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/*
* Copyright © 2008 Ben Smith
* Copyright © 2010-2011 Linaro Limited
*
* This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
*
* glmark2 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.
*
* glmark2 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
* glmark2. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Ben Smith (original glmark benchmark)
* Alexandros Frantzis (glmark2)
* Jesse Barker
*/
#ifndef GLMARK2_CANVAS_H_
#define GLMARK2_CANVAS_H_
#include "gl-headers.h"
#include "mat.h"
#include "gl-visual-config.h"
#include <stdint.h>
#include <string>
#include <stdio.h>
#include <cmath>
/**
* Abstraction for a GL rendering target.
*/
class Canvas
{
public:
virtual ~Canvas() {}
/**
* A pixel value.
*/
struct Pixel {
Pixel():
r(0), g(0), b(0), a(0) {}
Pixel(uint8_t r, uint8_t g, uint8_t b, uint8_t a):
r(r), g(g), b(b), a(a) {}
/**
* Gets the pixel value as a 32-bit integer in 0xAABBGGRR format.
*
* @return the pixel value
*/
uint32_t to_le32()
{
return static_cast<uint32_t>(r) +
(static_cast<uint32_t>(g) << 8) +
(static_cast<uint32_t>(b) << 16) +
(static_cast<uint32_t>(a) << 24);
}
/**
* Gets the euclidian distance from this pixel in 3D RGB space.
*
* @param p the pixel to get the distance from
*
* @return the euclidian distance
*/
double distance_rgb(const Canvas::Pixel &p)
{
// These work without casts because of integer promotion rules
// (the uint8_ts are promoted to ints)
double d = (r - p.r) * (r - p.r) +
(g - p.g) * (g - p.g) +
(b - p.b) * (b - p.b);
return std::sqrt(d);
}
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t a;
};
/**
* Initializes the canvas and makes it the target of GL operations.
*
* This method should be implemented in derived classes.
*
* @return whether initialization succeeded
*/
virtual bool init() { return false; }
/**
* Resets the canvas, destroying and recreating resources to give each new
* test scenario a fresh context for rendering.
*
* This method should be implemented in derived classes.
*
* @return whether reset succeeded
*/
virtual bool reset() { return false; }
/**
* Changes the visibility of the canvas.
*
* The canvas is initially not visible.
*
* This method should be implemented in derived classes.
*
* @param visible true to make the Canvas visible, false otherwise
*/
virtual void visible(bool visible) { static_cast<void>(visible); }
/**
* Clears the canvas.
* This method should be implemented in derived classes.
*/
virtual void clear() {}
/**
* Ensures that the canvas on-screen representation gets updated
* with the latest canvas contents.
*
* This method should be implemented in derived classes.
*/
virtual void update() {}
/**
* Prints information about the canvas.
*
* This method should be implemented in derived classes.
*/
virtual void print_info() {}
/**
* Reads a pixel from the canvas.
*
* The (0, 0) point is the lower left corner. The X and Y coordinates
* increase towards the right and top, respectively.
*
* This method should be implemented in derived classes.
*
* @param x the X coordinate
* @param y the Y coordinate
*
* @return the pixel
*/
virtual Pixel read_pixel(int x, int y)
{
static_cast<void>(x);
static_cast<void>(y);
return Pixel();
}
/**
* Writes the canvas contents to a file.
*
* The pixel save order is upper left to lower right. Each pixel value
* is stored as four consecutive bytes R,G,B,A.
*
* This method should be implemented in derived classes.
*
* @param filename the name of the file to write to
*/
virtual void write_to_file(std::string &filename) { static_cast<void>(filename); }
/**
* Whether we should quit the application.
*
* This method should be implemented in derived classes.
*
* @return true if we should quit, false otherwise
*/
virtual bool should_quit() { return false; }
/**
* Resizes the canvas.
*
* This method should be implemented in derived classes.
*
* @param width the new width in pixels
* @param height the new height in pixels
*
* @return true if we should quit, false otherwise
*/
virtual void resize(int width, int height) { static_cast<void>(width); static_cast<void>(height); }
/**
* Gets the FBO associated with the canvas.
*
* @return the FBO
*/
virtual unsigned int fbo() { return 0; }
/**
* Gets a dummy canvas object.
*
* @return the dummy canvas
*/
static Canvas &dummy()
{
static Canvas dummy_canvas(0, 0);
return dummy_canvas;
}
/**
* Gets the width of the canvas.
*
* @return the width in pixels
*/
int width() { return width_; }
/**
* Gets the height of the canvas.
*
* @return the height in pixels
*/
int height() { return height_; }
/**
* Gets the projection matrix recommended for use with the canvas.
*
* It's not mandatory to use this projection matrix.
*
* @return the projection matrix
*/
const LibMatrix::mat4 &projection() { return projection_; }
/**
* Sets whether the canvas should be backed by an off-screen surface.
*
* This takes effect after the next init()/reset().
*/
void offscreen(bool offscreen) { offscreen_ = offscreen; }
/**
* Sets the preferred visual configuration.
*
* This takes effect after the next init()/reset().
*/
void visual_config(GLVisualConfig &config) { visual_config_ = config; }
protected:
Canvas(int width, int height) :
width_(width), height_(height), offscreen_(false) {}
int width_;
int height_;
LibMatrix::mat4 projection_;
bool offscreen_;
GLVisualConfig visual_config_;
};
#endif
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