gsk: Use the appropriate GLSL version

The GLSL versions are:

  OpenGL 2.1: #version 110
  OpenGL 3.0: #version 130
  OpenGL 3.2: #version 150

  OpenGLES 2.0: #version 100
  OpenGLES 3.0: #version 300 es

So we need to check the version of the GdkGLContext if we want use the
appropriate version, especially for legacy OpenGL contexts, which can be
both 3.x and 2.x.

diff --git a/gsk/gskglrenderer.c b/gsk/gskglrenderer.c
index c4eec609d34f0d2e850524d03c282dc8f7eebaa4..0808caab6750f950f3e84b4582148e9f8a17d076 100644 (file)
--- a/gsk/gskglrenderer.c
+++ b/gsk/gskglrenderer.c
@@ -16,8 +16,9 @@
 
 #include <epoxy/gl.h>
 
-#define SHADER_VERSION_GLES             110
-#define SHADER_VERSION_GL_LEGACY        120
+#define SHADER_VERSION_GLES             100
+#define SHADER_VERSION_GL2_LEGACY       110
+#define SHADER_VERSION_GL3_LEGACY       130
 #define SHADER_VERSION_GL3              150
 
 typedef struct {
@@ -213,7 +214,14 @@ gsk_gl_renderer_create_programs (GskGLRenderer *self)
     }
   else if (gdk_gl_context_is_legacy (self->gl_context))
     {
-      gsk_shader_builder_set_version (builder, SHADER_VERSION_GL_LEGACY);
+      int maj, min;
+      gdk_gl_context_get_version (self->gl_context, &maj, &min);
+
+      if (maj == 3)
+        gsk_shader_builder_set_version (builder, SHADER_VERSION_GL3_LEGACY);
+      else
+        gsk_shader_builder_set_version (builder, SHADER_VERSION_GL2_LEGACY);
+
       gsk_shader_builder_set_vertex_preamble (builder, "gl_common.vs.glsl");
       gsk_shader_builder_set_fragment_preamble (builder, "gl_common.fs.glsl");
       gsk_shader_builder_add_define (builder, "GSK_LEGACY", "1");