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#include <mbgl/gl/context.hpp>
#include <mbgl/util/offscreen_texture.hpp>
#include <cassert>
namespace mbgl {
void OffscreenTexture::bind(gl::Context& context,
std::array<uint16_t, 2> size) {
assert(size[0] > 0 && size[1] > 0);
if (raster.getSize() != size) {
raster.load(PremultipliedImage(size[0], size[1], nullptr));
raster.upload(context, 0);
}
if (!framebuffer) {
framebuffer = context.createFramebuffer();
context.bindFramebuffer = *framebuffer;
MBGL_CHECK_ERROR(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
raster.getID(), 0));
GLenum status = MBGL_CHECK_ERROR(glCheckFramebufferStatus(GL_FRAMEBUFFER));
if (status != GL_FRAMEBUFFER_COMPLETE) {
switch (status) {
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
throw std::runtime_error("Couldn't create framebuffer: incomplete attachment");
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
throw std::runtime_error(
"Couldn't create framebuffer: incomplete missing attachment");
#ifdef GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
throw std::runtime_error("Couldn't create framebuffer: incomplete draw buffer");
#endif
#ifdef GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
throw std::runtime_error("Couldn't create framebuffer: incomplete read buffer");
#endif
#ifdef GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
throw std::runtime_error("Couldn't create framebuffer: incomplete dimensions");
#endif
case GL_FRAMEBUFFER_UNSUPPORTED:
throw std::runtime_error("Couldn't create framebuffer: unsupported");
default:
throw std::runtime_error("Couldn't create framebuffer: other");
}
}
} else {
context.bindFramebuffer = *framebuffer;
}
context.viewport = { { 0, 0, static_cast<GLint>(size[0]), static_cast<GLint>(size[1]) } };
}
Raster& OffscreenTexture::getTexture() {
return raster;
}
std::array<uint16_t, 2> OffscreenTexture::getSize() const {
return raster.getSize();
}
} // namespace mbgl
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