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// Copyright (c) 2012-2017 VideoStitch SAS
// Copyright (c) 2018 stitchEm
#include "glAllocator.hpp"
#include <sstream>
namespace VideoStitch {
namespace Core {
Status initGlew() {
#ifndef GLEWLIB_UNSUPPORTED
GLenum glerr = glewInit();
if (glerr != GLEW_OK) {
return Status{Origin::GPU, ErrType::RuntimeError, "Unable to initialize glew"};
}
#endif
return Status::OK();
}
PotentialValue<GLuint> createSourceSurfaceTexture(size_t width, size_t height) {
// clear error flag before mapping to CUDA/OpenCL
GLenum glerr = glGetError();
while (glerr != GL_NO_ERROR) {
glerr = glGetError();
}
FAIL_RETURN(initGlew());
glEnable(GL_TEXTURE_2D);
GLuint texture;
glGenTextures(1, (GLuint*)&texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, (GLsizei)width, (GLsizei)height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glerr = glGetError();
if (glerr != GL_NO_ERROR) {
return Status{Origin::GPU, ErrType::RuntimeError,
"Could not allocate OpenGL Surface. OpenGL error " + std::to_string(glerr)};
}
return texture;
}
PotentialValue<GLuint> createPanoSurfacePB(size_t width, size_t height) {
FAIL_RETURN(initGlew());
glEnable(GL_TEXTURE_2D);
// clear error flag before mapping to CUDA/OpenCL
GLenum glerr = glGetError();
while (glerr != GL_NO_ERROR) {
glerr = glGetError();
}
if (width * height * 4 > std::numeric_limits<int32_t>::max()) {
std::stringstream msg;
msg << "Could not allocate OpenGL Surface of size " << width * height * 4;
msg << ". Maximum supported texture size: " << std::numeric_limits<int32_t>::max();
return Status{Origin::GPU, ErrType::OutOfResources, msg.str()};
}
GLuint pixelbuffer;
glGenBuffers(1, (GLuint*)&pixelbuffer);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixelbuffer);
glBufferData(GL_PIXEL_UNPACK_BUFFER, width * height * 4, NULL, GL_STREAM_DRAW);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glerr = glGetError();
if (glerr != GL_NO_ERROR) {
return Status{Origin::GPU, ErrType::RuntimeError,
"Could not allocate OpenGL Surface. OpenGL error " + std::to_string(glerr)};
}
return pixelbuffer;
}
} // namespace Core
} // namespace VideoStitch