Mercurial > hg > orthanc-stone
diff OrthancStone/Sources/Scene2D/Internals/OpenGLTextureProgram.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
---|---|
date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/Scene2D/Internals/OpenGLTextureProgram.cpp@30deba7bc8e2 |
children | 92fca2b3ba3d |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/OrthancStone/Sources/Scene2D/Internals/OpenGLTextureProgram.cpp Tue Jul 07 16:21:02 2020 +0200 @@ -0,0 +1,137 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2020 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "OpenGLTextureProgram.h" +#include "OpenGLShaderVersionDirective.h" + +#include <OrthancException.h> + +static const unsigned int COMPONENTS = 2; +static const unsigned int COUNT = 6; // 2 triangles in 2D + +static const char* VERTEX_SHADER = + ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE + "attribute vec2 a_texcoord; \n" + "attribute vec4 a_position; \n" + "uniform mat4 u_matrix; \n" + "varying vec2 v_texcoord; \n" + "void main() \n" + "{ \n" + " gl_Position = u_matrix * a_position; \n" + " v_texcoord = a_texcoord; \n" + "}"; + + +namespace OrthancStone +{ + namespace Internals + { + void OpenGLTextureProgram::InitializeExecution(OpenGL::OpenGLTexture& texture, + const AffineTransform2D& transform) + { + if (!context_.IsContextLost()) + { + context_.MakeCurrent(); + program_->Use(); + + AffineTransform2D scale = AffineTransform2D::CreateScaling + (texture.GetWidth(), texture.GetHeight()); + + AffineTransform2D t = AffineTransform2D::Combine(transform, scale); + + float m[16]; + t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight()); + + texture.Bind(program_->GetUniformLocation("u_texture")); + glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m); + + glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]); + glEnableVertexAttribArray(positionLocation_); + glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); + + glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]); + glEnableVertexAttribArray(textureLocation_); + glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); + } + } + + void OpenGLTextureProgram::FinalizeExecution() + { + if (!context_.IsContextLost()) + { + glDisableVertexAttribArray(positionLocation_); + glDisableVertexAttribArray(textureLocation_); + } + } + + OpenGLTextureProgram::OpenGLTextureProgram(OpenGL::IOpenGLContext& context, + const char* fragmentShader) : + context_(context) + { + static const float POSITIONS[COMPONENTS * COUNT] = { + 0, 0, + 0, 1, + 1, 0, + 1, 0, + 0, 1, + 1, 1 + }; + + if (!context_.IsContextLost()) + { + context_.MakeCurrent(); + + program_.reset(new OpenGL::OpenGLProgram(context_)); + program_->CompileShaders(VERTEX_SHADER, fragmentShader); + + positionLocation_ = program_->GetAttributeLocation("a_position"); + textureLocation_ = program_->GetAttributeLocation("a_texcoord"); + + glGenBuffers(2, buffers_); + + glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]); + glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW); + + glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]); + glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW); + } + } + + OpenGLTextureProgram::~OpenGLTextureProgram() + { + if (!context_.IsContextLost()) + { + ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("OpenGLTextureProgram::~OpenGLTextureProgram() | About to call glDeleteBuffers"); + context_.MakeCurrent(); + glDeleteBuffers(2, buffers_); + } + } + + + void OpenGLTextureProgram::Execution::DrawTriangles() + { + if (!that_.context_.IsContextLost()) + { + glDrawArrays(GL_TRIANGLES, 0, COUNT); + } + } + } +}