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-rw-r--r--game/terrain.cpp87
-rw-r--r--game/terrain.h37
2 files changed, 124 insertions, 0 deletions
diff --git a/game/terrain.cpp b/game/terrain.cpp
new file mode 100644
index 0000000..1669a62
--- /dev/null
+++ b/game/terrain.cpp
@@ -0,0 +1,87 @@
+#include "terrain.h"
+#include "gfx/models/texture.h"
+#include <array>
+#include <cache.h>
+#include <cstddef>
+#include <gfx/gl/shader.h>
+#include <gfx/gl/transform.h>
+#include <gfx/models/vertex.hpp>
+#include <glm/glm.hpp>
+
+constexpr auto size {255}; // Vertices
+constexpr auto verticesCount = size * size;
+constexpr auto tilesCount = (size - 1) * (size - 1);
+constexpr auto trianglesCount = tilesCount * 2;
+constexpr auto indicesCount = trianglesCount * 3;
+constexpr auto resolution = 10; // Grid size
+
+Terrain::Terrain() :
+ m_vertexArrayObject {}, m_vertexArrayBuffers {}, texture {Texture::cachedTexture.get("res/bricks.jpg")}
+{
+ vertices.resize(verticesCount, {{}, {}, {}});
+ indices.reserve(indicesCount);
+
+ // Initial coordinates
+ for (auto z = 0; z < size; z += 1) {
+ for (auto x = 0; x < size; x += 1) {
+ auto & vertex = vertices[x + (z * size)];
+ vertex.pos = {resolution * x, -1, resolution * z};
+ vertex.normal = {0, 1, 0};
+ vertex.texCoord = {x % 2, z % 2};
+ }
+ }
+ // Indices
+ for (auto z = 0; z < size - 1; z += 1) {
+ for (auto x = 0; x < size - 1; x += 1) {
+ indices.push_back(x + (z * size));
+ indices.push_back((x + 1) + ((z + 1) * size));
+ indices.push_back((x + 1) + (z * size));
+ indices.push_back(x + (z * size));
+ indices.push_back(x + ((z + 1) * size));
+ indices.push_back((x + 1) + ((z + 1) * size));
+ }
+ }
+
+ glGenVertexArrays(1, &m_vertexArrayObject);
+ glBindVertexArray(m_vertexArrayObject);
+
+ glGenBuffers(2, m_vertexArrayBuffers.data());
+
+ glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffers[0]);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(Vertex) * verticesCount, vertices.data(), GL_STATIC_DRAW);
+
+ glEnableVertexAttribArray(0);
+ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, pos));
+
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, texCoord));
+
+ glEnableVertexAttribArray(2);
+ glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, normal));
+
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vertexArrayBuffers[1]);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices[0]) * indicesCount, indices.data(), GL_STATIC_DRAW);
+
+ glBindVertexArray(0);
+}
+
+Terrain::~Terrain()
+{
+ glDeleteBuffers(NUM_BUFFERS, m_vertexArrayBuffers.data());
+ glDeleteVertexArrays(1, &m_vertexArrayObject);
+}
+
+static const Transform identity {};
+static const auto identityModel {identity.GetModel()};
+
+void
+Terrain::render(const Shader & shader) const
+{
+ shader.setModel(identityModel);
+ texture->Bind();
+ glBindVertexArray(m_vertexArrayObject);
+
+ glDrawElementsBaseVertex(GL_TRIANGLES, indicesCount, GL_UNSIGNED_INT, nullptr, 0);
+
+ glBindVertexArray(0);
+}
diff --git a/game/terrain.h b/game/terrain.h
new file mode 100644
index 0000000..4db99c5
--- /dev/null
+++ b/game/terrain.h
@@ -0,0 +1,37 @@
+#ifndef TERRAIN_H
+#define TERRAIN_H
+
+#include "worldobject.h"
+#include <GL/glew.h>
+#include <array>
+#include <gfx/models/vertex.hpp>
+#include <gfx/renderable.h>
+#include <memory>
+#include <special_members.hpp>
+#include <vector>
+
+class Shader;
+class Texture;
+
+class Terrain : public WorldObject, public Renderable {
+public:
+ Terrain();
+ ~Terrain() override;
+ NO_COPY(Terrain);
+ NO_MOVE(Terrain);
+
+ void render(const Shader & shader) const override;
+
+ void tick(TickDuration) override { }
+
+private:
+ static constexpr unsigned int NUM_BUFFERS {4};
+
+ GLuint m_vertexArrayObject;
+ std::array<GLuint, NUM_BUFFERS> m_vertexArrayBuffers;
+ std::vector<Vertex> vertices;
+ std::vector<unsigned int> indices;
+ std::shared_ptr<Texture> texture;
+};
+
+#endif