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OpenGL: Add support for the Compute shader stage

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Change-Id: Ibb1b79358758c2adf818af8c6fcd5c379efad8c3
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
This commit is contained in:
Sean Harmer 2013-03-01 16:32:04 +00:00 committed by The Qt Project
parent 7e5d1c1c2f
commit 8c4d02ef87
3 changed files with 17 additions and 2 deletions
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1
src/gui/opengl/qopengl.h
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@ -108,6 +108,7 @@ typedef GLfloat GLdouble;
# endif
#if !defined(Q_OS_MAC)
# define QT_OPENGL_4
# define QT_OPENGL_4_3
#endif
#endif

15
src/gui/opengl/qopenglshaderprogram.cpp
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@ -156,6 +156,8 @@ QT_BEGIN_NAMESPACE
shading language (GLSL), based on the core feature (requires OpenGL >= 4.0).
\value TessellationEvaluation Tessellation evaluation shaders written in the OpenGL
shading language (GLSL), based on the core feature (requires OpenGL >= 4.0).
\value Compute Compute shaders written in the OpenGL shading language (GLSL),
based on the core feature (requires OpenGL >= 4.3).
*/
class QOpenGLShaderPrivate : public QObjectPrivate
@ -235,6 +237,10 @@ bool QOpenGLShaderPrivate::create()
shader = glfuncs->glCreateShader(GL_TESS_CONTROL_SHADER);
} else if (shaderType == QOpenGLShader::TessellationEvaluation && supportsTessellationShaders) {
shader = glfuncs->glCreateShader(GL_TESS_EVALUATION_SHADER);
#endif
#if defined(QT_OPENGL_4_3)
} else if (shaderType == QOpenGLShader::Compute) {
shader = glfuncs->glCreateShader(GL_COMPUTE_SHADER);
#endif
} else {
shader = glfuncs->glCreateShader(GL_FRAGMENT_SHADER);
@ -3230,7 +3236,7 @@ bool QOpenGLShader::hasOpenGLShaders(ShaderType type, QOpenGLContext *context)
if (!context)
return false;
if ((type & ~(Geometry | Vertex | Fragment | TessellationControl | TessellationEvaluation)) || type == 0)
if ((type & ~(Geometry | Vertex | Fragment | TessellationControl | TessellationEvaluation | Compute)) || type == 0)
return false;
QSurfaceFormat format = context->format();
@ -3249,6 +3255,13 @@ bool QOpenGLShader::hasOpenGLShaders(ShaderType type, QOpenGLContext *context)
#else
// No tessellation shader support in OpenGL ES2
return false;
#endif
} else if (type == Compute) {
#if defined(QT_OPENGL_4_3)
return (format.version() >= qMakePair<int, int>(4, 3));
#else
// No compute shader support without OpenGL 4.3 or newer
return false;
#endif
}

3
src/gui/opengl/qopenglshaderprogram.h
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@ -67,7 +67,8 @@ public:
Fragment = 0x0002,
Geometry = 0x0004,
TessellationControl = 0x0008,
TessellationEvaluation = 0x0010
TessellationEvaluation = 0x0010,
Compute = 0x0020
};
Q_DECLARE_FLAGS(ShaderType, ShaderTypeBit)