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Diffstat (limited to 'kmscube/esTransform.cpp')
| -rw-r--r-- | kmscube/esTransform.cpp | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/kmscube/esTransform.cpp b/kmscube/esTransform.cpp new file mode 100644 index 0000000..899c038 --- /dev/null +++ b/kmscube/esTransform.cpp @@ -0,0 +1,235 @@ +// +// 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; +} + |