demo buggy heightmap

demo/src/states/game/terrain/heightmap.cpp

@@ -0,0 +1,110 @@
+/*
+# ______       ____   ___
+#   |     \/   ____| |___|
+#   |     |   |   \  |   |
+#-----------------------------------------------------------------------
+# Copyright 2022, tyra - https://github.com/h4570/tyra
+# Licenced under Apache License 2.0
+# Sandro Sobczyński <sandro.sobczynski@gmail.com>
+*/
+
+#include "states/game/terrain/heightmap.hpp"
+#include "file/file_utils.hpp"
+#include "debug/debug.hpp"
+
+using Tyra::FileUtils;
+using Tyra::PngLoader;
+using Tyra::PngPixel3;
+using Tyra::Vec4;
+
+namespace Demo {
+
+Heightmap::Heightmap(const float& t_minHeight, const float& t_maxHeight,
+                     const Vec4& t_leftUp, const Vec4& t_rightDown)
+    : minHeight(t_minHeight),
+      maxHeight(t_maxHeight),
+      leftUp(t_leftUp),
+      rightDown(t_rightDown) {
+  PngLoader loader;
+  auto* data =
+      loader.load(FileUtils::fromCwd("game/models/terrain/heightmap.png"));
+
+  allocateMap(data->data, data->width, data->height);
+
+  delete data;
+}
+
+Heightmap::~Heightmap() {
+  if (map) {
+    for (int i = 0; i < mapHeight; i++) {
+      delete[] map[i];
+    }
+    delete[] map;
+  }
+}
+
+const float& Heightmap::getHeightOffset(const Vec4& playerPosition) {
+  float widthPercentage = getWidthPercentage(playerPosition);
+  float heightPercentage = getHeightPercentage(playerPosition);
+
+  auto x = static_cast<s16>(widthPercentage * mapWidth);
+  auto y = static_cast<s16>(heightPercentage * mapHeight);
+
+  TYRA_ASSERT(x >= 0 && x < mapWidth, "x is out of range");
+  TYRA_ASSERT(y >= 0 && y < mapHeight, "y is out of range");
+
+  return map[x][y];
+}
+
+float Heightmap::getWidthPercentage(const Vec4& playerPosition) {
+  return (playerPosition.x - leftUp.x) / (rightDown.x - leftUp.x);
+}
+
+float Heightmap::getHeightPercentage(const Vec4& playerPosition) {
+  return (playerPosition.z - leftUp.z) / (rightDown.z - leftUp.z);
+}
+
+void Heightmap::allocateMap(const unsigned char* data, const int& width,
+                            const int& height) {
+  auto* pixels = (struct PngPixel3*)data;
+
+  u8 min = pixels[0].r;  // in grayscale every r,g,b is the same
+  u8 max = pixels[0].r;
+
+  // Get min and max
+  for (int i = 0; i < width * height; i++) {
+    const auto& value = pixels[i].r;
+    if (value < min) {
+      min = value;
+    }
+    if (value > max) {
+      max = value;
+    }
+  }
+
+  // Allocate
+  mapWidth = width;
+  mapHeight = height;
+  map = new float*[width];
+  for (int i = 0; i < width; i++) {
+    map[i] = new float[height];
+  }
+
+  // Fill
+  int k = 0;
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      map[i][j] = getGameHeight(pixels[k++].r, min, max);
+    }
+  }
+}
+
+float Heightmap::getGameHeight(const u8& inputColor, const u8& minColor,
+                               const u8& maxColor) {
+  const float mapRange = maxColor - minColor;
+  const float gameRange = maxHeight - minHeight;
+
+  return (inputColor - minColor) / mapRange * gameRange + minHeight;
+}
+
+}  // namespace Demo

demo/src/states/game/terrain/terrain.cpp

@@ -16,8 +16,12 @@ using Tyra::FileUtils;
 using Tyra::TyrobjLoader;
 
 namespace Demo {
-
-Terrain::Terrain(TextureRepository* repo) {
+Terrain::Terrain(TextureRepository* repo)
+    : heightmap(-5.0F,                               // Min height
+                70.0F,                               // Max height
+                Vec4(-196.6F, 0.0F, -412.0F, 1.0F),  // Left up
+                Vec4(286.0F, 0.0F, 443.3F, 1.0F)     // Right down
+      ) {
   TyrobjLoader loader;
   auto* data = loader.load(
       FileUtils::fromCwd("game/models/terrain/terrain.obj"), 1, 25.0F, true);
@@ -35,14 +39,8 @@ Terrain::Terrain(TextureRepository* repo) {
   pair = new RendererStaticPair{mesh, options};
 }
 
-// float testRotation = 0.0F;
-
-void Terrain::update() {
-  // testRotation += 0.001F;
-  mesh->rotation.identity();
-  mesh->rotation.rotateZ(0.1F);
-  mesh->rotation.rotateY(-4.3F);
-  // TYRA_LOG(testRotation);
+float Terrain::getHeightOffset(const Vec4& playerPosition) {
+  return heightmap.getHeightOffset(playerPosition);
 }
 
 Terrain::~Terrain() {