83a1f16806
- BillboardInstance: per-instance uv sub-rect, feet anchor, turn, dithered alpha, flash; BillboardBatch::sharedTexture; Texture createEmpty/update/cellUV/cellAnchor/nearest - SpriteAtlas: fixed-cell runtime atlas with gutters - hd2d::ui: Octopath-style panels, fonts (Cinzel, EB Garamond), dialogue box with typewriter + portraits + choices, menus, nameplates, toasts, ImGui theme - DayCycle (dawn/day/dusk/night keyframes, sun + moon arcs), Weather overcast/mist/ lightning, night-aware presets, stars and moon in the sky - Hidden-window offscreen captures (Window visible=false, Renderer output FBO, OffscreenTarget); --screenshot never opens a window - Camera::worldToScreen; CMake usable via add_subdirectory (HD2D_BUILD_DEMO, HD2D_ENGINE_ASSET_DIR)
70 lines
3.0 KiB
C++
70 lines
3.0 KiB
C++
#pragma once
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#include "hd2d/GL.h"
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#include "hd2d/Texture.h"
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#include <glm/glm.hpp>
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#include <vector>
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namespace hd2d {
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// One upright pixel-art sprite. `pos` is where the feet (pivot) row touches
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// the ground; sprites face the camera around the Y axis. 64 bytes, read by
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// billboard.vert as four vec4 attributes (keep both in sync).
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//
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// A default-initialised instance draws the whole texture, planted by its
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// lowest opaque row. Set `uv` to draw one frame of a sprite sheet / atlas
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// cell (see Texture::cellUV, SpriteAtlas::uv) and `anchor` to that frame's
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// feet row (Texture::cellAnchor, SpriteAtlas::anchor).
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struct BillboardInstance {
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glm::vec3 pos{0.0f};
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float sway = 0.0f; // wind / player-push response (0 = rigid)
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glm::vec2 size{1.0f}; // world size of the `uv` sub-rect quad
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float flip = 0.0f; // 1 = mirror horizontally (inside the sub-rect)
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float tint = 1.0f; // brightness multiplier (breaks up repetition)
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glm::vec4 uv{0, 0, 1, 1}; // texture sub-rect (minU, minV, maxU, maxV), GL orientation (v = 0 is the image bottom)
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float anchor = -1.0f; // texture-space v of the feet (pivot) row; < 0 = use tex().opaqueBounds().y
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float turn = 0.0f; // extra yaw (radians) away from camera-facing; color pass only, shadow cards stay sun-facing
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float alpha = 1.0f; // 0..1 fade, dithered discard in color and shadow passes (no blending)
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float flash = 0.0f; // 0..1 blend toward bright emissive white (hit / capture flash)
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};
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// Instanced batch of billboards sharing one texture: its own `texture`, or
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// `sharedTexture` (e.g. a SpriteAtlas page shared by many batches) when set.
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class BillboardBatch {
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public:
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BillboardBatch() = default;
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BillboardBatch(const BillboardBatch&) = delete;
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BillboardBatch& operator=(const BillboardBatch&) = delete;
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~BillboardBatch();
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bool loadTexture(const std::string& path) { return texture.load(path); }
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void upload(); // call after editing `instances`
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void draw() const;
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// Texture the renderer binds: `sharedTexture` if set, else `texture`.
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const Texture& tex() const { return sharedTexture ? *sharedTexture : texture; }
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// World size that keeps the own `texture` at `pixelsPerUnit` texel density.
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glm::vec2 sizeForDensity(float pixelsPerUnit) const {
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return glm::vec2(texture.size()) / pixelsPerUnit;
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}
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// World size of one `cellPixels` sheet frame / atlas cell at `pixelsPerUnit`.
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static glm::vec2 cellSize(glm::ivec2 cellPixels, float pixelsPerUnit) {
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return glm::vec2(cellPixels) / pixelsPerUnit;
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}
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Texture texture;
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const Texture* sharedTexture = nullptr; // not owned; must outlive the batch's use
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std::vector<BillboardInstance> instances;
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bool castShadows = true;
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bool inReflections = true;
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float emissive = 0.0f; // unlit contribution, for glowing sprites
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private:
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GLuint vao_ = 0, vbo_ = 0;
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size_t capacity_ = 0;
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GLsizei count_ = 0;
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};
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} // namespace hd2d
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