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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.
- */
-
-// ESUtil.c
-//
-// 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.
-//
-
-///
-// Includes
-//
-#include "esTransform.h"
-#include <math.h>
-#include <string.h>
-
-#define PI 3.1415926535897932384626433832795f
-
-void
-esScale(ESMatrix *result, GLfloat sx, GLfloat sy, GLfloat sz)
-{
- result->m[0][0] *= sx;
- result->m[0][1] *= sx;
- result->m[0][2] *= sx;
- result->m[0][3] *= sx;
-
- result->m[1][0] *= sy;
- result->m[1][1] *= sy;
- result->m[1][2] *= sy;
- result->m[1][3] *= sy;
-
- result->m[2][0] *= sz;
- result->m[2][1] *= sz;
- result->m[2][2] *= sz;
- result->m[2][3] *= sz;
-}
-
-void
-esTranslate(ESMatrix *result, GLfloat tx, GLfloat ty, GLfloat tz)
-{
- result->m[3][0] += (result->m[0][0] * tx + result->m[1][0] * ty + result->m[2][0] * tz);
- result->m[3][1] += (result->m[0][1] * tx + result->m[1][1] * ty + result->m[2][1] * tz);
- result->m[3][2] += (result->m[0][2] * tx + result->m[1][2] * ty + result->m[2][2] * tz);
- result->m[3][3] += (result->m[0][3] * tx + result->m[1][3] * ty + result->m[2][3] * tz);
-}
-
-void
-esRotate(ESMatrix *result, GLfloat angle, GLfloat x, GLfloat y, GLfloat z)
-{
- GLfloat sinAngle, cosAngle;
- GLfloat mag = sqrtf(x * x + y * y + z * z);
-
- sinAngle = sinf ( angle * PI / 180.0f );
- cosAngle = cosf ( angle * PI / 180.0f );
- if ( mag > 0.0f )
- {
- GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs;
- GLfloat oneMinusCos;
- ESMatrix rotMat;
-
- x /= mag;
- y /= mag;
- z /= mag;
-
- xx = x * x;
- yy = y * y;
- zz = z * z;
- xy = x * y;
- yz = y * z;
- zx = z * x;
- xs = x * sinAngle;
- ys = y * sinAngle;
- zs = z * sinAngle;
- oneMinusCos = 1.0f - cosAngle;
-
- rotMat.m[0][0] = (oneMinusCos * xx) + cosAngle;
- rotMat.m[0][1] = (oneMinusCos * xy) - zs;
- rotMat.m[0][2] = (oneMinusCos * zx) + ys;
- rotMat.m[0][3] = 0.0F;
-
- rotMat.m[1][0] = (oneMinusCos * xy) + zs;
- rotMat.m[1][1] = (oneMinusCos * yy) + cosAngle;
- rotMat.m[1][2] = (oneMinusCos * yz) - xs;
- rotMat.m[1][3] = 0.0F;
-
- rotMat.m[2][0] = (oneMinusCos * zx) - ys;
- rotMat.m[2][1] = (oneMinusCos * yz) + xs;
- rotMat.m[2][2] = (oneMinusCos * zz) + cosAngle;
- rotMat.m[2][3] = 0.0F;
-
- rotMat.m[3][0] = 0.0F;
- rotMat.m[3][1] = 0.0F;
- rotMat.m[3][2] = 0.0F;
- rotMat.m[3][3] = 1.0F;
-
- esMatrixMultiply( result, &rotMat, result );
- }
-}
-
-void
-esFrustum(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ)
-{
- float deltaX = right - left;
- float deltaY = top - bottom;
- float deltaZ = farZ - nearZ;
- ESMatrix frust;
-
- if ( (nearZ <= 0.0f) || (farZ <= 0.0f) ||
- (deltaX <= 0.0f) || (deltaY <= 0.0f) || (deltaZ <= 0.0f) )
- return;
-
- frust.m[0][0] = 2.0f * nearZ / deltaX;
- frust.m[0][1] = frust.m[0][2] = frust.m[0][3] = 0.0f;
-
- frust.m[1][1] = 2.0f * nearZ / deltaY;
- frust.m[1][0] = frust.m[1][2] = frust.m[1][3] = 0.0f;
-
- frust.m[2][0] = (right + left) / deltaX;
- frust.m[2][1] = (top + bottom) / deltaY;
- frust.m[2][2] = -(nearZ + farZ) / deltaZ;
- frust.m[2][3] = -1.0f;
-
- frust.m[3][2] = -2.0f * nearZ * farZ / deltaZ;
- frust.m[3][0] = frust.m[3][1] = frust.m[3][3] = 0.0f;
-
- esMatrixMultiply(result, &frust, result);
-}
-
-
-void
-esPerspective(ESMatrix *result, float fovy, float aspect, float nearZ, float farZ)
-{
- GLfloat frustumW, frustumH;
-
- frustumH = tanf( fovy / 360.0f * PI ) * nearZ;
- frustumW = frustumH * aspect;
-
- esFrustum( result, -frustumW, frustumW, -frustumH, frustumH, nearZ, farZ );
-}
-
-void
-esOrtho(ESMatrix *result, float left, float right, float bottom, float top, float nearZ, float farZ)
-{
- float deltaX = right - left;
- float deltaY = top - bottom;
- float deltaZ = farZ - nearZ;
- ESMatrix ortho;
-
- if ( (deltaX == 0.0f) || (deltaY == 0.0f) || (deltaZ == 0.0f) )
- return;
-
- esMatrixLoadIdentity(&ortho);
- ortho.m[0][0] = 2.0f / deltaX;
- ortho.m[3][0] = -(right + left) / deltaX;
- ortho.m[1][1] = 2.0f / deltaY;
- ortho.m[3][1] = -(top + bottom) / deltaY;
- ortho.m[2][2] = -2.0f / deltaZ;
- ortho.m[3][2] = -(nearZ + farZ) / deltaZ;
-
- esMatrixMultiply(result, &ortho, result);
-}
-
-
-void
-esMatrixMultiply(ESMatrix *result, ESMatrix *srcA, ESMatrix *srcB)
-{
- ESMatrix tmp;
- int i;
-
- for (i=0; i<4; i++)
- {
- tmp.m[i][0] = (srcA->m[i][0] * srcB->m[0][0]) +
- (srcA->m[i][1] * srcB->m[1][0]) +
- (srcA->m[i][2] * srcB->m[2][0]) +
- (srcA->m[i][3] * srcB->m[3][0]) ;
-
- tmp.m[i][1] = (srcA->m[i][0] * srcB->m[0][1]) +
- (srcA->m[i][1] * srcB->m[1][1]) +
- (srcA->m[i][2] * srcB->m[2][1]) +
- (srcA->m[i][3] * srcB->m[3][1]) ;
-
- tmp.m[i][2] = (srcA->m[i][0] * srcB->m[0][2]) +
- (srcA->m[i][1] * srcB->m[1][2]) +
- (srcA->m[i][2] * srcB->m[2][2]) +
- (srcA->m[i][3] * srcB->m[3][2]) ;
-
- tmp.m[i][3] = (srcA->m[i][0] * srcB->m[0][3]) +
- (srcA->m[i][1] * srcB->m[1][3]) +
- (srcA->m[i][2] * srcB->m[2][3]) +
- (srcA->m[i][3] * srcB->m[3][3]) ;
- }
- memcpy(result, &tmp, sizeof(ESMatrix));
-}
-
-
-void
-esMatrixLoadIdentity(ESMatrix *result)
-{
- memset(result, 0x0, sizeof(ESMatrix));
- result->m[0][0] = 1.0f;
- result->m[1][1] = 1.0f;
- result->m[2][2] = 1.0f;
- result->m[3][3] = 1.0f;
-}
-
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