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First stab at scan line rendering.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2017-10-03 23:54:39 +01:00
parent 27acba97ff
commit c92b0642a1
2 changed files with 20 additions and 20 deletions
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1
LR35902/inc/Display.h
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@ -37,6 +37,7 @@ namespace EightBit {
Bus& m_bus;
const AbstractColourPalette* m_colours;
std::array<ObjectAttribute, 40> m_objectAttributes;
uint8_t m_currentScanLine;
std::array<int, 4> createPalette(int address);

39
LR35902/src/Display.cpp
View File

@ -8,7 +8,8 @@
EightBit::GameBoy::Display::Display(const AbstractColourPalette* colours, Bus& bus)
: m_bus(bus),
m_colours(colours) {
m_colours(colours),
m_currentScanLine(0) {
}
const std::vector<uint32_t>& EightBit::GameBoy::Display::pixels() const {
@ -24,6 +25,7 @@ void EightBit::GameBoy::Display::render() {
auto control = m_bus.peekRegister(Bus::LCDC);
if (control & Bus::LcdEnable) {
m_currentScanLine = m_bus.peekRegister(Bus::LY);
if (control & Bus::DisplayBackground)
renderBackground();
@ -122,28 +124,20 @@ void EightBit::GameBoy::Display::renderBackground(
int offsetX, int offsetY,
const std::array<int, 4>& palette) {
std::map<int, CharacterDefinition> definitions;
const int row = (m_currentScanLine - offsetY) / 8;
for (int row = 0; row < BufferCharacterHeight; ++row) {
for (int column = 0; column < BufferCharacterWidth; ++column) {
for (int column = 0; column < BufferCharacterWidth; ++column) {
const auto address = bgArea + row * BufferCharacterWidth + column;
const auto character = m_bus.peek(address);
const auto address = bgArea + row * BufferCharacterWidth + column;
const auto character = m_bus.peek(address);
auto definitionPair = definitions.find(character);
if (definitionPair == definitions.end()) {
definitions[character] = CharacterDefinition(&m_bus, bgCharacters + 16 * character, 8);
definitionPair = definitions.find(character);
}
const auto definition = definitionPair->second;
renderTile(
8,
column * 8 + offsetX, row * 8 + offsetY,
false, false, false,
palette,
definition);
}
const auto definition = CharacterDefinition(&m_bus, bgCharacters + 16 * character, 8);
renderTile(
8,
column * 8 + offsetX, row * 8 + offsetY,
false, false, false,
palette,
definition);
}
}
@ -165,6 +159,9 @@ void EightBit::GameBoy::Display::renderTile(
if (y >= RasterHeight)
continue;
if (y != m_currentScanLine)
continue;
const auto rowDefinition = definition.get(cy);
for (int cx = 0; cx < width; ++cx) {
@ -179,5 +176,7 @@ void EightBit::GameBoy::Display::renderTile(
m_pixels[outputPixel] = m_colours->getColour(palette[colour]);
}
}
break;
}
}