lovr/src/modules/graphics/graphics.c

#include "graphics/graphics.h"
#include "core/gpu.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>

struct Buffer {
  uint32_t ref;
  uint32_t size;
  gpu_buffer* gpu;
  BufferInfo info;
};

static struct {
  bool initialized;
  gpu_device_info device;
  gpu_features features;
  gpu_limits limits;
} state;

// Helpers

static void onMessage(void* context, const char* message, bool severe);

// Entry

bool lovrGraphicsInit(bool debug) {
  if (state.initialized) return false;

  gpu_config config = {
    .debug = debug,
    .callback = onMessage,
    .device = &state.device,
    .features = &state.features,
    .limits = &state.limits
  };

  if (!gpu_init(&config)) {
    lovrThrow("Failed to initialize GPU");
  }

  state.initialized = true;
  return true;
}

void lovrGraphicsDestroy() {
  if (!state.initialized) return;
  gpu_destroy();
  memset(&state, 0, sizeof(state));
}

void lovrGraphicsGetDevice(GraphicsDevice* device) {
  device->deviceId = state.device.deviceId;
  device->vendorId = state.device.vendorId;
  device->name = state.device.deviceName;
  device->renderer = state.device.renderer;
  device->subgroupSize = state.device.subgroupSize;
  device->discrete = state.device.discrete;
}

void lovrGraphicsGetFeatures(GraphicsFeatures* features) {
  features->textureBC = state.features.textureBC;
  features->textureASTC = state.features.textureASTC;
  features->wireframe = state.features.wireframe;
  features->depthClamp = state.features.depthClamp;
  features->indirectDrawFirstInstance = state.features.indirectDrawFirstInstance;
  features->float64 = state.features.float64;
  features->int64 = state.features.int64;
  features->int16 = state.features.int16;
}

void lovrGraphicsGetLimits(GraphicsLimits* limits) {
  limits->textureSize2D = state.limits.textureSize2D;
  limits->textureSize3D = state.limits.textureSize3D;
  limits->textureSizeCube = state.limits.textureSizeCube;
  limits->textureLayers = state.limits.textureLayers;
  limits->renderSize[0] = state.limits.renderSize[0];
  limits->renderSize[1] = state.limits.renderSize[1];
  limits->renderSize[2] = state.limits.renderSize[2];
  limits->uniformBufferRange = state.limits.uniformBufferRange;
  limits->storageBufferRange = state.limits.storageBufferRange;
  limits->uniformBufferAlign = state.limits.uniformBufferAlign;
  limits->storageBufferAlign = state.limits.storageBufferAlign;
  limits->vertexAttributes = state.limits.vertexAttributes;
  limits->vertexBufferStride = state.limits.vertexBufferStride;
  limits->vertexShaderOutputs = state.limits.vertexShaderOutputs;
  limits->clipDistances = state.limits.clipDistances;
  limits->cullDistances = state.limits.cullDistances;
  limits->clipAndCullDistances = state.limits.clipAndCullDistances;
  memcpy(limits->computeDispatchCount, state.limits.computeDispatchCount, 3 * sizeof(uint32_t));
  memcpy(limits->computeWorkgroupSize, state.limits.computeWorkgroupSize, 3 * sizeof(uint32_t));
  limits->computeWorkgroupVolume = state.limits.computeWorkgroupVolume;
  limits->computeSharedMemory = state.limits.computeSharedMemory;
  limits->shaderConstantSize = state.limits.pushConstantSize;
  limits->indirectDrawCount = state.limits.indirectDrawCount;
  limits->instances = state.limits.instances;
  limits->anisotropy = state.limits.anisotropy;
  limits->pointSize = state.limits.pointSize;
}

// Buffer

Buffer* lovrBufferCreate(BufferInfo* info, void** data) {
  uint32_t size = info->length * MAX(info->stride, 1);
  lovrCheck(size > 0, "Buffer size can not be zero");
  lovrCheck(size <= 1 << 30, "Max buffer size is 1GB");

  Buffer* buffer = calloc(1, sizeof(Buffer) + gpu_sizeof_buffer());
  lovrAssert(buffer, "Out of memory");
  buffer->ref = 1;
  buffer->size = size;
  buffer->gpu = (gpu_buffer*) (buffer + 1);
  buffer->info = *info;

  gpu_buffer_init(buffer->gpu, &(gpu_buffer_info) {
    .size = buffer->size,
    .label = info->label,
    .pointer = data
  });

  return buffer;
}

void lovrBufferDestroy(void* ref) {
  Buffer* buffer = ref;
  gpu_buffer_destroy(buffer->gpu);
  free(buffer);
}

const BufferInfo* lovrBufferGetInfo(Buffer* buffer) {
  return &buffer->info;
}

// Helpers

static void onMessage(void* context, const char* message, bool severe) {
  if (severe) {
    lovrLog(LOG_ERROR, "GPU", message);
  } else {
    lovrLog(LOG_DEBUG, "GPU", message);
  }
}