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/****************************************************************************
*
* The MIT License (MIT)
*
* Copyright 2012 - 2020 Vivante Corporation, Santa Clara, California.
* All Rights Reserved.
*
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL VIVANTE AND/OR ITS SUPPLIERS 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.
*
*****************************************************************************/
#include <math.h>
#include <string.h>
#include "vg_lite.h"
void vg_lite_identity(vg_lite_matrix_t * matrix)
{
/* Set identify matrix. */
matrix->m[0][0] = 1.0f;
matrix->m[0][1] = 0.0f;
matrix->m[0][2] = 0.0f;
matrix->m[1][0] = 0.0f;
matrix->m[1][1] = 1.0f;
matrix->m[1][2] = 0.0f;
matrix->m[2][0] = 0.0f;
matrix->m[2][1] = 0.0f;
matrix->m[2][2] = 1.0f;
}
static void multiply(vg_lite_matrix_t * matrix, vg_lite_matrix_t * mult)
{
vg_lite_matrix_t temp;
int row, column;
/* Process all rows. */
for (row = 0; row < 3; row++) {
/* Process all columns. */
for (column = 0; column < 3; column++) {
/* Compute matrix entry. */
temp.m[row][column] = (matrix->m[row][0] * mult->m[0][column])
+ (matrix->m[row][1] * mult->m[1][column])
+ (matrix->m[row][2] * mult->m[2][column]);
}
}
/* Copy temporary matrix into result. */
memcpy(matrix, &temp, sizeof(temp));
}
void vg_lite_translate(vg_lite_float_t x, vg_lite_float_t y, vg_lite_matrix_t * matrix)
{
/* Set translation matrix. */
vg_lite_matrix_t t = { { {1.0f, 0.0f, x},
{0.0f, 1.0f, y},
{0.0f, 0.0f, 1.0f}
} };
/* Multiply with current matrix. */
multiply(matrix, &t);
}
void vg_lite_scale(vg_lite_float_t scale_x, vg_lite_float_t scale_y, vg_lite_matrix_t * matrix)
{
/* Set scale matrix. */
vg_lite_matrix_t s = { { {scale_x, 0.0f, 0.0f},
{0.0f, scale_y, 0.0f},
{0.0f, 0.0f, 1.0f}
} };
/* Multiply with current matrix. */
multiply(matrix, &s);
}
void vg_lite_rotate(vg_lite_float_t degrees, vg_lite_matrix_t * matrix)
{
#ifndef M_PI
#define M_PI 3.1415926f
#endif
/* Convert degrees into radians. */
vg_lite_float_t angle = degrees / 180.0f * M_PI;
/* Compuet cosine and sine values. */
vg_lite_float_t cos_angle = cosf(angle);
vg_lite_float_t sin_angle = sinf(angle);
/* Set rotation matrix. */
vg_lite_matrix_t r = { { {cos_angle, -sin_angle, 0.0f},
{sin_angle, cos_angle, 0.0f},
{0.0f, 0.0f, 1.0f}
} };
/* Multiply with current matrix. */
multiply(matrix, &r);
}
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