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comparison Framework/Scene2D/Internals/OpenGLTextureProgram.cpp @ 591:b66ced2c43d4

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OpenGLTextureProgram
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 26 Apr 2019 12:05:38 +0200
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children e3f21a265be5
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590:5430bcffba57 591:b66ced2c43d4
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2019 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
24 static const unsigned int COMPONENTS = 2;
25 static const unsigned int COUNT = 6; // 2 triangles in 2D
26
27 static const char* VERTEX_SHADER =
28 "attribute vec2 a_texcoord; \n"
29 "attribute vec4 a_position; \n"
30 "uniform mat4 u_matrix; \n"
31 "varying vec2 v_texcoord; \n"
32 "void main() \n"
33 "{ \n"
34 " gl_Position = u_matrix * a_position; \n"
35 " v_texcoord = a_texcoord; \n"
36 "}";
37
38
39 namespace OrthancStone
40 {
41 namespace Internals
42 {
43 void OpenGLTextureProgram::InitializeExecution(OpenGL::OpenGLTexture& texture,
44 const AffineTransform2D& transform)
45 {
46 context_.MakeCurrent();
47 program_->Use();
48
49 AffineTransform2D scale = AffineTransform2D::CreateScaling
50 (texture.GetWidth(), texture.GetHeight());
51
52 AffineTransform2D t = AffineTransform2D::Combine(transform, scale);
53
54 float m[16];
55 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight());
56
57 texture.Bind(program_->GetUniformLocation("u_texture"));
58 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m);
59
60 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
61 glEnableVertexAttribArray(positionLocation_);
62 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
63
64 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
65 glEnableVertexAttribArray(textureLocation_);
66 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0);
67 }
68
69
70 void OpenGLTextureProgram::FinalizeExecution()
71 {
72 glDisableVertexAttribArray(positionLocation_);
73 glDisableVertexAttribArray(textureLocation_);
74 }
75
76
77 OpenGLTextureProgram::OpenGLTextureProgram(OpenGL::IOpenGLContext& context,
78 const char* fragmentShader) :
79 context_(context)
80 {
81 static const float POSITIONS[COMPONENTS * COUNT] = {
82 0, 0,
83 0, 1,
84 1, 0,
85 1, 0,
86 0, 1,
87 1, 1
88 };
89
90 context_.MakeCurrent();
91
92 program_.reset(new OpenGL::OpenGLProgram);
93 program_->CompileShaders(VERTEX_SHADER, fragmentShader);
94
95 positionLocation_ = program_->GetAttributeLocation("a_position");
96 textureLocation_ = program_->GetAttributeLocation("a_texcoord");
97
98 glGenBuffers(2, buffers_);
99
100 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]);
101 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
102
103 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]);
104 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * COMPONENTS * COUNT, POSITIONS, GL_STATIC_DRAW);
105 }
106
107
108 OpenGLTextureProgram::~OpenGLTextureProgram()
109 {
110 context_.MakeCurrent();
111 glDeleteBuffers(2, buffers_);
112 }
113
114
115 void OpenGLTextureProgram::Execution::DrawTriangles()
116 {
117 glDrawArrays(GL_TRIANGLES, 0, COUNT);
118 }
119 }
120 }