source: trunk/src/opengl/qglpixelbuffer_egl.cpp@ 47

Last change on this file since 47 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 7.1 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the QtOpenGL module of the Qt Toolkit.
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40****************************************************************************/
41
42#include <qdebug.h>
43#include "qglpixelbuffer.h"
44#include "qglpixelbuffer_p.h"
45#include "qgl_egl_p.h"
46
47#include <qimage.h>
48#include <private/qgl_p.h>
49
50QT_BEGIN_NAMESPACE
51
52#ifdef EGL_BIND_TO_TEXTURE_RGBA
53#define QGL_RENDER_TEXTURE 1
54#else
55#define QGL_RENDER_TEXTURE 0
56#endif
57
58bool QGLPixelBufferPrivate::init(const QSize &size, const QGLFormat &f, QGLWidget *shareWidget)
59{
60 // Create the EGL context.
61 ctx = new QEglContext();
62 ctx->setApi(QEglContext::OpenGL);
63
64 // Open the EGL display.
65 if (!ctx->openDisplay(0)) {
66 delete ctx;
67 ctx = 0;
68 return false;
69 }
70
71 // Choose an appropriate configuration. We use the best format
72 // we can find, even if it is greater than the requested format.
73 // We try for a pbuffer that is capable of texture rendering if possible.
74 QEglProperties configProps;
75 qt_egl_set_format(configProps, QInternal::Pbuffer, f);
76 configProps.setRenderableType(ctx->api());
77 bool ok = false;
78#if QGL_RENDER_TEXTURE
79 textureFormat = EGL_TEXTURE_RGBA;
80 configProps.setValue(EGL_BIND_TO_TEXTURE_RGBA, EGL_TRUE);
81 ok = ctx->chooseConfig(configProps, QEglContext::BestPixelFormat);
82 if (!ok) {
83 // Try again with RGB texture rendering.
84 textureFormat = EGL_TEXTURE_RGB;
85 configProps.removeValue(EGL_BIND_TO_TEXTURE_RGBA);
86 configProps.setValue(EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE);
87 ok = ctx->chooseConfig(configProps, QEglContext::BestPixelFormat);
88 if (!ok) {
89 // One last try for a pbuffer with no texture rendering.
90 configProps.removeValue(EGL_BIND_TO_TEXTURE_RGB);
91 textureFormat = EGL_NONE;
92 }
93 }
94#else
95 textureFormat = EGL_NONE;
96#endif
97 if (!ok) {
98 if (!ctx->chooseConfig(configProps, QEglContext::BestPixelFormat)) {
99 delete ctx;
100 ctx = 0;
101 return false;
102 }
103 }
104
105 // Retrieve the actual format properties.
106 qt_egl_update_format(*ctx, format);
107
108 // Create the attributes needed for the pbuffer.
109 QEglProperties attribs;
110 attribs.setValue(EGL_WIDTH, size.width());
111 attribs.setValue(EGL_HEIGHT, size.height());
112#if QGL_RENDER_TEXTURE
113 if (textureFormat != EGL_NONE) {
114 attribs.setValue(EGL_TEXTURE_FORMAT, textureFormat);
115 attribs.setValue(EGL_TEXTURE_TARGET, EGL_TEXTURE_2D);
116 }
117#endif
118
119 // Create the pbuffer surface.
120 pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());
121#if QGL_RENDER_TEXTURE
122 if (pbuf == EGL_NO_SURFACE && textureFormat != EGL_NONE) {
123 // Try again with texture rendering disabled.
124 textureFormat = EGL_NONE;
125 attribs.removeValue(EGL_TEXTURE_FORMAT);
126 attribs.removeValue(EGL_TEXTURE_TARGET);
127 pbuf = eglCreatePbufferSurface(ctx->display(), ctx->config(), attribs.properties());
128 }
129#endif
130 if (pbuf == EGL_NO_SURFACE) {
131 qWarning() << "QGLPixelBufferPrivate::init(): Unable to create EGL pbuffer surface:" << QEglContext::errorString(eglGetError());
132 return false;
133 }
134 ctx->setSurface(pbuf);
135
136 // Create a new context for the configuration.
137 QEglContext *shareContext = 0;
138 if (shareWidget && shareWidget->d_func()->glcx)
139 shareContext = shareWidget->d_func()->glcx->d_func()->eglContext;
140 if (!ctx->createContext(shareContext)) {
141 delete ctx;
142 ctx = 0;
143 return false;
144 }
145
146 return true;
147}
148
149bool QGLPixelBufferPrivate::cleanup()
150{
151 eglDestroySurface(QEglContext::defaultDisplay(0), pbuf);
152 return true;
153}
154
155bool QGLPixelBuffer::bindToDynamicTexture(GLuint texture_id)
156{
157#if QGL_RENDER_TEXTURE
158 Q_D(QGLPixelBuffer);
159 if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)
160 return false;
161 glBindTexture(GL_TEXTURE_2D, texture_id);
162 return eglBindTexImage(d->ctx->display(), d->ctx->surface(), EGL_BACK_BUFFER);
163#else
164 Q_UNUSED(texture_id);
165 return false;
166#endif
167}
168
169void QGLPixelBuffer::releaseFromDynamicTexture()
170{
171#if QGL_RENDER_TEXTURE
172 Q_D(QGLPixelBuffer);
173 if (d->invalid || d->textureFormat == EGL_NONE || !d->ctx)
174 return;
175 eglReleaseTexImage(d->ctx->display(), d->ctx->surface(), EGL_BACK_BUFFER);
176#endif
177}
178
179
180GLuint QGLPixelBuffer::generateDynamicTexture() const
181{
182#if QGL_RENDER_TEXTURE
183 Q_D(const QGLPixelBuffer);
184 GLuint texture;
185 glGenTextures(1, &texture);
186 glBindTexture(GL_TEXTURE_2D, texture);
187 if (d->textureFormat == EGL_TEXTURE_RGB)
188 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, d->req_size.width(), d->req_size.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
189 else
190 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, d->req_size.width(), d->req_size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
191 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
192 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
193 return texture;
194#else
195 return 0;
196#endif
197}
198
199bool QGLPixelBuffer::hasOpenGLPbuffers()
200{
201 // See if we have at least 1 configuration that matches the default format.
202 QEglContext ctx;
203 if (!ctx.openDisplay(0))
204 return false;
205 QEglProperties configProps;
206 qt_egl_set_format(configProps, QInternal::Pbuffer, QGLFormat::defaultFormat());
207 configProps.setRenderableType(QEglContext::OpenGL);
208 return ctx.chooseConfig(configProps);
209}
210
211QT_END_NAMESPACE
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