);
-}
-
-void lightmap_shader::bind()
-{
-    framebuffer.fb.bind();
+    if (_count > 0)
+    {
+        _index_buf.setSubData(0, ArrayView<std::array<UnsignedShort, 6>>{_indexes, 1});
+        _vertex_buf.setSubData(0, ArrayView<std::array<Vector2, 4>>{_quads, 1});
+
+        GL::MeshView mesh{_mesh};
+        mesh.setCount((int)(6 * _count));
+        mesh.setIndexRange(0, 0, (uint32_t)(_count * 6 - 1));
+        AbstractShaderProgram::draw(mesh);
+        _count = 0;
+    }
 }
 
 std::array<UnsignedShort, 6> lightmap_shader::quad_indexes(size_t N)
@@ -106,40 +105,51 @@ std::array<UnsignedShort, 6> lightmap_shader::quad_indexes(size_t N)
 void lightmap_shader::add_light(Vector2i neighbor_offset, const light_s& light)
 {
     fm_debug_assert(_count == 0);
+    fm_debug_assert(_quads.size() > 0);
 
     constexpr auto tile_size = TILE_SIZE2.sum()/2;
     constexpr auto scale = 2/chunk_size;
     auto dist = std::fmax(0.f, light.dist * tile_size);
+    auto dist_clip = dist * tile_size;
     auto center = light.center + chunk_offset + Vector2(neighbor_offset)*chunk_size;
     auto center_clip = Vector2{center} * scale; // clip coordinate
     constexpr auto image_size_factor = Vector2(image_size) / Vector2(chunk_size);
     auto center_fragcoord = center * image_size_factor; // window-relative coordinates
 
-    _indexes[0] = quad_indexes(0);
-    _quads[0] = std::array<Vector2, 4>{{
-        {  dist + center_clip.x(), -dist + center_clip.y() },
-        {  dist + center_clip.x(),  dist + center_clip.y() },
-        { -dist + center_clip.x(), -dist + center_clip.y() },
-        { -dist + center_clip.x(),  dist + center_clip.y() },
+    _indexes[_count] = quad_indexes(0);
+    _quads[_count] = std::array<Vector2, 4>{{
+        {  dist_clip + center_clip.x(), -dist_clip + center_clip.y() },
+        {  dist_clip + center_clip.x(),  dist_clip + center_clip.y() },
+        { -dist_clip + center_clip.x(), -dist_clip + center_clip.y() },
+        { -dist_clip + center_clip.x(),  dist_clip + center_clip.y() },
     }};
 
-    _index_buf.setSubData(0, ArrayView<std::array<UnsignedShort, 6>>{_indexes, 1});
-    _vertex_buf.setSubData(0, ArrayView<std::array<Vector2, 4>>{_quads, 1});
+    _count++;
 
     setUniform(ColorIntensityUniform, Vector4{Vector3{light.color}, dist});
     setUniform(CenterUniform, center_fragcoord);
     setUniform(FalloffUniform, (uint32_t)light.falloff);
     setUniform(SizeUniform, chunk_size);
+}
 
+lightmap_shader::~lightmap_shader() = default;
 
+void lightmap_shader::clear()
+{
+    framebuffer.fb.clearColor(0, Color4{1.f, 0.f, 1.f, 1.f});
+    //framebuffer.fb.clearDepth(0);
 }
 
-lightmap_shader::~lightmap_shader() = default;
+void lightmap_shader::bind()
+{
+    framebuffer.fb.bind();
+}
 
 void lightmap_shader::begin(Vector2i neighbor_offset, const light_s& light)
 {
     fm_assert(_count == 0);
     clear();
+    bind();
     add_light(neighbor_offset, light);
 }
 
@@ -148,6 +158,13 @@ void lightmap_shader::end()
     flush_vertexes();
 }
 
+GL::Texture2D& lightmap_shader::texture()
+{
+    fm_assert(_count == 0);
+    fm_debug_assert(framebuffer.color.id());
+    return framebuffer.color;
+}
+
 bool light_s::operator==(const light_s&) const noexcept = default;
 
 } // namespace floormat
-- 
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