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//
// Book: OpenGL(R) ES 2.0 Programming Guide
// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
// ISBN-10: 0321502795
// ISBN-13: 9780321502797
// Publisher: Addison-Wesley Professional
// URLs: http://safari.informit.com/9780321563835
// http://www.opengles-book.com
//
/*
* (c) 2009 Aaftab Munshi, Dan Ginsburg, Dave Shreiner
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
//
/// \file ESUtil.h
/// \brief A utility library for OpenGL ES. This library provides a
/// basic common framework for the example applications in the
/// OpenGL ES 2.0 Programming Guide.
//
#ifndef ESUTIL_H
#define ESUTIL_H
///
// Includes
//
#include <GLES2/gl2.h>
#include <EGL/egl.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct
{
GLfloat m[4][4];
} ESMatrix;
//
/// \brief multiply matrix specified by result with a scaling matrix and return new matrix in result
/// \param result Specifies the input matrix. Scaled matrix is returned in result.
/// \param sx, sy, sz Scale factors along the x, y and z axes respectively
//
void esScale(ESMatrix* result, GLfloat sx, GLfloat sy, GLfloat sz);
//
/// \brief multiply matrix specified by result with a translation matrix and return new matrix in result
/// \param result Specifies the input matrix. Translated matrix is returned in result.
/// \param tx, ty, tz Scale factors along the x, y and z axes respectively
//
void esTranslate(ESMatrix* result, GLfloat tx, GLfloat ty, GLfloat tz);
//
/// \brief multiply matrix specified by result with a rotation matrix and return new matrix in result
/// \param result Specifies the input matrix. Rotated matrix is returned in result.
/// \param angle Specifies the angle of rotation, in degrees.
/// \param x, y, z Specify the x, y and z coordinates of a vector, respectively
//
void esRotate(ESMatrix* result, GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
//
// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
/// \param result Specifies the input matrix. new matrix is returned in result.
/// \param left, right Coordinates for the left and right vertical clipping planes
/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes
/// \param nearZ, farZ Distances to the near and far depth clipping planes. Both distances must be positive.
//
void esFrustum(ESMatrix* result, float left, float right, float bottom, float top, float nearZ, float farZ);
//
/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
/// \param result Specifies the input matrix. new matrix is returned in result.
/// \param fovy Field of view y angle in degrees
/// \param aspect Aspect ratio of screen
/// \param nearZ Near plane distance
/// \param farZ Far plane distance
//
void esPerspective(ESMatrix* result, float fovy, float aspect, float nearZ, float farZ);
//
/// \brief multiply matrix specified by result with a perspective matrix and return new matrix in result
/// \param result Specifies the input matrix. new matrix is returned in result.
/// \param left, right Coordinates for the left and right vertical clipping planes
/// \param bottom, top Coordinates for the bottom and top horizontal clipping planes
/// \param nearZ, farZ Distances to the near and far depth clipping planes. These values are negative if plane is behind the viewer
//
void esOrtho(ESMatrix* result, float left, float right, float bottom, float top, float nearZ, float farZ);
//
/// \brief perform the following operation - result matrix = srcA matrix * srcB matrix
/// \param result Returns multiplied matrix
/// \param srcA, srcB Input matrices to be multiplied
//
void esMatrixMultiply(ESMatrix* result, ESMatrix* srcA, ESMatrix* srcB);
//
//// \brief return an indentity matrix
//// \param result returns identity matrix
//
void esMatrixLoadIdentity(ESMatrix* result);
#ifdef __cplusplus
}
#endif
#endif // ESUTIL_H
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