From edcde03fa325b36426f874b06b208bb383f97cbc Mon Sep 17 00:00:00 2001
From: Miloslav Ciz <drummyfish@disroot.org>
Date: Sat, 16 Sep 2023 20:35:01 +0200
Subject: [PATCH] Start 3D rendering

---
 game.h     |  4 ++++
 renderer.h | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 settings.h | 11 ++++++++++
 3 files changed, 74 insertions(+)

diff --git a/game.h b/game.h
index 72360ab..585d8ef 100644
--- a/game.h
+++ b/game.h
@@ -113,6 +113,8 @@ void LCR_gameInit(void)
 {
   for (int i = 0; i < LCR_KEYS_TOTAL; ++i)
     _LCR_keyStates[i] = 0;
+
+  LCR_rendererInit();
 }
 
 void LCR_gameEnd(void)
@@ -136,6 +138,8 @@ for (int i = 0; i < LCR_EFFECTIVE_RESOLUTION_X; ++i)
 LCR_drawBackground(200 + aaa / 10);
 LCR_drawSkyStrip(200 + aaa / 10,aaa / 30);
 
+LCR_render();
+
 
 aaa = (aaa + 1) % 10000;
 
diff --git a/renderer.h b/renderer.h
index 2c49ddf..8852669 100644
--- a/renderer.h
+++ b/renderer.h
@@ -1,11 +1,70 @@
 #ifndef _LCR_RENDERER_H
 #define _LCR_RENDERER_H
 
+#define S3L_RESOLUTION_X LCR_SETTING_RESOLUTION_X
+#define S3L_RESOLUTION_Y LCR_SETTING_RESOLUTION_Y
+#define S3L_PIXEL_FUNCTION LCR_pixelFunc3D
+
+#include "small3dlib.h"
+
 struct LCR_Renderer
 {
   // TODO
 };
 
+S3L_Scene LCR_scene3D;
+S3L_Model3D LCR_models3D[3]; // TODO
+
+S3L_Unit LCR_vertices3D[LCR_SETTING_MAX_VERTICES * 3];
+S3L_Index LCR_triangles3D[LCR_SETTING_MAX_TRIANGLES * 3];
+
+void LCR_pixelFunc3D(S3L_PixelInfo *pixel)
+{
+  LCR_drawPixelSafe(pixel->x,pixel->y,0xff00);
+}
+
+/** Builds an internal 3D model of the currently loaded map. Returns 1 on
+  success, otherwise 0 (e.g. not enough space). */
+uint8_t LCR_buildMapModel(void)
+{
+  // TODO
+
+  LCR_vertices3D[0] = -400;
+  LCR_vertices3D[1] = -100;
+  LCR_vertices3D[2] = 1000;
+
+  LCR_vertices3D[3] = 400;
+  LCR_vertices3D[4] = -100;
+  LCR_vertices3D[5] = 1000;
+
+  LCR_vertices3D[6] = 0;
+  LCR_vertices3D[7] = 400;
+  LCR_vertices3D[8] = 1000;
+
+  LCR_triangles3D[0] = 0;
+  LCR_triangles3D[1] = 1;
+  LCR_triangles3D[2] = 2;
+
+  return 1;
+}
+
+uint8_t LCR_rendererInit(void)
+{
+  if (!LCR_buildMapModel())
+    return 0;
+
+  S3L_model3DInit(LCR_vertices3D,3,LCR_triangles3D,1,LCR_models3D);
+  S3L_sceneInit(LCR_models3D,1,&LCR_scene3D);
+
+  return 1;
+}
+
+void LCR_render(void)
+{
+  S3L_newFrame();
+  S3L_drawScene(LCR_scene3D);
+}
+
 void LCR_drawBackground(int verticalOffset)
 {
   uint16_t color = LCR_skyImages[LCR_skyImages[256] & 0x00ff]  ; // TODO
diff --git a/settings.h b/settings.h
index 8df1561..2ade85f 100644
--- a/settings.h
+++ b/settings.h
@@ -13,6 +13,17 @@
   #define LCR_SETTING_RESOLUTION_SUBDIVIDE 1
 #endif
 
+#ifndef LCR_SETTING_MAX_VERTICES
+  /** Maximum number of vertices for 3D rendering. Lower number will decrease
+  RAM usage but will prevent larger maps from being loaded. */
+  #define LCR_SETTING_MAX_VERTICES 10000
+#endif
+
+#ifndef LCR_SETTING_MAX_TRIANGLES
+  /** Like LCR_SETTING_MAX_VERTICES but for the number of triangles. */
+  #define LCR_SETTING_MAX_TRIANGLES 10000
+#endif
+
 #ifndef LCR_SETTING_SKY_SIZE
   /** Size of sky texture pixel, 0 turns off sky rendering. */
   #define LCR_SETTING_SKY_SIZE \