Mercurial > hg > orthanc-stone
comparison OrthancStone/Sources/Scene2D/Internals/OpenGLTextureProgram.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/Scene2D/Internals/OpenGLTextureProgram.cpp@30deba7bc8e2 |
children | 92fca2b3ba3d |
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1511:9dfeee74c1e6 | 1512:244ad1e4e76a |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium | |
6 * | |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU Affero General Public License | |
9 * as published by the Free Software Foundation, either version 3 of | |
10 * the License, or (at your option) any later version. | |
11 * | |
12 * This program is distributed in the hope that it will be useful, but | |
13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 * Affero General Public License for more details. | |
16 * | |
17 * You should have received a copy of the GNU Affero General Public License | |
18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 **/ | |
20 | |
21 | |
22 #include "OpenGLTextureProgram.h" | |
23 #include "OpenGLShaderVersionDirective.h" | |
24 | |
25 #include <OrthancException.h> | |
26 | |
27 static const unsigned int COMPONENTS = 2; | |
28 static const unsigned int COUNT = 6; // 2 triangles in 2D | |
29 | |
30 static const char* VERTEX_SHADER = | |
31 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE | |
32 "attribute vec2 a_texcoord; \n" | |
33 "attribute vec4 a_position; \n" | |
34 "uniform mat4 u_matrix; \n" | |
35 "varying vec2 v_texcoord; \n" | |
36 "void main() \n" | |
37 "{ \n" | |
38 " gl_Position = u_matrix * a_position; \n" | |
39 " v_texcoord = a_texcoord; \n" | |
40 "}"; | |
41 | |
42 | |
43 namespace OrthancStone | |
44 { | |
45 namespace Internals | |
46 { | |
47 void OpenGLTextureProgram::InitializeExecution(OpenGL::OpenGLTexture& texture, | |
48 const AffineTransform2D& transform) | |
49 { | |
50 if (!context_.IsContextLost()) | |
51 { | |
52 context_.MakeCurrent(); | |
53 program_->Use(); | |
54 | |
55 AffineTransform2D scale = AffineTransform2D::CreateScaling | |
56 (texture.GetWidth(), texture.GetHeight()); | |
57 | |
58 AffineTransform2D t = AffineTransform2D::Combine(transform, scale); | |
59 | |
60 float m[16]; | |
61 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight()); | |
62 | |
63 texture.Bind(program_->GetUniformLocation("u_texture")); | |
64 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m); | |
65 | |
66 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]); | |
67 glEnableVertexAttribArray(positionLocation_); | |
68 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); | |
69 | |
70 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]); | |
71 glEnableVertexAttribArray(textureLocation_); | |
72 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); | |
73 } | |
74 } | |
75 | |
76 void OpenGLTextureProgram::FinalizeExecution() | |
77 { | |
78 if (!context_.IsContextLost()) | |
79 { | |
80 glDisableVertexAttribArray(positionLocation_); | |
81 glDisableVertexAttribArray(textureLocation_); | |
82 } | |
83 } | |
84 | |
85 OpenGLTextureProgram::OpenGLTextureProgram(OpenGL::IOpenGLContext& context, | |
86 const char* fragmentShader) : | |
87 context_(context) | |
88 { | |
89 static const float POSITIONS[COMPONENTS * COUNT] = { | |
90 0, 0, | |
91 0, 1, | |
92 1, 0, | |
93 1, 0, | |
94 0, 1, | |
95 1, 1 | |
96 }; | |
97 | |
98 if (!context_.IsContextLost()) | |
99 { | |
100 context_.MakeCurrent(); | |
101 | |
102 program_.reset(new OpenGL::OpenGLProgram(context_)); | |
103 program_->CompileShaders(VERTEX_SHADER, fragmentShader); | |
104 | |
105 positionLocation_ = program_->GetAttributeLocation("a_position"); | |
106 textureLocation_ = program_->GetAttributeLocation("a_texcoord"); | |
107 | |
108 glGenBuffers(2, buffers_); | |
109 | |
110 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]); | |
111 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW); | |
112 | |
113 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]); | |
114 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW); | |
115 } | |
116 } | |
117 | |
118 OpenGLTextureProgram::~OpenGLTextureProgram() | |
119 { | |
120 if (!context_.IsContextLost()) | |
121 { | |
122 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("OpenGLTextureProgram::~OpenGLTextureProgram() | About to call glDeleteBuffers"); | |
123 context_.MakeCurrent(); | |
124 glDeleteBuffers(2, buffers_); | |
125 } | |
126 } | |
127 | |
128 | |
129 void OpenGLTextureProgram::Execution::DrawTriangles() | |
130 { | |
131 if (!that_.context_.IsContextLost()) | |
132 { | |
133 glDrawArrays(GL_TRIANGLES, 0, COUNT); | |
134 } | |
135 } | |
136 } | |
137 } |