void Texture::draw() {
bind();
quad.draw();
unbind();
checkGLError("Texture::draw quad draw");
}
unsigned char *Texture::mapData() {
if(!texture) {
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pboTexture);
texture = (unsigned char*)(glMapBuffer(GL_PIXEL_UNPACK_BUFFER,
GL_READ_WRITE));
}
checkGLError("Texture::mapData");
return texture;
}
void Texture::createTexture() {
glGenTextures(1, &idTexture);
glBindTexture(GL_TEXTURE_2D, idTexture);
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_WRAP_S, GLint(GL_REPEAT));
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_WRAP_T, GLint(GL_REPEAT));
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, width, height);
checkGLError("Texture::createTexture glTexStorage2D");
glGenBuffers(1, &pboTexture);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pboTexture);
glBufferData(GL_PIXEL_UNPACK_BUFFER,
getWidth() * getHeight() * getChannelCount(),
nullptr, GL_DYNAMIC_DRAW);
checkGLError("Texture::createTexture glBufferData");
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}
void Texture::uploadData() {
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pboTexture);
bind();
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height,
GL_BGRA, GL_UNSIGNED_BYTE, 0);
unbind();
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
checkGLError("Texture::uploadData");
}
void Texture::unmapData() {
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
checkGLError("Texture::unmapData");
texture = nullptr;
}