Program Listing for File video_frame.cpp

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/* * Copyright (c) 2022, NVIDIA CORPORATION. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "video_frame.hpp" #include <string> #include "opengl_utils.hpp" namespace nvidia { namespace holoscan { namespace visualizer_tool_tracking { gxf_result_t VideoFrame::start() { glGenVertexArrays(1, &vao_); glCreateSamplers(1, &sampler_); glSamplerParameteri(sampler_, GL_TEXTURE_WRAP_S, GL_REPEAT); glSamplerParameteri(sampler_, GL_TEXTURE_WRAP_T, GL_REPEAT); glSamplerParameteri(sampler_, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glSamplerParameteri(sampler_, GL_TEXTURE_MAG_FILTER, GL_LINEAR); if (!createGLSLShaderFromFile(GL_VERTEX_SHADER, vertex_shader_, vertex_shader_file_path_)) { GXF_LOG_ERROR("Failed to create GLSLvertex shader"); return GXF_FAILURE; } if (!createGLSLShaderFromFile(GL_FRAGMENT_SHADER, fragment_shader_, fragment_shader_file_path_)) { GXF_LOG_ERROR("Failed to create GLSL fragment shader"); return GXF_FAILURE; } if (!linkGLSLProgram(vertex_shader_, fragment_shader_, program_)) { GXF_LOG_ERROR("Failed to link GLSL program."); return GXF_FAILURE; } GXF_LOG_INFO("Build GLSL shaders and program succesfully"); return GXF_SUCCESS; } gxf_result_t VideoFrame::tick() { glActiveTexture(GL_TEXTURE0); glBindSampler(0, sampler_); glBindTexture(GL_TEXTURE_2D, frame_tex_); glUseProgram(program_); glBindVertexArray(vao_); glDrawArrays(GL_TRIANGLE_STRIP, 0, 3); glBindTexture(GL_TEXTURE_2D, 0); return GXF_SUCCESS; } gxf_result_t VideoFrame::stop() { return GXF_SUCCESS; } } // namespace visualizer_tool_tracking } // namespace holoscan } // namespace nvidia

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