[nostalgia/core/userland] Fix Tile row skipping and move some non-SDL code into userland

src/nostalgia/core/userland/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_library(
 	NostalgiaCore-Userspace OBJECT
+		gfx.cpp
 		gfx_opengl.cpp
 		glutils.cpp
 		media.cpp

src/nostalgia/core/userland/gfx.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <ox/claw/claw.hpp>
+#include <nostalgia/core/gfx.hpp>
+#include <nostalgia/core/gfx.hpp>
+
+#include "gfx.hpp"
+
+namespace nostalgia::core {
+
+static ox::Result<ox::Vector<char>> readFile(Context *ctx, const ox::FileAddress &file) {
+	oxRequire(stat, ctx->rom->stat(file));
+	ox::Vector<char> buff(stat.size);
+	oxReturnError(ctx->rom->read(file, buff.data(), buff.size()));
+	return buff;
+}
+
+template<typename T>
+ox::Result<T> readObj(Context *ctx, const ox::FileAddress &file) {
+	oxRequire(buff, readFile(ctx, file));
+	T t;
+	oxReturnError(ox::readClaw(buff.data(), buff.size(), &t));
+	return t;
+}
+
+ox::Error initConsole(Context *ctx) {
+	constexpr auto TilesheetAddr = "/TileSheets/Charset.ng";
+	return loadBgTileSheet(ctx, 0, TilesheetAddr);
+}
+
+ox::Error loadSpriteTileSheet(Context*,
+                              int,
+                              ox::FileAddress,
+                              ox::FileAddress) {
+	return OxError(0);
+}
+
+ox::Error loadBgTileSheet(Context *ctx,
+                          int section,
+                          ox::FileAddress tilesheetPath,
+                          ox::FileAddress palettePath) {
+	oxRequire(tilesheet, readObj<NostalgiaGraphic>(ctx, tilesheetPath));
+	if (!palettePath) {
+		palettePath = tilesheet.defaultPalette;
+	}
+	oxRequire(palette, readObj<NostalgiaPalette>(ctx, palettePath));
+	const unsigned bytesPerTile = tilesheet.bpp == 8 ? 64 : 32;
+	const auto tiles = tilesheet.pixels.size() / bytesPerTile;
+	constexpr int width = 8;
+	const int height = 8 * tiles;
+	ox::Vector<uint32_t> pixels;
+	if (bytesPerTile == 64) { // 8 BPP
+		pixels.resize(tilesheet.pixels.size());
+		for (std::size_t i = 0; i < tilesheet.pixels.size(); ++i) {
+			pixels[i] = toColor32(palette.colors[tilesheet.pixels[i]]);
+		}
+	} else { // 4 BPP
+		pixels.resize(tilesheet.pixels.size() * 2);
+		for (std::size_t i = 0; i < tilesheet.pixels.size(); ++i) {
+			pixels[i * 2 + 0] = toColor32(palette.colors[tilesheet.pixels[i] & 0xF]);
+			pixels[i * 2 + 1] = toColor32(palette.colors[tilesheet.pixels[i] >> 4]);
+		}
+	}
+	return renderer::loadBgTexture(ctx, section, pixels.data(), width, height);
+}
+
+}

src/nostalgia/core/userland/gfx_opengl.cpp

@@ -22,15 +22,16 @@ using TileMap = std::array<std::array<int, 128>, 128>;
 
 namespace renderer {
 
-constexpr auto TileRows = 16;
-constexpr auto TileColumns = 16;
+constexpr auto TileRows = 128;
+constexpr auto TileColumns = 128;
 constexpr auto TileCount = TileRows * TileColumns;
+constexpr auto BgVertexVboRows = 4;
 constexpr auto BgVertexVboLength = 16;
 constexpr auto BgVertexEboLength = 6;
 
 struct BackgroundBufferset: public Bufferset {
-	std::array<float, TileCount * BgVertexVboLength * 4> bgVertices;
-	std::array<GLuint, TileCount * BgVertexEboLength * 4> bgEbos;
+	std::array<float, TileCount * BgVertexVboLength> bgVertices;
+	std::array<GLuint, TileCount * BgVertexEboLength> bgEbos;
 };
 
 struct GlImplData {
@@ -64,16 +65,17 @@ constexpr const GLchar *bgfshad = R"(
 void initTileBufferObjects(unsigned vi, float x, float y, float *vbo, GLuint *ebo) {
 	// don't worry, this gets optimized to something much more ideal
 	constexpr float xmod = 0.06f;
+	constexpr float ymod = 0.1f;
 	x *= xmod;
-	y *= 0.1f;
-	const float vertices[BgVertexVboLength] = {
+	y *= ymod;
+	const float vertices[] = {
 		       x,        y, 0, 0.04, // bottom left
 		x + xmod,        y, 1, 0.04, // bottom right
-		x + xmod, y + 0.1f, 1,    0, // top right
-		       x, y + 0.1f, 0,    0, // top left
+		x + xmod, y + ymod, 1, 0.02, // top right
+		       x, y + ymod, 0, 0.02, // top left
 	};
 	memcpy(vbo, vertices, sizeof(vertices));
-	const GLuint elms[BgVertexEboLength] = {
+	const GLuint elms[] = {
 		vi + 0, vi + 1, vi + 2,
 		vi + 2, vi + 3, vi + 0,
 	};
@@ -84,10 +86,9 @@ void initBackgroundBufferObjects(GLuint shader, BackgroundBufferset *bs) {
 	auto i = 0u;
 	for (auto x = 0u; x < TileColumns; ++x) {
 		for (auto y = 0u; y < TileRows; ++y) {
-			const auto vi = i * BgVertexVboLength;
-			auto vbo = &bs->bgVertices[vi];
+			auto vbo = &bs->bgVertices[i * BgVertexVboLength];
 			auto ebo = &bs->bgEbos[i * BgVertexEboLength];
-			initTileBufferObjects(vi, x, y, vbo, ebo);
+			initTileBufferObjects(i * BgVertexVboRows, x, y, vbo, ebo);
 			++i;
 		}
 	}