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-rw-r--r--src/graphics/RenderSection.cpp281
1 files changed, 281 insertions, 0 deletions
diff --git a/src/graphics/RenderSection.cpp b/src/graphics/RenderSection.cpp
new file mode 100644
index 0000000..fec67b5
--- /dev/null
+++ b/src/graphics/RenderSection.cpp
@@ -0,0 +1,281 @@
+#include <graphics/RenderSection.hpp>
+
+const GLfloat vertices[] = {
+ //Z+ edge
+ -0.5f, 0.5f, 0.5f,
+ -0.5f, -0.5f, 0.5f,
+ 0.5f, -0.5f, 0.5f,
+ -0.5f, 0.5f, 0.5f,
+ 0.5f, -0.5f, 0.5f,
+ 0.5f, 0.5f, 0.5f,
+
+ //Z- edge
+ -0.5f, -0.5f, -0.5f,
+ -0.5f, 0.5f, -0.5f,
+ 0.5f, -0.5f, -0.5f,
+ 0.5f, -0.5f, -0.5f,
+ -0.5f, 0.5f, -0.5f,
+ 0.5f, 0.5f, -0.5f,
+
+ //X+ edge
+ -0.5f, -0.5f, -0.5f,
+ -0.5f, -0.5f, 0.5f,
+ -0.5f, 0.5f, -0.5f,
+ -0.5f, 0.5f, -0.5f,
+ -0.5f, -0.5f, 0.5f,
+ -0.5f, 0.5f, 0.5f,
+
+ //X- edge
+ 0.5f, -0.5f, 0.5f,
+ 0.5f, 0.5f, -0.5f,
+ 0.5f, 0.5f, 0.5f,
+ 0.5f, -0.5f, 0.5f,
+ 0.5f, -0.5f, -0.5f,
+ 0.5f, 0.5f, -0.5f,
+
+ //Y+ edge
+ 0.5f, 0.5f, -0.5f,
+ -0.5f, 0.5f, 0.5f,
+ 0.5f, 0.5f, 0.5f,
+ 0.5f, 0.5f, -0.5f,
+ -0.5f, 0.5f, -0.5f,
+ -0.5f, 0.5f, 0.5f,
+
+ //Y- edge
+ -0.5f, -0.5f, 0.5f,
+ 0.5f, -0.5f, -0.5f,
+ 0.5f, -0.5f, 0.5f,
+ -0.5f, -0.5f, -0.5f,
+ 0.5f, -0.5f, -0.5f,
+ -0.5f, -0.5f, 0.5f,
+};
+
+const GLfloat uv_coords[] = {
+ //Z+
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 0.0f,
+ 0.0f, 1.0f,
+ 1.0f, 0.0f,
+ 1.0f, 1.0f,
+
+ //Z-
+ 1.0f, 0.0f,
+ 1.0f, 1.0f,
+ 0.0f, 0.0f,
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 0.0f, 1.0f,
+
+ //X+
+ 0.0f, 0.0f,
+ 1.0f, 0.0f,
+ 0.0f, 1.0f,
+ 0.0f, 1.0f,
+ 1.0f, 0.0f,
+ 1.0f, 1.0f,
+
+ //X-
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 0.0f,
+ 1.0f, 1.0f,
+
+ //Y+
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 0.0f,
+ 1.0f, 1.0f,
+
+ //Y-
+ 1.0f, 0.0f,
+ 0.0f, 1.0f,
+ 0.0f, 0.0f,
+ 1.0f, 1.0f,
+ 0.0f, 1.0f,
+ 1.0f, 0.0f,
+};
+
+void RenderState::SetActiveVao(GLuint Vao) {
+ if (Vao != ActiveVao) {
+ glBindVertexArray(Vao);
+ ActiveVao = Vao;
+ }
+}
+
+void RenderState::SetActiveShader(GLuint Shader) {
+ if (Shader != ActiveShader) {
+ glUseProgram(Shader);
+ ActiveShader = Shader;
+ }
+}
+
+const GLuint magicUniqueConstant = 88375;
+GLuint RenderSection::VboVertices = magicUniqueConstant;
+GLuint RenderSection::VboUvs = magicUniqueConstant;
+std::map<GLuint, int> RenderSection::refCounterVbo;
+std::map<GLuint, int> RenderSection::refCounterVao;
+
+
+RenderSection::RenderSection(World *world, Vector position) : sectionPosition(position), world(world) {
+
+ if (VboVertices == magicUniqueConstant) {
+ glGenBuffers(1, &VboVertices);
+ glGenBuffers(1, &VboUvs);
+
+ //Cube vertices
+ glBindBuffer(GL_ARRAY_BUFFER, VboVertices);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+ //Cube UVs
+ glBindBuffer(GL_ARRAY_BUFFER, VboUvs);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(uv_coords), uv_coords, GL_STATIC_DRAW);
+
+ LOG(INFO) << "Created VBOs with vertices (" << VboVertices << ") and UVs (" << VboUvs
+ << ") for ordinary blocks";
+ }
+
+ glGenBuffers(1, &VboBlocks);
+ if (refCounterVbo.find(VboBlocks) == refCounterVbo.end())
+ refCounterVbo[VboBlocks] = 0;
+ refCounterVbo[VboBlocks]++;
+
+ glGenBuffers(1, &VboModels);
+ if (refCounterVbo.find(VboModels) == refCounterVbo.end())
+ refCounterVbo[VboModels] = 0;
+ refCounterVbo[VboModels]++;
+
+ glGenVertexArrays(1, &Vao);
+ if (refCounterVao.find(Vao) == refCounterVao.end())
+ refCounterVao[Vao] = 0;
+ refCounterVao[Vao]++;
+
+ glBindVertexArray(Vao);
+ {
+ //Cube vertices
+ glBindBuffer(GL_ARRAY_BUFFER, VboVertices);
+ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), nullptr);
+ glEnableVertexAttribArray(0);
+
+ //Cube UVs
+ glBindBuffer(GL_ARRAY_BUFFER, VboUvs);
+ glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), nullptr);
+ glEnableVertexAttribArray(2);
+
+ //Blocks ids
+ glBindBuffer(GL_ARRAY_BUFFER, VboBlocks);
+ glVertexAttribPointer(7, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), nullptr);
+ glEnableVertexAttribArray(7);
+ glVertexAttribDivisor(7, 1);
+ glCheckError();
+
+ //Blocks models
+ size_t sizeOfMat4 = 4 * 4 * sizeof(GLfloat);
+ glBindBuffer(GL_ARRAY_BUFFER, VboModels);
+ glVertexAttribPointer(8 + 0, 4, GL_FLOAT, GL_FALSE, sizeOfMat4, nullptr);
+ glVertexAttribPointer(8 + 1, 4, GL_FLOAT, GL_FALSE, sizeOfMat4, (void *) (1 * 4 * sizeof(GLfloat)));
+ glVertexAttribPointer(8 + 2, 4, GL_FLOAT, GL_FALSE, sizeOfMat4, (void *) (2 * 4 * sizeof(GLfloat)));
+ glVertexAttribPointer(8 + 3, 4, GL_FLOAT, GL_FALSE, sizeOfMat4, (void *) (3 * 4 * sizeof(GLfloat)));
+ glEnableVertexAttribArray(8 + 0);
+ glEnableVertexAttribArray(8 + 1);
+ glEnableVertexAttribArray(8 + 2);
+ glEnableVertexAttribArray(8 + 3);
+ glVertexAttribDivisor(8 + 0, 1);
+ glVertexAttribDivisor(8 + 1, 1);
+ glVertexAttribDivisor(8 + 2, 1);
+ glVertexAttribDivisor(8 + 3, 1);
+
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+ }
+ glBindVertexArray(0);
+ UpdateState();
+ glCheckError();
+}
+
+RenderSection::~RenderSection() {
+ refCounterVbo[VboBlocks]--;
+ refCounterVbo[VboModels]--;
+ refCounterVao[Vao]--;
+ if (refCounterVbo[VboBlocks] <= 0)
+ glDeleteBuffers(1, &VboBlocks);
+ if (refCounterVbo[VboModels] <= 0)
+ glDeleteBuffers(1, &VboBlocks);
+ if (refCounterVao[Vao] <= 0)
+ glDeleteVertexArrays(1, &Vao);
+}
+
+void RenderSection::UpdateState() {
+ Section *section = &world->sections.find(sectionPosition)->second;
+ std::vector<glm::mat4> models;
+ std::vector<glm::vec2> blocks;
+ for (int y = 0; y < 16; y++) {
+ for (int z = 0; z < 16; z++) {
+ for (int x = 0; x < 16; x++) {
+ Block block = section->GetBlock(Vector(x, y, z));
+ if (block.id == 0)
+ continue;
+
+ unsigned char isVisible = 0;
+ if (x == 0 || x == 15 || y == 0 || y == 15 || z == 0 || z == 15) {
+ isVisible = 0;
+ } else {
+ isVisible |= (section->GetBlock(Vector(x + 1, y, z)).id != 0) << 0;
+ isVisible |= (section->GetBlock(Vector(x - 1, y, z)).id != 0) << 1;
+ isVisible |= (section->GetBlock(Vector(x, y + 1, z)).id != 0) << 2;
+ isVisible |= (section->GetBlock(Vector(x, y - 1, z)).id != 0) << 3;
+ isVisible |= (section->GetBlock(Vector(x, y, z + 1)).id != 0) << 4;
+ isVisible |= (section->GetBlock(Vector(x, y, z - 1)).id != 0) << 5;
+ }
+ if (isVisible == 0x3F)
+ continue;
+
+ glm::vec2 data(block.id, block.state);
+ blocks.push_back(data);
+ glm::mat4 model;
+ model = glm::translate(model, glm::vec3(section->GetPosition().GetX() * 16,
+ section->GetPosition().GetY() * 16,
+ section->GetPosition().GetZ() * 16));
+ model = glm::translate(model, glm::vec3(x, y, z));
+ double size = 0.999;
+ model = glm::scale(model, glm::vec3(size, size, size));
+ models.push_back(model);
+ }
+ }
+ }
+ glBindBuffer(GL_ARRAY_BUFFER, VboBlocks);
+ glBufferData(GL_ARRAY_BUFFER, blocks.size() * sizeof(glm::vec2), blocks.data(), GL_DYNAMIC_DRAW);
+
+ glBindBuffer(GL_ARRAY_BUFFER, VboModels);
+ glBufferData(GL_ARRAY_BUFFER, models.size() * sizeof(glm::mat4), models.data(), GL_DYNAMIC_DRAW);
+
+ glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+ numOfBlocks = blocks.size();
+}
+
+void RenderSection::Render(RenderState &state) {
+ state.SetActiveVao(Vao);
+ glDrawArraysInstanced(GL_TRIANGLES, 0, 36, numOfBlocks);
+ glCheckError();
+}
+
+Section *RenderSection::GetSection() {
+ return &world->sections.find(sectionPosition)->second;
+}
+
+RenderSection::RenderSection(const RenderSection &other) {
+ this->world = other.world;
+ this->VboModels = other.VboModels;
+ this->VboBlocks = other.VboBlocks;
+ this->sectionPosition = other.sectionPosition;
+ this->Vao = other.Vao;
+ this->numOfBlocks = other.numOfBlocks;
+
+ refCounterVbo[VboBlocks]++;
+ refCounterVbo[VboModels]++;
+ refCounterVao[Vao]++;
+}
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