mirror of
https://github.com/wheremyfoodat/Panda3DS.git
synced 2025-04-09 07:35:41 +12:00
264 lines
10 KiB
C++
264 lines
10 KiB
C++
#include "renderer_gl/textures.hpp"
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#include "colour.hpp"
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#include <array>
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using namespace Helpers;
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void Texture::allocate() {
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glGenTextures(1, &texture.m_handle);
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texture.create(size.u(), size.v(), GL_RGBA8);
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texture.bind();
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#ifdef GPU_DEBUG_INFO
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const auto name = Helpers::format("Surface %dx%d %s from 0x%08X", size.x(), size.y(), PICA::textureFormatToString(format), location);
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OpenGL::setObjectLabel(GL_TEXTURE, texture.handle(), name.c_str());
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#endif
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setNewConfig(config);
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}
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// Set the texture's configuration, which includes min/mag filters, wrapping S/T modes, and so on
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void Texture::setNewConfig(u32 cfg) {
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config = cfg;
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// The wrapping mode field is 3 bits instead of 2 bits. The bottom 4 undocumented wrapping modes are taken from Citra.
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static constexpr std::array<OpenGL::WrappingMode, 8> wrappingModes = {
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OpenGL::ClampToEdge, OpenGL::ClampToBorder, OpenGL::Repeat, OpenGL::RepeatMirrored,
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OpenGL::ClampToEdge, OpenGL::ClampToBorder, OpenGL::Repeat, OpenGL::Repeat
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};
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const auto magFilter = (cfg & 0x2) != 0 ? OpenGL::Linear : OpenGL::Nearest;
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const auto minFilter = (cfg & 0x4) != 0 ? OpenGL::Linear : OpenGL::Nearest;
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const auto wrapT = wrappingModes[getBits<8, 3>(cfg)];
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const auto wrapS = wrappingModes[getBits<12, 3>(cfg)];
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texture.setMinFilter(minFilter);
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texture.setMagFilter(magFilter);
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texture.setWrapS(wrapS);
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texture.setWrapT(wrapT);
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}
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void Texture::free() {
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valid = false;
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if (texture.exists()) {
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texture.free();
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}
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}
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u64 Texture::sizeInBytes() {
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u64 pixelCount = u64(size.x()) * u64(size.y());
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switch (format) {
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case PICA::TextureFmt::RGBA8: // 4 bytes per pixel
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return pixelCount * 4;
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case PICA::TextureFmt::RGB8: // 3 bytes per pixel
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return pixelCount * 3;
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case PICA::TextureFmt::RGBA5551: // 2 bytes per pixel
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case PICA::TextureFmt::RGB565:
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case PICA::TextureFmt::RGBA4:
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case PICA::TextureFmt::RG8:
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case PICA::TextureFmt::IA8:
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return pixelCount * 2;
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case PICA::TextureFmt::A8: // 1 byte per pixel
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case PICA::TextureFmt::I8:
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case PICA::TextureFmt::IA4:
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return pixelCount;
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case PICA::TextureFmt::I4: // 4 bits per pixel
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case PICA::TextureFmt::A4:
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return pixelCount / 2;
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case PICA::TextureFmt::ETC1: // Compressed formats
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case PICA::TextureFmt::ETC1A4: {
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// Number of 4x4 tiles
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const u64 tileCount = pixelCount / 16;
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// Tiles are 8 bytes each on ETC1 and 16 bytes each on ETC1A4
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const u64 tileSize = format == PICA::TextureFmt::ETC1 ? 8 : 16;
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return tileCount * tileSize;
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}
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default:
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Helpers::panic("[PICA] Attempted to get size of invalid texture type");
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}
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}
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// u and v are the UVs of the relevant texel
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// Texture data is stored interleaved in Morton order, ie in a Z - order curve as shown here
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// https://en.wikipedia.org/wiki/Z-order_curve
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// Textures are split into 8x8 tiles.This function returns the in - tile offset depending on the u & v of the texel
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// The in - tile offset is the sum of 2 offsets, one depending on the value of u % 8 and the other on the value of y % 8
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// As documented in this picture https ://en.wikipedia.org/wiki/File:Moser%E2%80%93de_Bruijn_addition.svg
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u32 Texture::mortonInterleave(u32 u, u32 v) {
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static constexpr u32 xOffsets[] = { 0, 1, 4, 5, 16, 17, 20, 21 };
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static constexpr u32 yOffsets[] = { 0, 2, 8, 10, 32, 34, 40, 42 };
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return xOffsets[u & 7] + yOffsets[v & 7];
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}
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// Get the byte offset of texel (u, v) in the texture
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u32 Texture::getSwizzledOffset(u32 u, u32 v, u32 width, u32 bytesPerPixel) {
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u32 offset = ((u & ~7) * 8) + ((v & ~7) * width); // Offset of the 8x8 tile the texel belongs to
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offset += mortonInterleave(u, v); // Add the in-tile offset of the texel
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return offset * bytesPerPixel;
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}
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// Same as the above code except we need to divide by 2 because 4 bits is smaller than a byte
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u32 Texture::getSwizzledOffset_4bpp(u32 u, u32 v, u32 width) {
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u32 offset = ((u & ~7) * 8) + ((v & ~7) * width); // Offset of the 8x8 tile the texel belongs to
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offset += mortonInterleave(u, v); // Add the in-tile offset of the texel
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return offset / 2;
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}
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// Get the texel at position (u, v)
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// fmt: format of the texture
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// data: texture data of the texture
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u32 Texture::decodeTexel(u32 u, u32 v, PICA::TextureFmt fmt, std::span<const u8> data) {
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switch (fmt) {
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case PICA::TextureFmt::RGBA4: {
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u32 offset = getSwizzledOffset(u, v, size.u(), 2);
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u16 texel = u16(data[offset]) | (u16(data[offset + 1]) << 8);
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u8 alpha = Colour::convert4To8Bit(getBits<0, 4, u8>(texel));
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u8 b = Colour::convert4To8Bit(getBits<4, 4, u8>(texel));
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u8 g = Colour::convert4To8Bit(getBits<8, 4, u8>(texel));
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u8 r = Colour::convert4To8Bit(getBits<12, 4, u8>(texel));
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return (alpha << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::RGBA5551: {
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const u32 offset = getSwizzledOffset(u, v, size.u(), 2);
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const u16 texel = u16(data[offset]) | (u16(data[offset + 1]) << 8);
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u8 alpha = getBit<0>(texel) ? 0xff : 0;
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u8 b = Colour::convert5To8Bit(getBits<1, 5, u8>(texel));
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u8 g = Colour::convert5To8Bit(getBits<6, 5, u8>(texel));
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u8 r = Colour::convert5To8Bit(getBits<11, 5, u8>(texel));
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return (alpha << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::RGB565: {
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const u32 offset = getSwizzledOffset(u, v, size.u(), 2);
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const u16 texel = u16(data[offset]) | (u16(data[offset + 1]) << 8);
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const u8 b = Colour::convert5To8Bit(getBits<0, 5, u8>(texel));
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const u8 g = Colour::convert6To8Bit(getBits<5, 6, u8>(texel));
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const u8 r = Colour::convert5To8Bit(getBits<11, 5, u8>(texel));
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return (0xff << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::RG8: {
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u32 offset = getSwizzledOffset(u, v, size.u(), 2);
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constexpr u8 b = 0;
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const u8 g = data[offset];
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const u8 r = data[offset + 1];
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return (0xff << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::RGB8: {
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const u32 offset = getSwizzledOffset(u, v, size.u(), 3);
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const u8 b = data[offset];
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const u8 g = data[offset + 1];
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const u8 r = data[offset + 2];
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return (0xff << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::RGBA8: {
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const u32 offset = getSwizzledOffset(u, v, size.u(), 4);
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const u8 alpha = data[offset];
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const u8 b = data[offset + 1];
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const u8 g = data[offset + 2];
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const u8 r = data[offset + 3];
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return (alpha << 24) | (b << 16) | (g << 8) | r;
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}
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case PICA::TextureFmt::IA4: {
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const u32 offset = getSwizzledOffset(u, v, size.u(), 1);
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const u8 texel = data[offset];
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const u8 alpha = Colour::convert4To8Bit(texel & 0xf);
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const u8 intensity = Colour::convert4To8Bit(texel >> 4);
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// Intensity formats just copy the intensity value to every colour channel
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return (alpha << 24) | (intensity << 16) | (intensity << 8) | intensity;
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}
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case PICA::TextureFmt::A4: {
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const u32 offset = getSwizzledOffset_4bpp(u, v, size.u());
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// For odd U coordinates, grab the top 4 bits, and the low 4 bits for even coordinates
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u8 alpha = data[offset] >> ((u % 2) ? 4 : 0);
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alpha = Colour::convert4To8Bit(getBits<0, 4>(alpha));
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// A8 sets RGB to 0
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return (alpha << 24) | (0 << 16) | (0 << 8) | 0;
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}
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case PICA::TextureFmt::A8: {
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u32 offset = getSwizzledOffset(u, v, size.u(), 1);
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const u8 alpha = data[offset];
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// A8 sets RGB to 0
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return (alpha << 24) | (0 << 16) | (0 << 8) | 0;
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}
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case PICA::TextureFmt::I4: {
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u32 offset = getSwizzledOffset_4bpp(u, v, size.u());
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// For odd U coordinates, grab the top 4 bits, and the low 4 bits for even coordinates
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u8 intensity = data[offset] >> ((u % 2) ? 4 : 0);
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intensity = Colour::convert4To8Bit(getBits<0, 4>(intensity));
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// Intensity formats just copy the intensity value to every colour channel
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return (0xff << 24) | (intensity << 16) | (intensity << 8) | intensity;
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}
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case PICA::TextureFmt::I8: {
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u32 offset = getSwizzledOffset(u, v, size.u(), 1);
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const u8 intensity = data[offset];
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// Intensity formats just copy the intensity value to every colour channel
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return (0xff << 24) | (intensity << 16) | (intensity << 8) | intensity;
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}
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case PICA::TextureFmt::IA8: {
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u32 offset = getSwizzledOffset(u, v, size.u(), 2);
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// Same as I8 except each pixel gets its own alpha value too
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const u8 alpha = data[offset];
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const u8 intensity = data[offset + 1];
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return (alpha << 24) | (intensity << 16) | (intensity << 8) | intensity;
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}
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case PICA::TextureFmt::ETC1: return getTexelETC(false, u, v, size.u(), data);
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case PICA::TextureFmt::ETC1A4: return getTexelETC(true, u, v, size.u(), data);
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default:
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Helpers::panic("[Texture::DecodeTexel] Unimplemented format = %d", static_cast<int>(fmt));
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}
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}
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void Texture::decodeTexture(std::span<const u8> data) {
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std::vector<u32> decoded;
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decoded.reserve(u64(size.u()) * u64(size.v()));
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// Decode texels line by line
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for (u32 v = 0; v < size.v(); v++) {
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for (u32 u = 0; u < size.u(); u++) {
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u32 colour = decodeTexel(u, v, format, data);
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decoded.push_back(colour);
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}
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}
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texture.bind();
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, size.u(), size.v(), GL_RGBA, GL_UNSIGNED_BYTE, decoded.data());
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}
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