Mercurial > hg > orthanc-stone
annotate Framework/Scene2D/Internals/OpenGLTextProgram.cpp @ 611:e3f21a265be5
Added version directive to GLSL shader code + glew init function in sample code
AND commented-out glew init function in StoneInitialize
| author | Benjamin Golinvaux <bgo@osimis.io> |
|---|---|
| date | Tue, 30 Apr 2019 16:07:48 +0200 |
| parents | bbe29efd3d1c |
| children | 9a474e90e832 8b6adfb62a2f |
| rev | line source |
|---|---|
| 592 | 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 "OpenGLTextProgram.h" | |
|
611
e3f21a265be5
Added version directive to GLSL shader code + glew init function in sample code
Benjamin Golinvaux <bgo@osimis.io>
parents:
592
diff
changeset
|
23 #include "OpenGLShaderVersionDirective.h" |
| 592 | 24 |
| 25 #include "../../Fonts/OpenGLTextCoordinates.h" | |
| 26 | |
| 27 #include <Core/OrthancException.h> | |
| 28 | |
| 29 | |
| 30 static const unsigned int COMPONENTS = 2; | |
| 31 | |
| 32 static const char* VERTEX_SHADER = | |
|
611
e3f21a265be5
Added version directive to GLSL shader code + glew init function in sample code
Benjamin Golinvaux <bgo@osimis.io>
parents:
592
diff
changeset
|
33 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE |
| 592 | 34 "attribute vec2 a_texcoord; \n" |
| 35 "attribute vec4 a_position; \n" | |
| 36 "uniform mat4 u_matrix; \n" | |
| 37 "varying vec2 v_texcoord; \n" | |
| 38 "void main() \n" | |
| 39 "{ \n" | |
| 40 " gl_Position = u_matrix * a_position; \n" | |
| 41 " v_texcoord = a_texcoord; \n" | |
| 42 "}"; | |
| 43 | |
| 44 static const char* FRAGMENT_SHADER = | |
|
611
e3f21a265be5
Added version directive to GLSL shader code + glew init function in sample code
Benjamin Golinvaux <bgo@osimis.io>
parents:
592
diff
changeset
|
45 ORTHANC_STONE_OPENGL_SHADER_VERSION_DIRECTIVE |
| 592 | 46 "uniform sampler2D u_texture; \n" |
| 47 "uniform vec3 u_color; \n" | |
| 48 "varying vec2 v_texcoord; \n" | |
| 49 "void main() \n" | |
| 50 "{ \n" | |
| 51 " vec4 v = texture2D(u_texture, v_texcoord); \n" | |
| 52 " gl_FragColor = vec4(u_color * v.w, v.w); \n" // Premultiplied alpha | |
| 53 "}"; | |
| 54 | |
| 55 | |
| 56 namespace OrthancStone | |
| 57 { | |
| 58 namespace Internals | |
| 59 { | |
| 60 OpenGLTextProgram::OpenGLTextProgram(OpenGL::IOpenGLContext& context) : | |
| 61 context_(context) | |
| 62 { | |
| 63 | |
| 64 context_.MakeCurrent(); | |
| 65 | |
| 66 program_.reset(new OpenGL::OpenGLProgram); | |
| 67 program_->CompileShaders(VERTEX_SHADER, FRAGMENT_SHADER); | |
| 68 | |
| 69 positionLocation_ = program_->GetAttributeLocation("a_position"); | |
| 70 textureLocation_ = program_->GetAttributeLocation("a_texcoord"); | |
| 71 } | |
| 72 | |
| 73 | |
| 74 OpenGLTextProgram::Data::Data(OpenGL::IOpenGLContext& context, | |
| 75 const GlyphTextureAlphabet& alphabet, | |
| 76 const TextSceneLayer& layer) : | |
| 77 context_(context), | |
| 78 red_(layer.GetRedAsFloat()), | |
| 79 green_(layer.GetGreenAsFloat()), | |
| 80 blue_(layer.GetBlueAsFloat()), | |
| 81 x_(layer.GetX()), | |
| 82 y_(layer.GetY()), | |
| 83 border_(layer.GetBorder()), | |
| 84 anchor_(layer.GetAnchor()) | |
| 85 { | |
| 86 OpenGL::OpenGLTextCoordinates coordinates(alphabet, layer.GetText()); | |
| 87 textWidth_ = coordinates.GetTextWidth(); | |
| 88 textHeight_ = coordinates.GetTextHeight(); | |
| 89 | |
| 90 if (coordinates.IsEmpty()) | |
| 91 { | |
| 92 coordinatesCount_ = 0; | |
| 93 } | |
| 94 else | |
| 95 { | |
| 96 coordinatesCount_ = coordinates.GetRenderingCoords().size(); | |
| 97 | |
| 98 context_.MakeCurrent(); | |
| 99 glGenBuffers(2, buffers_); | |
| 100 | |
| 101 glBindBuffer(GL_ARRAY_BUFFER, buffers_[0]); | |
| 102 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_, | |
| 103 &coordinates.GetRenderingCoords() [0], GL_STATIC_DRAW); | |
| 104 | |
| 105 glBindBuffer(GL_ARRAY_BUFFER, buffers_[1]); | |
| 106 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * coordinatesCount_, | |
| 107 &coordinates.GetTextureCoords() [0], GL_STATIC_DRAW); | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 | |
| 112 OpenGLTextProgram::Data::~Data() | |
| 113 { | |
| 114 if (!IsEmpty()) | |
| 115 { | |
| 116 context_.MakeCurrent(); | |
| 117 glDeleteBuffers(2, buffers_); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 | |
| 122 GLuint OpenGLTextProgram::Data::GetSceneLocationsBuffer() const | |
| 123 { | |
| 124 if (IsEmpty()) | |
| 125 { | |
| 126 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 127 } | |
| 128 else | |
| 129 { | |
| 130 return buffers_[0]; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 | |
| 135 GLuint OpenGLTextProgram::Data::GetTextureLocationsBuffer() const | |
| 136 { | |
| 137 if (IsEmpty()) | |
| 138 { | |
| 139 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls); | |
| 140 } | |
| 141 else | |
| 142 { | |
| 143 return buffers_[1]; | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 | |
| 148 void OpenGLTextProgram::Apply(OpenGL::OpenGLTexture& fontTexture, | |
| 149 const Data& data, | |
| 150 const AffineTransform2D& transform) | |
| 151 { | |
| 152 if (!data.IsEmpty()) | |
| 153 { | |
| 154 context_.MakeCurrent(); | |
| 155 program_->Use(); | |
| 156 | |
| 157 double dx, dy; // In pixels | |
| 158 ComputeAnchorTranslation(dx, dy, data.GetAnchor(), | |
| 159 data.GetTextWidth(), data.GetTextHeight(), data.GetBorder()); | |
| 160 | |
| 161 double x = data.GetX(); | |
| 162 double y = data.GetY(); | |
| 163 transform.Apply(x, y); | |
| 164 | |
| 165 const AffineTransform2D t = AffineTransform2D::CreateOffset(x + dx, y + dy); | |
| 166 | |
| 167 float m[16]; | |
| 168 t.ConvertToOpenGLMatrix(m, context_.GetCanvasWidth(), context_.GetCanvasHeight()); | |
| 169 | |
| 170 fontTexture.Bind(program_->GetUniformLocation("u_texture")); | |
| 171 glUniformMatrix4fv(program_->GetUniformLocation("u_matrix"), 1, GL_FALSE, m); | |
| 172 glUniform3f(program_->GetUniformLocation("u_color"), | |
| 173 data.GetRed(), data.GetGreen(), data.GetBlue()); | |
| 174 | |
| 175 glBindBuffer(GL_ARRAY_BUFFER, data.GetSceneLocationsBuffer()); | |
| 176 glEnableVertexAttribArray(positionLocation_); | |
| 177 glVertexAttribPointer(positionLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); | |
| 178 | |
| 179 glBindBuffer(GL_ARRAY_BUFFER, data.GetTextureLocationsBuffer()); | |
| 180 glEnableVertexAttribArray(textureLocation_); | |
| 181 glVertexAttribPointer(textureLocation_, COMPONENTS, GL_FLOAT, GL_FALSE, 0, 0); | |
| 182 | |
| 183 glEnable(GL_BLEND); | |
| 184 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); | |
| 185 glDrawArrays(GL_TRIANGLES, 0, data.GetCoordinatesCount() / COMPONENTS); | |
| 186 glDisable(GL_BLEND); | |
| 187 | |
| 188 glDisableVertexAttribArray(positionLocation_); | |
| 189 glDisableVertexAttribArray(textureLocation_); | |
| 190 } | |
| 191 } | |
| 192 } | |
| 193 } |