114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/****************************************************************************
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*
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* The MIT License (MIT)
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*
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* Copyright 2012 - 2020 Vivante Corporation, Santa Clara, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* 'Software'), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VIVANTE AND/OR ITS SUPPLIERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*****************************************************************************/
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#include <math.h>
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#include <string.h>
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#include "vg_lite.h"
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void vg_lite_identity(vg_lite_matrix_t * matrix)
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{
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/* Set identify matrix. */
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matrix->m[0][0] = 1.0f;
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matrix->m[0][1] = 0.0f;
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matrix->m[0][2] = 0.0f;
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matrix->m[1][0] = 0.0f;
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matrix->m[1][1] = 1.0f;
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matrix->m[1][2] = 0.0f;
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matrix->m[2][0] = 0.0f;
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matrix->m[2][1] = 0.0f;
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matrix->m[2][2] = 1.0f;
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}
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static void multiply(vg_lite_matrix_t * matrix, vg_lite_matrix_t * mult)
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{
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vg_lite_matrix_t temp;
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int row, column;
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/* Process all rows. */
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for (row = 0; row < 3; row++) {
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/* Process all columns. */
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for (column = 0; column < 3; column++) {
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/* Compute matrix entry. */
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temp.m[row][column] = (matrix->m[row][0] * mult->m[0][column])
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+ (matrix->m[row][1] * mult->m[1][column])
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+ (matrix->m[row][2] * mult->m[2][column]);
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}
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}
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/* Copy temporary matrix into result. */
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memcpy(matrix, &temp, sizeof(temp));
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}
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void vg_lite_translate(vg_lite_float_t x, vg_lite_float_t y, vg_lite_matrix_t * matrix)
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{
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/* Set translation matrix. */
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vg_lite_matrix_t t = { { {1.0f, 0.0f, x},
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{0.0f, 1.0f, y},
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{0.0f, 0.0f, 1.0f}
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} };
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/* Multiply with current matrix. */
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multiply(matrix, &t);
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}
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void vg_lite_scale(vg_lite_float_t scale_x, vg_lite_float_t scale_y, vg_lite_matrix_t * matrix)
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{
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/* Set scale matrix. */
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vg_lite_matrix_t s = { { {scale_x, 0.0f, 0.0f},
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{0.0f, scale_y, 0.0f},
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{0.0f, 0.0f, 1.0f}
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} };
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/* Multiply with current matrix. */
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multiply(matrix, &s);
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}
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void vg_lite_rotate(vg_lite_float_t degrees, vg_lite_matrix_t * matrix)
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{
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#ifndef M_PI
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#define M_PI 3.1415926f
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#endif
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/* Convert degrees into radians. */
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vg_lite_float_t angle = degrees / 180.0f * M_PI;
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/* Compuet cosine and sine values. */
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vg_lite_float_t cos_angle = cosf(angle);
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vg_lite_float_t sin_angle = sinf(angle);
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/* Set rotation matrix. */
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vg_lite_matrix_t r = { { {cos_angle, -sin_angle, 0.0f},
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{sin_angle, cos_angle, 0.0f},
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{0.0f, 0.0f, 1.0f}
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} };
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/* Multiply with current matrix. */
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multiply(matrix, &r);
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}
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