From a6b8b03f864eac18c106d57e31a79b9078aa9625 Mon Sep 17 00:00:00 2001 From: Paolo Angelelli Date: Thu, 11 Feb 2016 09:44:14 +0100 Subject: OpenGL: add support for compute shaders in GLES 3.1 OpenGL ES 3.1 introduces compute shaders. This patch enables them also in QOpenGLShader/QOpenGLShaderProgram. A GL/GLES example using QOpenGLShaderProgram for compute shaders is also included. Change-Id: I3951a302d7c2b096548f829b9b4578b5a525c453 Reviewed-by: Laszlo Agocs --- src/gui/opengl/qopenglshaderprogram.cpp | 221 +++++++++++++++++++------------- 1 file changed, 130 insertions(+), 91 deletions(-) (limited to 'src/gui/opengl') diff --git a/src/gui/opengl/qopenglshaderprogram.cpp b/src/gui/opengl/qopenglshaderprogram.cpp index f076e10e20..c0c0bb0a03 100644 --- a/src/gui/opengl/qopenglshaderprogram.cpp +++ b/src/gui/opengl/qopenglshaderprogram.cpp @@ -162,6 +162,79 @@ QT_BEGIN_NAMESPACE based on the core feature (requires OpenGL >= 4.3). */ + +// For GLES 3.1/3.2 +#ifndef GL_GEOMETRY_SHADER +#define GL_GEOMETRY_SHADER 0x8DD9 +#endif +#ifndef GL_TESS_CONTROL_SHADER +#define GL_TESS_CONTROL_SHADER 0x8E88 +#endif +#ifndef GL_TESS_EVALUATION_SHADER +#define GL_TESS_EVALUATION_SHADER 0x8E87 +#endif +#ifndef GL_COMPUTE_SHADER +#define GL_COMPUTE_SHADER 0x91B9 +#endif +#ifndef GL_MAX_GEOMETRY_OUTPUT_VERTICES +#define GL_MAX_GEOMETRY_OUTPUT_VERTICES 0x8DE0 +#endif +#ifndef GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS +#define GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS 0x8DE1 +#endif +#ifndef GL_PATCH_VERTICES +#define GL_PATCH_VERTICES 0x8E72 +#endif +#ifndef GL_PATCH_DEFAULT_OUTER_LEVEL +#define GL_PATCH_DEFAULT_OUTER_LEVEL 0x8E74 +#endif +#ifndef GL_PATCH_DEFAULT_INNER_LEVEL +#define GL_PATCH_DEFAULT_INNER_LEVEL 0x8E73 +#endif + +static inline bool isFormatGLES(const QSurfaceFormat &f) +{ + return (f.renderableType() == QSurfaceFormat::OpenGLES); +} + +static inline bool supportsGeometry(const QSurfaceFormat &f) +{ +#ifndef QT_OPENGL_ES_2 + if (!isFormatGLES(f)) + return (f.version() >= qMakePair(3, 2)); + else + return false; +#else + Q_UNUSED(f); + return false; +#endif +} + +static inline bool supportsCompute(const QSurfaceFormat &f) +{ +#ifndef QT_OPENGL_ES_2 + if (!isFormatGLES(f)) + return (f.version() >= qMakePair(4, 3)); + else + return (f.version() >= qMakePair(3, 1)); +#else + return (f.version() >= qMakePair(3, 1)); +#endif +} + +static inline bool supportsTessellation(const QSurfaceFormat &f) +{ +#ifndef QT_OPENGL_ES_2 + if (!isFormatGLES(f)) + return (f.version() >= qMakePair(4, 0)); + else + return false; +#else + Q_UNUSED(f); + return false; +#endif +} + class QOpenGLShaderPrivate : public QObjectPrivate { Q_DECLARE_PUBLIC(QOpenGLShader) @@ -171,22 +244,16 @@ public: , shaderType(type) , compiled(false) , glfuncs(new QOpenGLFunctions(ctx)) -#ifndef QT_OPENGL_ES_2 , supportsGeometryShaders(false) , supportsTessellationShaders(false) -#endif + , supportsComputeShaders(false) { -#ifndef QT_OPENGL_ES_2 - if (!ctx->isOpenGLES()) { - QSurfaceFormat f = ctx->format(); - - // Geometry shaders require OpenGL >= 3.2 - if (shaderType & QOpenGLShader::Geometry) - supportsGeometryShaders = (f.version() >= qMakePair(3, 2)); - else if (shaderType & (QOpenGLShader::TessellationControl | QOpenGLShader::TessellationEvaluation)) - supportsTessellationShaders = (f.version() >= qMakePair(4, 0)); - } -#endif + if (shaderType & QOpenGLShader::Geometry) + supportsGeometryShaders = supportsGeometry(ctx->format()); + else if (shaderType & (QOpenGLShader::TessellationControl | QOpenGLShader::TessellationEvaluation)) + supportsTessellationShaders = supportsTessellation(ctx->format()); + else if (shaderType & QOpenGLShader::Compute) + supportsComputeShaders = supportsCompute(ctx->format()); } ~QOpenGLShaderPrivate(); @@ -197,13 +264,13 @@ public: QOpenGLFunctions *glfuncs; -#ifndef QT_OPENGL_ES_2 // Support for geometry shaders bool supportsGeometryShaders; - // Support for tessellation shaders bool supportsTessellationShaders; -#endif + // Support for compute shaders + bool supportsComputeShaders; + bool create(); bool compile(QOpenGLShader *q); @@ -232,21 +299,15 @@ bool QOpenGLShaderPrivate::create() GLuint shader; if (shaderType == QOpenGLShader::Vertex) { shader = glfuncs->glCreateShader(GL_VERTEX_SHADER); -#if defined(QT_OPENGL_3_2) } else if (shaderType == QOpenGLShader::Geometry && supportsGeometryShaders) { shader = glfuncs->glCreateShader(GL_GEOMETRY_SHADER); -#endif -#if defined(QT_OPENGL_4) } else if (shaderType == QOpenGLShader::TessellationControl && supportsTessellationShaders) { 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) { + } else if (shaderType == QOpenGLShader::Compute && supportsComputeShaders) { shader = glfuncs->glCreateShader(GL_COMPUTE_SHADER); -#endif - } else { + } else if (shaderType == QOpenGLShader::Fragment) { shader = glfuncs->glCreateShader(GL_FRAGMENT_SHADER); } if (!shader) { @@ -3209,10 +3270,8 @@ void QOpenGLShaderProgram::setUniformValueArray(const char *name, const QMatrix4 int QOpenGLShaderProgram::maxGeometryOutputVertices() const { GLint n = 0; -#if defined(QT_OPENGL_3_2) Q_D(const QOpenGLShaderProgram); d->glfuncs->glGetIntegerv(GL_MAX_GEOMETRY_OUTPUT_VERTICES, &n); -#endif return n; } @@ -3236,7 +3295,7 @@ int QOpenGLShaderProgram::maxGeometryOutputVertices() const */ void QOpenGLShaderProgram::setPatchVertexCount(int count) { -#if defined(QT_OPENGL_4) +#ifndef QT_OPENGL_ES_2 Q_D(QOpenGLShaderProgram); if (d->tessellationFuncs) d->tessellationFuncs->glPatchParameteri(GL_PATCH_VERTICES, count); @@ -3255,13 +3314,15 @@ void QOpenGLShaderProgram::setPatchVertexCount(int count) */ int QOpenGLShaderProgram::patchVertexCount() const { +#ifndef QT_OPENGL_ES_2 int patchVertices = 0; -#if defined(QT_OPENGL_4) Q_D(const QOpenGLShaderProgram); if (d->tessellationFuncs) d->tessellationFuncs->glGetIntegerv(GL_PATCH_VERTICES, &patchVertices); -#endif return patchVertices; +#else + return 0; +#endif } /*! @@ -3283,21 +3344,21 @@ int QOpenGLShaderProgram::patchVertexCount() const */ void QOpenGLShaderProgram::setDefaultOuterTessellationLevels(const QVector &levels) { -#if defined(QT_OPENGL_4) - QVector tessLevels = levels; - - // Ensure we have the required 4 outer tessellation levels - // Use default of 1 for missing entries (same as spec) - const int argCount = 4; - if (tessLevels.size() < argCount) { - tessLevels.reserve(argCount); - for (int i = tessLevels.size(); i < argCount; ++i) - tessLevels.append(1.0f); - } - +#ifndef QT_OPENGL_ES_2 Q_D(QOpenGLShaderProgram); - if (d->tessellationFuncs) + if (d->tessellationFuncs) { + QVector tessLevels = levels; + + // Ensure we have the required 4 outer tessellation levels + // Use default of 1 for missing entries (same as spec) + const int argCount = 4; + if (tessLevels.size() < argCount) { + tessLevels.reserve(argCount); + for (int i = tessLevels.size(); i < argCount; ++i) + tessLevels.append(1.0f); + } d->tessellationFuncs->glPatchParameterfv(GL_PATCH_DEFAULT_OUTER_LEVEL, tessLevels.data()); + } #else Q_UNUSED(levels); #endif @@ -3320,13 +3381,15 @@ void QOpenGLShaderProgram::setDefaultOuterTessellationLevels(const QVector QOpenGLShaderProgram::defaultOuterTessellationLevels() const { +#ifndef QT_OPENGL_ES_2 QVector tessLevels(4, 1.0f); -#if defined(QT_OPENGL_4) Q_D(const QOpenGLShaderProgram); if (d->tessellationFuncs) d->tessellationFuncs->glGetFloatv(GL_PATCH_DEFAULT_OUTER_LEVEL, tessLevels.data()); -#endif return tessLevels; +#else + return QVector(); +#endif } /*! @@ -3348,21 +3411,21 @@ QVector QOpenGLShaderProgram::defaultOuterTessellationLevels() const */ void QOpenGLShaderProgram::setDefaultInnerTessellationLevels(const QVector &levels) { -#if defined(QT_OPENGL_4) - QVector tessLevels = levels; - - // Ensure we have the required 2 inner tessellation levels - // Use default of 1 for missing entries (same as spec) - const int argCount = 2; - if (tessLevels.size() < argCount) { - tessLevels.reserve(argCount); - for (int i = tessLevels.size(); i < argCount; ++i) - tessLevels.append(1.0f); - } - +#ifndef QT_OPENGL_ES_2 Q_D(QOpenGLShaderProgram); - if (d->tessellationFuncs) + if (d->tessellationFuncs) { + QVector tessLevels = levels; + + // Ensure we have the required 2 inner tessellation levels + // Use default of 1 for missing entries (same as spec) + const int argCount = 2; + if (tessLevels.size() < argCount) { + tessLevels.reserve(argCount); + for (int i = tessLevels.size(); i < argCount; ++i) + tessLevels.append(1.0f); + } d->tessellationFuncs->glPatchParameterfv(GL_PATCH_DEFAULT_INNER_LEVEL, tessLevels.data()); + } #else Q_UNUSED(levels); #endif @@ -3385,13 +3448,15 @@ void QOpenGLShaderProgram::setDefaultInnerTessellationLevels(const QVector QOpenGLShaderProgram::defaultInnerTessellationLevels() const { +#ifndef QT_OPENGL_ES_2 QVector tessLevels(2, 1.0f); -#if defined(QT_OPENGL_4) Q_D(const QOpenGLShaderProgram); if (d->tessellationFuncs) d->tessellationFuncs->glGetFloatv(GL_PATCH_DEFAULT_INNER_LEVEL, tessLevels.data()); -#endif return tessLevels; +#else + return QVector(); +#endif } @@ -3404,16 +3469,11 @@ QVector QOpenGLShaderProgram::defaultInnerTessellationLevels() const */ bool QOpenGLShaderProgram::hasOpenGLShaderPrograms(QOpenGLContext *context) { -#if !defined(QT_OPENGL_ES_2) if (!context) context = QOpenGLContext::currentContext(); if (!context) return false; return QOpenGLFunctions(context).hasOpenGLFeature(QOpenGLFunctions::Shaders); -#else - Q_UNUSED(context); - return true; -#endif } /*! @@ -3444,33 +3504,12 @@ bool QOpenGLShader::hasOpenGLShaders(ShaderType type, QOpenGLContext *context) if ((type & ~(Geometry | Vertex | Fragment | TessellationControl | TessellationEvaluation | Compute)) || type == 0) return false; - QSurfaceFormat format = context->format(); - if (type == Geometry) { -#ifndef QT_OPENGL_ES_2 - // Geometry shaders require OpenGL 3.2 or newer - QSurfaceFormat format = context->format(); - return (!context->isOpenGLES()) - && (format.version() >= qMakePair(3, 2)); -#else - // No geometry shader support in OpenGL ES2 - return false; -#endif - } else if (type == TessellationControl || type == TessellationEvaluation) { -#if !defined(QT_OPENGL_ES_2) - return (!context->isOpenGLES()) - && (format.version() >= qMakePair(4, 0)); -#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(4, 3)); -#else - // No compute shader support without OpenGL 4.3 or newer - return false; -#endif - } + if (type & QOpenGLShader::Geometry) + return supportsGeometry(context->format()); + else if (type & (QOpenGLShader::TessellationControl | QOpenGLShader::TessellationEvaluation)) + return supportsTessellation(context->format()); + else if (type & QOpenGLShader::Compute) + return supportsCompute(context->format()); // Unconditional support of vertex and fragment shaders implicitly assumes // a minimum OpenGL version of 2.0 -- cgit v1.2.3