1 /**

     2  * ShaderShark

     3  * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)

     4  *

     5  * This program is free software: you can redistribute it and/or modify

     6  * it under the terms of the GNU General Public License as published by

     7  * the Free Software Foundation, version 3 of the License.

     8  *

     9  * This program is distributed in the hope that it will be useful,

    10  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    12  * GNU General Public License for more details.

    13  *

    14  * You should have received a copy of the GNU General Public License

    15  * along with this program. If not, see <http://www.gnu.org/licenses/>.

    16  */

    17 

    18 #include <string>

    19 #include <stdexcept>

    20 

    21 #include "opengl.h"

    22 #include "Texture.h"

    23 

    24 class Texture::Impl {

    25 public:

    26 	GLuint id;

    27 	std::string fileName;

    28 	int width;

    29 	int height;

    30 };

    31 

    32 Texture::Texture(

    33 		int width,

    34 		int height,

    35 		const Buffer& img,

    36 		const std::string& fileName) : impl(new Impl()) {

    37 	impl->fileName = fileName;

    38 	glGenTextures(1, &impl->id);

    39 	update(width, height, img);

    40 }

    41 

    42 Texture::~Texture() {

    43 	glDeleteTextures(1, &impl->id);

    44 	delete impl;

    45 }

    46 

    47 GLuint Texture::getId() const {

    48 	return impl->id;

    49 }

    50 

    51 const std::string Texture::getFileName() const {

    52 	return impl->fileName;

    53 }

    54 

    55 int Texture::getWidth() const {

    56 	return impl->width;

    57 }

    58 

    59 int Texture::getHeight() const {

    60 	return impl->height;

    61 }

    62 

    63 GLfloat Texture::getRatio() const {

    64 	return (GLfloat) impl->width / (GLfloat) impl->height;

    65 }

    66 

    67 void Texture::update(int width, int height, const Buffer& img) {

    68 	impl->width = width;

    69 	impl->height = height;

    70 

    71 	if (img.getSize() != impl->width * impl->height * 4)

    72 		throw std::invalid_argument("invalid image size");

    73 

    74 	glBindTexture(GL_TEXTURE_2D, impl->id);

    75 	auto GLT2D = GL_TEXTURE_2D;

    76 	glTexImage2D(GLT2D, 0, GL_RGBA,

    77 			impl->width, impl->height,

    78 			0, GL_RGBA, GL_UNSIGNED_BYTE,

    79 			img.getData());

    80 	glTexParameteri(GLT2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

    81 	glTexParameteri(GLT2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    82 	glTexParameteri(GLT2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    83 	glTexParameteri(GLT2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    84 	glGenerateMipmap(GLT2D);

    85 	checkError(&std::cerr);

    86 }