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QOpenGLShaderProgram: insert precision defines based on runtime detection

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Given that we can create OpenGL/ES contexts even under a Desktop OpenGL
implementation, we must check the type of the surface we're renderering
on at runtime.

Change-Id: I55004ce918889b3fc094702976500fcfc675bd1a
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
This commit is contained in:
Giuseppe D'Angelo 2013-02-17 12:11:30 +01:00 committed by The Qt Project
parent d711f98bfb
commit 658616b44e
1 changed files with 14 additions and 10 deletions
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24
src/gui/opengl/qopenglshaderprogram.cpp
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@ -49,6 +49,7 @@
#include <QtCore/qvector.h>
#include <QtGui/qtransform.h>
#include <QtGui/QColor>
#include <QtGui/QSurfaceFormat>
#if !defined(QT_OPENGL_ES_2)
#include <QtGui/qopenglfunctions_4_0_core.h>
@ -373,18 +374,12 @@ QOpenGLShader::ShaderType QOpenGLShader::shaderType() const
return d->shaderType;
}
// The precision qualifiers are useful on OpenGL/ES systems,
// but usually not present on desktop systems. Define the
// keywords to empty strings on desktop systems.
#if !defined(QT_OPENGL_ES) || defined(QT_OPENGL_FORCE_SHADER_DEFINES)
#define QOpenGL_DEFINE_QUALIFIERS 1
static const char qualifierDefines[] =
"#define lowp\n"
"#define mediump\n"
"#define highp\n";
#else
#if defined(QT_OPENGL_ES) && !defined(QT_OPENGL_FORCE_SHADER_DEFINES)
// The "highp" qualifier doesn't exist in fragment shaders
// on all ES platforms. When it doesn't exist, use "mediump".
#define QOpenGL_REDEFINE_HIGHP 1
@ -424,10 +419,19 @@ bool QOpenGLShader::compileSourceCode(const char *source)
src.append(source);
srclen.append(GLint(headerLen));
}
#ifdef QOpenGL_DEFINE_QUALIFIERS
src.append(qualifierDefines);
srclen.append(GLint(sizeof(qualifierDefines) - 1));
// The precision qualifiers are useful on OpenGL/ES systems,
// but usually not present on desktop systems.
const QSurfaceFormat currentSurfaceFormat = QOpenGLContext::currentContext()->format();
if (currentSurfaceFormat.renderableType() == QSurfaceFormat::OpenGL
#ifdef QT_OPENGL_FORCE_SHADER_DEFINES
|| true
#endif
) {
src.append(qualifierDefines);
srclen.append(GLint(sizeof(qualifierDefines) - 1));
}
#ifdef QOpenGL_REDEFINE_HIGHP
if (d->shaderType == Fragment) {
src.append(redefineHighp);