From f8b92ce3aa08b1445c9f956d8166830946562d12 Mon Sep 17 00:00:00 2001
From: navewindre <boneyaard@gmail.com>
Date: Wed, 3 Sep 2025 20:10:09 +0200
Subject: a

---
 src/render/gl_3d.h | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/render/gl_3d.h

(limited to 'src/render/gl_3d.h')

diff --git a/src/render/gl_3d.h b/src/render/gl_3d.h
new file mode 100644
index 0000000..531c3a3
--- /dev/null
+++ b/src/render/gl_3d.h
@@ -0,0 +1,69 @@
+#pragma once
+#include "gl_batch.h"
+#include "../util/matrix.h"
+
+// magic number sue me. yes this float is representable exactly.
+const F32 SCREEN_INVALID_POS = -2137000.f;
+
+struct VERTEX3D {
+  VEC3 pos;
+  VEC2 uv;
+  CLR clr;
+  U8 sampler;
+};
+
+using GL_BATCH3D = GL_BATCH<VERTEX3D>;
+struct GL_3D : GL_SHADER_PROGRAM {
+  F32 aspect;
+  MAT4 projmat;
+
+  VEC2 winsize;
+};
+
+// shader init -----------------------------------------------------------
+extern GL_3D* gl_3d_init( GL_DATA* gl, VEC2 screensize, const char* shadername );
+// sets up projection matrix and sends it to the gpu ------------------------------------------------------------
+extern void gl_3d_projection_setup( GL_SHADER_PROGRAM* gl3d, VEC3 pos, F32 fov_deg, F32 yaw, F32 pitch, F32 near, F32 far, VEC2 winsize );
+extern void gl_3d_batch_setup( GL_BATCH3D* batch );
+
+// takes a triangle fan not set of triangles
+extern void gl_3d_polygon(
+  GL_SHADER_PROGRAM* gl3d,
+  VERTEX3D* vertices,
+  U32 vertices_count,
+  GL_TEX2D* tex
+);
+
+// calculates triangle set from triangle fan before sending to batch
+extern void gl_3d_polygon_fan(
+  GL_BATCH3D* batch,
+  VERTEX3D* vertices,
+  U32 vertices_count,
+  GL_TEX2D* tex
+);
+
+// draws a set of triangles
+extern void gl_3d_polygon(
+  GL_BATCH3D* batch,
+  VERTEX3D* vertices,
+  U32 vertices_count,
+  GL_TEX2D* tex
+);
+
+extern void gl_3d_plane(
+  GL_SHADER_PROGRAM* gl3d,
+  VEC3 pos,
+  VEC2 size,
+  VEC2 rot,
+  GL_TEX2D* tex,
+  CLR col = CLR::WHITE()
+);
+
+extern void gl_3d_plane(
+  GL_BATCH3D* batch,
+  VEC3 pos,
+  VEC2 size,
+  VEC2 rot,
+  GL_TEX2D* tex,
+  CLR col = CLR::WHITE()
+);
-- 
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