egl: Add a function to convert __GLcontextModes to _EGLConfig.

_eglConfigFromContextModesRec is used to convert a __GLcontextModes to a
_EGLConfig.  Note that the config is not validated.  An invalid mode
is likely to give an invalid config.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

2 files changed, 77 insertions, 0 deletions

diff --git a/src/egl/main/eglconfigutil.c b/src/egl/main/eglconfigutil.c
index c9d00e7982..a5fcdcd287 100644
--- a/src/egl/main/eglconfigutil.c
+++ b/src/egl/main/eglconfigutil.c
@@ -52,6 +52,78 @@ _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode)
 }
 
 
+/**
+ * Convert a __GLcontextModes object to an _EGLConfig.
+ */
+EGLBoolean
+_eglConfigFromContextModesRec(_EGLConfig *conf, const __GLcontextModes *m,
+                              EGLint conformant, EGLint renderable_type)
+{
+   EGLint config_caveat, surface_type;
+
+   /* must be RGBA */
+   if (!m->rgbMode || !(m->renderType & GLX_RGBA_BIT))
+      return EGL_FALSE;
+
+   config_caveat = EGL_NONE;
+   if (m->visualRating == GLX_SLOW_CONFIG)
+      config_caveat = EGL_SLOW_CONFIG;
+
+   if (m->visualRating == GLX_NON_CONFORMANT_CONFIG)
+      conformant &= ~EGL_OPENGL_BIT;
+   if (!(conformant & EGL_OPENGL_ES_BIT))
+      config_caveat = EGL_NON_CONFORMANT_CONFIG;
+
+   surface_type = 0;
+   if (m->drawableType & GLX_WINDOW_BIT)
+      surface_type |= EGL_WINDOW_BIT;
+   if (m->drawableType & GLX_PIXMAP_BIT)
+      surface_type |= EGL_PIXMAP_BIT;
+   if (m->drawableType & GLX_PBUFFER_BIT)
+      surface_type |= EGL_PBUFFER_BIT;
+
+   SET_CONFIG_ATTRIB(conf, EGL_BUFFER_SIZE, m->rgbBits);
+   SET_CONFIG_ATTRIB(conf, EGL_RED_SIZE, m->redBits);
+   SET_CONFIG_ATTRIB(conf, EGL_GREEN_SIZE, m->greenBits);
+   SET_CONFIG_ATTRIB(conf, EGL_BLUE_SIZE, m->blueBits);
+   SET_CONFIG_ATTRIB(conf, EGL_ALPHA_SIZE, m->alphaBits);
+
+   SET_CONFIG_ATTRIB(conf, EGL_BIND_TO_TEXTURE_RGB, m->bindToTextureRgb);
+   SET_CONFIG_ATTRIB(conf, EGL_BIND_TO_TEXTURE_RGBA, m->bindToTextureRgba);
+   SET_CONFIG_ATTRIB(conf, EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER);
+   SET_CONFIG_ATTRIB(conf, EGL_CONFIG_CAVEAT, config_caveat);
+
+   SET_CONFIG_ATTRIB(conf, EGL_CONFORMANT, conformant);
+   SET_CONFIG_ATTRIB(conf, EGL_DEPTH_SIZE, m->depthBits);
+   SET_CONFIG_ATTRIB(conf, EGL_LEVEL, m->level);
+   SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_WIDTH, m->maxPbufferWidth);
+   SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_HEIGHT, m->maxPbufferHeight);
+   SET_CONFIG_ATTRIB(conf, EGL_MAX_PBUFFER_PIXELS, m->maxPbufferPixels);
+
+   SET_CONFIG_ATTRIB(conf, EGL_NATIVE_RENDERABLE, m->xRenderable);
+   SET_CONFIG_ATTRIB(conf, EGL_NATIVE_VISUAL_ID, m->visualID);
+   SET_CONFIG_ATTRIB(conf, EGL_NATIVE_VISUAL_TYPE, m->visualType);
+   SET_CONFIG_ATTRIB(conf, EGL_RENDERABLE_TYPE, renderable_type);
+   SET_CONFIG_ATTRIB(conf, EGL_SAMPLE_BUFFERS, m->sampleBuffers);
+   SET_CONFIG_ATTRIB(conf, EGL_SAMPLES, m->samples);
+   SET_CONFIG_ATTRIB(conf, EGL_STENCIL_SIZE, m->stencilBits);
+
+   SET_CONFIG_ATTRIB(conf, EGL_SURFACE_TYPE, surface_type);
+
+   /* what to do with GLX_TRANSPARENT_INDEX? */
+   if (m->transparentPixel == GLX_TRANSPARENT_RGB) {
+      SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_TYPE, EGL_TRANSPARENT_RGB);
+      SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_RED_VALUE, m->transparentRed);
+      SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_GREEN_VALUE, m->transparentGreen);
+      SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_BLUE_VALUE, m->transparentBlue);
+   }
+   else {
+      SET_CONFIG_ATTRIB(conf, EGL_TRANSPARENT_TYPE, EGL_NONE);
+   }
+
+   return EGL_TRUE;
+}
+
 
 /**
  * Creates a set of \c _EGLConfigs that a driver will expose.
diff --git a/src/egl/main/eglconfigutil.h b/src/egl/main/eglconfigutil.h
index 820244611c..ad85079890 100644
--- a/src/egl/main/eglconfigutil.h
+++ b/src/egl/main/eglconfigutil.h
@@ -12,6 +12,11 @@ _eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode);
 
 
 extern EGLBoolean
+_eglConfigFromContextModesRec(_EGLConfig *conf, const __GLcontextModes *m,
+                              EGLint conformant, EGLint renderable_type);
+
+
+extern EGLBoolean
 _eglFillInConfigs( _EGLConfig *configs,
                    EGLenum fb_format, EGLenum fb_type,
                    const uint8_t * depth_bits, const uint8_t * stencil_bits,