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update psuedo_vram header

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Justin Scofield
2022-07-11 21:47:39 -04:00
parent 56c81ae97e
commit 644e72b086
1 changed files with 12 additions and 25 deletions
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37
src/app/gfx/psuedo_vram.h
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@@ -5,42 +5,29 @@
#include <cstdint> #include <cstdint>
#include <unordered_map> #include <unordered_map>
#include <vector>
#include "app/gfx/bitmap.h" #include "app/gfx/bitmap.h"
#include "app/gfx/snes_palette.h"
#include "app/gfx/snes_tile.h"
namespace yaze { namespace yaze {
namespace app { namespace app {
namespace gfx { namespace gfx {
// Picture Processor Unit: 15-Bit // VRAM: 64 KB of VRAM for screen maps and tile sets (backgrounds and objects)
// OAM: 512 + 32 bytes for objects (Object Attribute Memory)
// Video RAM: 64 KB of VRAM for screen maps (for 'background' layers) and tile // CGRAM: 512 bytes for palette data
// sets (for backgrounds and objects); 512 + 32 bytes of 'OAM' (Object Attribute
// Memory) for objects; 512 bytes of 'CGRAM' for palette data.
// Palette: 256 entries; 15-Bit color (BGR555) for a total of 32,768 colors. // Palette: 256 entries; 15-Bit color (BGR555) for a total of 32,768 colors.
// Maximum colors per layer per scanline: 256. Maximum colors on-screen: 32,768 // Resolution: between 256x224 and 512x448.
// (using color arithmetic for transparency effects).
// Resolution: between 256x224 and 512x448. Most games used 256x224 pixels since
// higher resolutions caused slowdown, flicker, and/or had increased limitations
// on layers and colors (due to memory bandwidth constraints); the higher
// resolutions were used for less processor-intensive games, in-game menus,
// text, and high resolution images.
// Maximum onscreen objects (sprites): 128 (32 per line, up to 34 8x8 tiles per
// line).
// Maximum number of sprite pixels on one scanline: 256. The renderer was
// designed such that it would drop the frontmost sprites instead of the
// rearmost sprites if a scanline exceeded the limit, allowing for creative
// clipping effects.
// Most common display modes: Pixel-to-pixel text mode 1 (16 colors per tile; 3
// scrolling layers) and affine mapped text mode 7 (256 colors per tile; one
// rotating/scaling layer).
class psuedo_vram { class psuedo_vram {
public: public:
void ChangeGraphicsSet(const std::vector<Bitmap>& graphics_set);
void ChangeGraphicsPalette(const SNESPalette& graphics_pal);
void ChangeSpriteSet(const std::vector<Bitmap>& sprite_set);
void ChangeSpritePalette(const SNSPalette& sprite_pal);
private: private:
std::unordered_map<uint32_t, Bitmap> m_vram; std::unordered_map<uint32_t, Bitmap> m_vram;
static const uint32_t REAL_VRAM_SIZE = 0x8000; static const uint32_t REAL_VRAM_SIZE = 0x8000;