gl-renderer: allow importing fourth dmabuf plane

EGL_EXT_image_dma_buf_import_modifiers supports importing upto four dmabuf
planes into an EGLImage.

v2: correct PLANE3_PITCH token (Daniel Stone)

Signed-off-by: Varad Gautam <varad.gautam@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/shared/weston-egl-ext.h b/shared/weston-egl-ext.h
index 05eca31..ffea438 100644
--- a/shared/weston-egl-ext.h
+++ b/shared/weston-egl-ext.h
@@ -128,12 +128,17 @@
 /* Define tokens from EGL_EXT_image_dma_buf_import_modifiers */
 #ifndef EGL_EXT_image_dma_buf_import_modifiers
 #define EGL_EXT_image_dma_buf_import_modifiers 1
+#define EGL_DMA_BUF_PLANE3_FD_EXT         0x3440
+#define EGL_DMA_BUF_PLANE3_OFFSET_EXT     0x3441
+#define EGL_DMA_BUF_PLANE3_PITCH_EXT      0x3442
 #define EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT 0x3443
 #define EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT 0x3444
 #define EGL_DMA_BUF_PLANE1_MODIFIER_LO_EXT 0x3445
 #define EGL_DMA_BUF_PLANE1_MODIFIER_HI_EXT 0x3446
 #define EGL_DMA_BUF_PLANE2_MODIFIER_LO_EXT 0x3447
 #define EGL_DMA_BUF_PLANE2_MODIFIER_HI_EXT 0x3448
+#define EGL_DMA_BUF_PLANE3_MODIFIER_LO_EXT 0x3449
+#define EGL_DMA_BUF_PLANE3_MODIFIER_HI_EXT 0x344A
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYDMABUFFORMATSEXTPROC) (EGLDisplay dpy, EGLint max_formats, EGLint *formats, EGLint *num_formats);
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYDMABUFMODIFIERSEXTPROC) (EGLDisplay dpy, EGLint format, EGLint max_modifiers, EGLuint64KHR *modifiers, EGLBoolean *external_only, EGLint *num_modifiers);
 #endif