44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
#pragma once
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// sprite_batch — batched textured quad renderer on top of sokol_gfx.
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// Single draw call per atlas binding. Issue 0072b runtime gamedev.
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#include "sokol_gfx.h"
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#include "math2d.h"
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namespace fn::gfx {
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struct SpriteBatch {
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sg_pipeline pipeline{};
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sg_buffer vbo{};
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sg_view current_view{}; // texture view bound this batch
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sg_sampler sampler{};
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void* cpu_buffer = nullptr; // Vertex* on heap
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int cpu_capacity_quads = 0;
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int cpu_count_quads = 0;
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float proj[16]{}; // current view-proj matrix (column-major)
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bool in_pass = false;
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bool ok = false;
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};
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// Create the batcher. Allocates CPU buffer + sokol resources. cpu_capacity_quads
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// caps the per-flush quads (auto-flush when reached). Default 4096.
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SpriteBatch sprite_batch_create(int cpu_capacity_quads = 4096);
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void sprite_batch_destroy(SpriteBatch& b);
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// Begin a batch with a column-major 4x4 view-projection.
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// Call between sg_begin_pass and sg_end_pass.
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void sprite_batch_begin(SpriteBatch& b, const float view_proj_col_major[16]);
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// Queue one textured quad. dst is the screen rect. src is the UV rect inside the
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// texture, in pixels (0..image_size). tint multiplies the texture sample.
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// view must be a sg_view created with sg_make_view({.texture.image = ...}).
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void sprite_batch_draw(SpriteBatch& b, sg_view view, int img_w, int img_h,
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fn::math2d::Rect src, fn::math2d::Rect dst,
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fn::math2d::Color tint = fn::math2d::Color::white());
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// Flush remaining quads.
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void sprite_batch_end(SpriteBatch& b);
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} // namespace fn::gfx
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