//-------------------------------------------------------------------------------------------------
DisplayList::DisplayList(const VertexBuffer &vertexBuffer, const IndexBuffer &indexBuffer, const Texture &texture)
{
List<u8> commands;
List<u32> commandData;
commands.push_back(FIFO_BEGIN);
commandData.push_back(GL_TRIANGLES);
for(int i = 0; i < indexBuffer.IndexCount(); ++i)
{
u16 index = indexBuffer[i];
auto& v = vertexBuffer[index];
// Add texture coordinates
commands.push_back(FIFO_TEX_COORD);
fx4 tu = v.U * texture.Width;
fx4 tv = v.V * texture.Height;
commandData.push_back(TEXTURE_PACK(tof16(tu), tof16(tv)));
// Add normal data
commands.push_back(FIFO_NORMAL);
commandData.push_back(v.Normal);
// Add positional data
commands.push_back(FIFO_VERTEX16);
commandData.push_back(v.XY);
commandData.push_back(v.Z);
}
// Synthesize the display list
int dataCounter = 0;
int commandCount = commands.size();
// First entry is the size of the display list
int packedCommandCount = commands.size() / 4; // 1 display list entry per 4 packed commands
packedCommandCount += (commands.size() % 4 == 0) ? 0 : 1; // If the last packed command is padded, add 1 more
displayList.push_back(packedCommandCount + commandData.size());
for(int i = 0; i < commandCount; i+=4)
{
int remaining = commandCount - i;
u32 packedFifoCommand = 0;
switch(remaining)
{
case 1: packedFifoCommand = FIFO_COMMAND_PACK(commands[i], FIFO_NOP, FIFO_NOP, FIFO_NOP); break;
case 2: packedFifoCommand = FIFO_COMMAND_PACK(commands[i], commands[i+1], FIFO_NOP, FIFO_NOP); break;
case 3: packedFifoCommand = FIFO_COMMAND_PACK(commands[i], commands[i+1], commands[i+2], FIFO_NOP); break;
default: packedFifoCommand = FIFO_COMMAND_PACK(commands[i], commands[i+1], commands[i+2], commands[i+3]); break;
}
displayList.push_back(packedFifoCommand);
// Add the command data
for(int j = 0; j < 4 && j < remaining; ++j)
{
u8 command = commands[i + j];
switch(command)
{
case FIFO_TEX_COORD: displayList.push_back(commandData[dataCounter++]); break;
case FIFO_NORMAL: displayList.push_back(commandData[dataCounter++]); break;
case FIFO_VERTEX16: displayList.push_back(commandData[dataCounter++]);
displayList.push_back(commandData[dataCounter++]); break;
case FIFO_BEGIN: displayList.push_back(commandData[dataCounter++]); break;
default: CRASH("Invalid command specified in display list"); break;
}
}
}
ASSERT(displayList[0] == displayList.size() - 1, "Display list size does not packed command count + data size");
ASSERT(displayList[2] == GL_TRIANGLES, "Something went wrong (1)");
ASSERT(dataCounter == (int)commandData.size(), "Something went wrong (2)");
}
