76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
#include <Dengine\Texture.h>
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namespace Dengine
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{
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Texture::Texture()
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: id(0)
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, width(0)
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, height(0)
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, internalFormat(GL_RGBA)
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, imageFormat(GL_RGB)
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, wrapS(GL_REPEAT)
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, wrapT(GL_REPEAT)
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, filterMinification(GL_LINEAR)
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, filterMagnification(GL_LINEAR)
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{
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glGenTextures(1, &this->id);
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}
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enum BytesPerPixel
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{
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Greyscale = 1,
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GreyscaleAlpha = 2,
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RGB = 3,
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RGBA = 4,
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};
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INTERNAL GLint getGLFormat(BytesPerPixel bytesPerPixel, b32 srgb)
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{
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switch (bytesPerPixel)
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{
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case Greyscale:
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return GL_LUMINANCE;
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case GreyscaleAlpha:
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return GL_LUMINANCE_ALPHA;
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case RGB:
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return (srgb ? GL_SRGB : GL_RGB);
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case RGBA:
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return (srgb ? GL_SRGB_ALPHA : GL_RGBA);
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default:
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// TODO(doyle): Invalid
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// std::cout << "getGLFormat() invalid bytesPerPixel: "
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// << bytesPerPixel << std::endl;
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return GL_LUMINANCE;
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}
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}
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void Texture::generate(const GLuint width, const GLuint height, const GLint bytesPerPixel,
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const u8 *const image)
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{
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// TODO(doyle): Let us set the parameters gl params as well
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this->width = width;
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this->height = height;
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glBindTexture(GL_TEXTURE_2D, this->id);
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/* Load image into texture */
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// TODO(doyle) Figure out the gl format
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this->imageFormat = getGLFormat(static_cast<enum BytesPerPixel>(bytesPerPixel), FALSE);
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glTexImage2D(GL_TEXTURE_2D, 0, this->internalFormat, this->width, this->height, 0,
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this->imageFormat, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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/* Set parameter of currently bound texture */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, this->wrapS);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, this->wrapT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, this->filterMinification);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, this->filterMagnification);
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/* Unbind and clean up */
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void Texture::bind() const { glBindTexture(GL_TEXTURE_2D, this->id); }
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}
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