egl: Handle dri configs with floating point pixel data

In the case that __DRI_ATTRIB_FLOAT_BIT is set in the dri config, set
EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT in the egl config. Add a field to the
platform driver visual to indicate if it has components that are in floating
point form.

Signed-off-by: Kevin Strasser <[email protected]>
Reviewed-by: Adam Jackson <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

4 files changed, 30 insertions, 2 deletions

diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 56ebcb7c403..a7c0f33f948 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -239,6 +239,17 @@ dri2_get_shifts_and_sizes(const __DRIcoreExtension *core,
    core->getConfigAttrib(config, __DRI_ATTRIB_ALPHA_SIZE, &sizes[3]);
 }
 
+void
+dri2_get_render_type_float(const __DRIcoreExtension *core,
+                           const __DRIconfig *config,
+                           bool *is_float)
+{
+   unsigned int render_type;
+
+   core->getConfigAttrib(config, __DRI_ATTRIB_RENDER_TYPE, &render_type);
+   *is_float = (render_type & __DRI_ATTRIB_FLOAT_BIT) ? true : false;
+}
+
 struct dri2_egl_config *
 dri2_add_config(_EGLDisplay *disp, const __DRIconfig *dri_config, int id,
                 EGLint surface_type, const EGLint *attr_list,
@@ -268,6 +279,9 @@ dri2_add_config(_EGLDisplay *disp, const __DRIconfig *dri_config, int id,
 
       switch (attrib) {
       case __DRI_ATTRIB_RENDER_TYPE:
+         if (value & __DRI_ATTRIB_FLOAT_BIT)
+            _eglSetConfigKey(&base, EGL_COLOR_COMPONENT_TYPE_EXT,
+                             EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT);
          if (value & __DRI_ATTRIB_RGBA_BIT)
             value = EGL_RGB_BUFFER;
          else if (value & __DRI_ATTRIB_LUMINANCE_BIT)
diff --git a/src/egl/drivers/dri2/egl_dri2.h b/src/egl/drivers/dri2/egl_dri2.h
index 5a148f12118..2a8307ab321 100644
--- a/src/egl/drivers/dri2/egl_dri2.h
+++ b/src/egl/drivers/dri2/egl_dri2.h
@@ -409,6 +409,11 @@ dri2_get_shifts_and_sizes(const __DRIcoreExtension *core,
 		          const __DRIconfig *config, int *shifts,
 			  unsigned int *sizes);
 
+void
+dri2_get_render_type_float(const __DRIcoreExtension *core,
+                           const __DRIconfig *config,
+                           bool *is_float);
+
 struct dri2_egl_config *
 dri2_add_config(_EGLDisplay *disp, const __DRIconfig *dri_config, int id,
                 EGLint surface_type, const EGLint *attr_list,
diff --git a/src/egl/drivers/dri2/platform_drm.c b/src/egl/drivers/dri2/platform_drm.c
index 56b8e59d2c5..f2491054fe6 100644
--- a/src/egl/drivers/dri2/platform_drm.c
+++ b/src/egl/drivers/dri2/platform_drm.c
@@ -98,6 +98,7 @@ dri2_drm_config_is_compatible(struct dri2_egl_display *dri2_dpy,
    const struct gbm_dri_visual *visual = NULL;
    int shifts[4];
    unsigned int sizes[4];
+   bool is_float;
    int i;
 
    /* Check that the EGLConfig being used to render to the surface is
@@ -107,6 +108,8 @@ dri2_drm_config_is_compatible(struct dri2_egl_display *dri2_dpy,
     */
    dri2_get_shifts_and_sizes(dri2_dpy->core, config, shifts, sizes);
 
+   dri2_get_render_type_float(dri2_dpy->core, config, &is_float);
+
    for (i = 0; i < dri2_dpy->gbm_dri->num_visuals; i++) {
       visual = &dri2_dpy->gbm_dri->visual_table[i];
       if (visual->gbm_format == surface->format)
@@ -123,7 +126,8 @@ dri2_drm_config_is_compatible(struct dri2_egl_display *dri2_dpy,
        sizes[0] != visual->rgba_sizes.red ||
        sizes[1] != visual->rgba_sizes.green ||
        sizes[2] != visual->rgba_sizes.blue ||
-       (sizes[3] > 0 && sizes[3] != visual->rgba_sizes.alpha)) {
+       (sizes[3] > 0 && sizes[3] != visual->rgba_sizes.alpha) ||
+       is_float != visual->is_float) {
       return false;
    }
 
@@ -617,9 +621,12 @@ drm_add_configs_for_visuals(_EGLDriver *drv, _EGLDisplay *disp)
       const __DRIconfig *config = dri2_dpy->driver_configs[i];
       int shifts[4];
       unsigned int sizes[4];
+      bool is_float;
 
       dri2_get_shifts_and_sizes(dri2_dpy->core, config, shifts, sizes);
 
+      dri2_get_render_type_float(dri2_dpy->core, config, &is_float);
+
       for (unsigned j = 0; j < num_visuals; j++) {
          struct dri2_egl_config *dri2_conf;
 
@@ -630,7 +637,8 @@ drm_add_configs_for_visuals(_EGLDriver *drv, _EGLDisplay *disp)
              visuals[j].rgba_sizes.red != sizes[0] ||
              visuals[j].rgba_sizes.green != sizes[1] ||
              visuals[j].rgba_sizes.blue != sizes[2] ||
-             visuals[j].rgba_sizes.alpha != sizes[3])
+             visuals[j].rgba_sizes.alpha != sizes[3] ||
+             visuals[j].is_float != is_float)
             continue;
 
          const EGLint attr_list[] = {
diff --git a/src/gbm/backends/dri/gbm_driint.h b/src/gbm/backends/dri/gbm_driint.h
index 75299bdb846..a8bfa39e522 100644
--- a/src/gbm/backends/dri/gbm_driint.h
+++ b/src/gbm/backends/dri/gbm_driint.h
@@ -55,6 +55,7 @@ struct gbm_dri_visual {
       unsigned int blue;
       unsigned int alpha;
    } rgba_sizes;
+   bool is_float;
 };
 
 struct gbm_dri_device {