/**
** Supermodel
** A Sega Model 3 Arcade Emulator.
** Copyright 2011-2012 Bart Trzynadlowski, Nik Henson
**
** This file is part of Supermodel.
**
** Supermodel is free software: you can redistribute it and/or modify it under
** the terms of the GNU General Public License as published by the Free
** Software Foundation, either version 3 of the License, or (at your option)
** any later version.
**
** Supermodel is distributed in the hope that it will be useful, but WITHOUT
** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
** more details.
**
** You should have received a copy of the GNU General Public License along
** with Supermodel. If not, see .
**/
/*
* Render2D.h
*
* Header file defining the CRender2D class: OpenGL tile generator graphics.
*/
#ifndef INCLUDED_RENDER2D_H
#define INCLUDED_RENDER2D_H
#include "Pkgs/glew.h"
#include "Util/NewConfig.h"
/*
* CRender2D:
*
* Tile generator graphics engine. This must be constructed and initialized
* before being attached to any objects that want to make use of it. Apart from
* the constructor, all members assume that a global GL device
* context is available and that GL functions may be called.
*/
class CRender2D
{
public:
/*
* BeginFrame(void):
*
* Prepare to render a new frame. Must be called once per frame prior to
* drawing anything.
*/
void BeginFrame(void);
/*
* PreRenderFrame(void):
*
* Draws the all top layers (above 3D graphics) and bottom layers (below 3D
* graphics) but does not yet display them. May send data to the GPU.
*/
void PreRenderFrame(void);
/*
* RenderFrameBottom(void):
*
* Overwrites the color buffer with bottom surface that was pre-rendered by
* the last call to PreRenderFrame().
*/
void RenderFrameBottom(void);
/*
* RenderFrameTop(void):
*
* Draws the top surface (if it exists) that was pre-rendered by the last
* call to PreRenderFrame(). Previously drawn graphics layers will be visible
* through transparent regions.
*/
void RenderFrameTop(void);
/*
* EndFrame(void):
*
* Signals the end of rendering for this frame. Must be called last during
* the frame.
*/
void EndFrame(void);
/*
* WriteVRAM(addr, data):
*
* Indicates what will be written next to the tile generator's RAM. The
* VRAM address must not have yet been updated, to allow the renderer to
* check for changes. Data is accepted in the same form as the tile
* generator: the MSB is what was written to addr+3. This function is
* intended to facilitate on-the-fly decoding of tiles and palette data.
*
* Parameters:
* addr Address in tile generator RAM. Caller must ensure it is
* clamped to the range 0x000000 to 0x11FFFF because this
* function does not.
* data The data to write.
*/
void WriteVRAM(unsigned addr, uint32_t data);
/*
* AttachRegisters(regPtr):
*
* Attaches tile generator registers. This must be done prior to any
* rendering otherwise the program may crash with an access violation.
*
* Parameters:
* regPtr Pointer to the base of the tile generator registers. There
* are assumed to be 64 in all.
*/
void AttachRegisters(const uint32_t *regPtr);
/*
* AttachPalette(palPtr):
*
* Attaches tile generator palettes. This must be done prior to any
* rendering.
*
* Parameters:
* palPtr Pointer to two palettes. The first is for layers A/A' and
* the second is for B/B'.
*/
void AttachPalette(const uint32_t *palPtr[2]);
/*
* AttachVRAM(vramPtr):
*
* Attaches tile generator RAM. This must be done prior to any rendering
* otherwise the program may crash with an access violation.
*
* Parameters:
* vramPtr Pointer to the base of the tile generator RAM (0x120000
* bytes). VRAM is assumed to be in little endian format.
*/
void AttachVRAM(const uint8_t *vramPtr);
/*
* Init(xOffset, yOffset, xRes, yRes, totalXRes, totalYRes);
*
* One-time initialization of the context. Must be called before any other
* members (meaning it should be called even before being attached to any
* other objects that want to use it).
*
* Parameters:
* xOffset X offset of the viewable area within OpenGL display
* surface, in pixels.
* yOffset Y offset.
* xRes Horizontal resolution of the viewable area.
* yRes Vertical resolution.
* totalXRes Horizontal resolution of the complete display area.
* totalYRes Vertical resolution.
*
* Returns:
* OKAY is successful, otherwise FAILED if a non-recoverable error
* occurred. Prints own error messages.
*/
bool Init(unsigned xOffset, unsigned yOffset, unsigned xRes, unsigned yRes, unsigned totalXRes, unsigned totalYRes);
/*
* CRender2D(config):
* ~CRender2D(void):
*
* Constructor and destructor.
*
* Parameters:
* config Run-time configuration.
*/
CRender2D(const Util::Config::Node &config);
~CRender2D(void);
private:
// Private member functions
std::pair DrawTilemaps(uint32_t *destBottom, uint32_t *destTop);
void DisplaySurface(int surface);
void Setup2D(bool isBottom);
// Run-time configuration
const Util::Config::Node &m_config;
// Data received from tile generator device object
const uint32_t *m_vram;
const uint32_t *m_palette[2]; // palettes for A/A' and B/B'
const uint32_t *m_regs;
// OpenGL data
GLuint m_texID[2]; // IDs for the 2 layer textures (top and bottom)
unsigned m_xPixels = 496; // display surface resolution
unsigned m_yPixels = 384; // ...
unsigned m_xOffset = 0; // offset
unsigned m_yOffset = 0;
unsigned m_totalXPixels; // total display surface resolution
unsigned m_totalYPixels;
unsigned m_correction = 0;
// Shader programs and input data locations
GLuint m_shaderProgram; // shader program object
GLuint m_vertexShader; // vertex shader handle
GLuint m_fragmentShader; // fragment shader
GLuint m_textureMapLoc; // location of "textureMap" uniform
// PreRenderFrame() tracks which surfaces exist in current frame
std::pair m_surfaces_present = std::pair(false, false);
// Buffers
uint8_t *m_memoryPool = 0; // all memory is allocated here
uint32_t *m_topSurface = 0; // 512x384x32bpp pixel surface for top layers
uint32_t *m_bottomSurface = 0; // bottom layers
};
#endif // INCLUDED_RENDER2D_H