328 lines
11 KiB
C++
328 lines
11 KiB
C++
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "glad/gl.h"
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#include "directxmath/directxmath.h"
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#include "opengl.h"
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#include "file.h"
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#include "view.h"
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#include "minecraft.h"
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#include "minecraft_data.inc"
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namespace minecraft {
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struct location {
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struct {
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unsigned int position;
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unsigned int normal;
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unsigned int texture;
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unsigned int block_position;
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unsigned int block_id;
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unsigned int data;
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} attrib;
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struct {
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unsigned int transform;
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unsigned int terrain_sampler;
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unsigned int texture_id;
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} uniform;
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struct {
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unsigned int texture_id;
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} binding;
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};
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static unsigned int program;
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static location location;
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struct char_tpl {
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const char * vtx;
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const char * cfg;
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};
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static const int region_count = 4;
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static const char_tpl vertex_paths[] = {
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{ "minecraft/region.0.0.instance.vtx", "minecraft/region.0.0.instance.cfg" },
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{ "minecraft/region.-1.0.instance.vtx", "minecraft/region.-1.0.instance.cfg" },
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{ "minecraft/region.0.-1.instance.vtx", "minecraft/region.0.-1.instance.cfg" },
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{ "minecraft/region.-1.-1.instance.vtx", "minecraft/region.-1.-1.instance.cfg" },
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};
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static unsigned int vertex_array_object;
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static unsigned int per_instance_vertex_buffers[region_count];
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static unsigned int per_vertex_buffer;
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static const int per_instance_size = 4 + (1 * 4);
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static const int per_vertex_size = (3 + 3 + 2) * 2;
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static unsigned int index_buffer;
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// also update index_buffer_custom_offsets in data.inc
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static const int custom_block_types = 5;
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static const int instance_cfg_length = 64 + custom_block_types;
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struct instance_cfg {
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struct region_instance {
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int instance_count;
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int offset;
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} cfg[instance_cfg_length];
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};
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static instance_cfg instance_cfg[region_count];
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static unsigned int texture;
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static unsigned int texture_id_uniform_buffer;
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void load_program()
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{
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program = compile_from_files("shader/minecraft.vert",
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NULL,
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"shader/minecraft.frag");
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location.attrib.position = glGetAttribLocation(program, "Position");
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location.attrib.normal = glGetAttribLocation(program, "Normal");
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location.attrib.texture = glGetAttribLocation(program, "Texture");
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location.attrib.block_position = glGetAttribLocation(program, "BlockPosition");
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location.attrib.block_id = glGetAttribLocation(program, "BlockID");
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location.attrib.data = glGetAttribLocation(program, "Data");
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printf("minecraft program:\n");
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printf(" attributes:\n position %u\n normal %u\n texture %u\n block_position %u\n block_id %u\n data %u\n",
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location.attrib.position,
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location.attrib.normal,
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location.attrib.texture,
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location.attrib.block_position,
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location.attrib.block_id,
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location.attrib.data);
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location.uniform.transform = glGetUniformLocation(program, "Transform");
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location.uniform.terrain_sampler = glGetUniformLocation(program, "TerrainSampler");
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location.uniform.texture_id = glGetUniformBlockIndex(program, "TextureID");
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printf(" uniforms:\n transform %u\n terrain_sampler %u\n texture_id %u\n",
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location.uniform.transform,
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location.uniform.terrain_sampler,
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location.uniform.texture_id);
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location.binding.texture_id = 0;
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glUniformBlockBinding(program, location.uniform.texture_id, location.binding.texture_id);
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}
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void load_vertex_attributes()
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{
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glGenVertexArrays(1, &vertex_array_object);
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glBindVertexArray(vertex_array_object);
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glVertexBindingDivisor(0, 0);
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glVertexBindingDivisor(1, 1);
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glEnableVertexAttribArray(location.attrib.position);
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glVertexAttribFormat(location.attrib.position, 3, GL_HALF_FLOAT, GL_FALSE, 0);
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glVertexAttribBinding(location.attrib.position, 0);
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glEnableVertexAttribArray(location.attrib.normal);
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glVertexAttribFormat(location.attrib.normal, 3, GL_HALF_FLOAT, GL_FALSE, 6);
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glVertexAttribBinding(location.attrib.normal, 0);
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glEnableVertexAttribArray(location.attrib.texture);
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glVertexAttribFormat(location.attrib.texture, 2, GL_HALF_FLOAT, GL_FALSE, 12);
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glVertexAttribBinding(location.attrib.texture, 0);
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glEnableVertexAttribArray(location.attrib.block_position);
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glVertexAttribFormat(location.attrib.block_position, 3, GL_SHORT, GL_FALSE, 0);
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glVertexAttribBinding(location.attrib.block_position, 1);
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glEnableVertexAttribArray(location.attrib.block_id);
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glVertexAttribFormat(location.attrib.block_id, 1, GL_UNSIGNED_BYTE, GL_FALSE, 6);
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glVertexAttribBinding(location.attrib.block_id, 1);
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glEnableVertexAttribArray(location.attrib.data);
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glVertexAttribFormat(location.attrib.data, 1, GL_UNSIGNED_BYTE, GL_FALSE, 7);
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glVertexAttribBinding(location.attrib.data, 1);
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glBindVertexArray(0);
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}
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void load_per_instance_vertex_buffer(int i)
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{
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int vertex_buffer_data_size;
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void * vertex_buffer_data = read_file(vertex_paths[i].vtx, &vertex_buffer_data_size);
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glBindBuffer(GL_ARRAY_BUFFER, per_instance_vertex_buffers[i]);
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glBufferData(GL_ARRAY_BUFFER, vertex_buffer_data_size, vertex_buffer_data, GL_STATIC_DRAW);
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free(vertex_buffer_data);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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}
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void load_per_vertex_buffer()
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{
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glGenBuffers(1, &per_vertex_buffer);
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int vertex_buffer_data_size;
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void * vertex_buffer_data = read_file("minecraft/per_vertex.vtx", &vertex_buffer_data_size);
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glBindBuffer(GL_ARRAY_BUFFER, per_vertex_buffer);
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glBufferData(GL_ARRAY_BUFFER, vertex_buffer_data_size, vertex_buffer_data, GL_STATIC_DRAW);
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free(vertex_buffer_data);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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}
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void load_index_buffer()
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{
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glGenBuffers(1, &index_buffer);
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int index_buffer_data_size;
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void * index_buffer_data = read_file("minecraft/configuration.idx", &index_buffer_data_size);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, index_buffer_data_size, index_buffer_data, GL_STATIC_DRAW);
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free(index_buffer_data);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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}
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void load_instance_cfg(int i)
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{
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int data_size;
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void * data = read_file(vertex_paths[i].cfg, &data_size);
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assert(data_size == (sizeof (struct instance_cfg)));
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memcpy(&instance_cfg[i], data, data_size);
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}
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void load_texture()
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{
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glGenTextures(1, &texture);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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int texture_data_size;
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void * texture_data = read_file("minecraft/terrain.data", &texture_data_size);
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assert(texture_data != NULL);
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int width = 256;
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int height = 256;
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture_data);
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free(texture_data);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void load_texture_id_uniform_buffer()
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{
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texture_id_uniform_buffer = load_uniform_buffer("minecraft/block_id_to_texture_id.data");
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}
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void load()
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{
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//////////////////////////////////////////////////////////////////////
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// program
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//////////////////////////////////////////////////////////////////////
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load_program();
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load_vertex_attributes();
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//////////////////////////////////////////////////////////////////////
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// vertex/index buffers
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//////////////////////////////////////////////////////////////////////
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// per-vertex buffer
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load_per_vertex_buffer();
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// per-instance buffer
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glGenBuffers(region_count, per_instance_vertex_buffers);
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for (int i = 0; i < region_count; i++) {
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load_per_instance_vertex_buffer(i);
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load_instance_cfg(i);
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}
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// index buffer
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load_index_buffer();
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//////////////////////////////////////////////////////////////////////
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// textures
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//////////////////////////////////////////////////////////////////////
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load_texture();
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//////////////////////////////////////////////////////////////////////
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// uniform buffers
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//////////////////////////////////////////////////////////////////////
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load_texture_id_uniform_buffer();
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}
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static inline int popcount(int x)
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{
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return __builtin_popcount(x);
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}
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void draw()
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{
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glUseProgram(program);
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glBlendFunc(GL_ONE, GL_ZERO);
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_GREATER);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture);
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glUniformMatrix4fv(location.uniform.transform, 1, false, (float *)&view::state.float_transform);
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glUniform1i(location.uniform.terrain_sampler, 0);
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glBindBufferBase(GL_UNIFORM_BUFFER, location.binding.texture_id, texture_id_uniform_buffer);
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//glEnable(GL_CULL_FACE);
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//glCullFace(GL_FRONT);
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//glFrontFace(GL_CCW);
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glBindVertexArray(vertex_array_object);
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glBindVertexBuffer(0, per_vertex_buffer, 0, per_vertex_size);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer);
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for (int region_index = 0; region_index < region_count; region_index++) {
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glBindVertexBuffer(1, per_instance_vertex_buffers[region_index], 0, per_instance_size);
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//////////////////////////////////////////////////////////////////////
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// cube blocks
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//////////////////////////////////////////////////////////////////////
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for (int configuration = 1; configuration < 64; configuration++) {
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int element_count = 6 * popcount(configuration);
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const void * indices = (void *)(2 * (ptrdiff_t)index_buffer_configuration_offsets[configuration]); // index into configuration.idx
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int instance_count = instance_cfg[region_index].cfg[configuration].instance_count;
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int base_instance = instance_cfg[region_index].cfg[configuration].offset / per_instance_size; // index into region.0.0.instance.vtx
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if (instance_count == 0)
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continue;
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glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_SHORT, indices, instance_count, base_instance);
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}
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//////////////////////////////////////////////////////////////////////
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// custom blocks
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//////////////////////////////////////////////////////////////////////
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for (int i = 0; i < custom_block_types; i++) {
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int element_count = index_buffer_custom_offsets[i].count;
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const void * indices = (void *)(2 * (ptrdiff_t)index_buffer_custom_offsets[i].offset);
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int instance_count = instance_cfg[region_index].cfg[64 + i].instance_count;
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int base_instance = instance_cfg[region_index].cfg[64 + i].offset / per_instance_size; // index into region.0.0.instance.vtx
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if (instance_count == 0)
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continue;
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glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_SHORT, indices, instance_count, base_instance);
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}
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}
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}
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}
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