renderer: fix gles30/webgl breakage

src/renderer/gl33/texture.c

@@ -593,6 +593,9 @@ bool gl33_texture_sampler_compatible(Texture *tex, UniformType sampler_type) {
 }
 
 bool gl33_texture_dump(Texture *tex, uint mipmap, uint layer, Pixmap *dst) {
+#ifdef STATIC_GLES3
+	UNREACHABLE;
+#else
 	if(tex->fmt_info->flags & GLTEX_COMPRESSED) {
 		// TODO
 		return false;
@@ -617,4 +620,5 @@ bool gl33_texture_dump(Texture *tex, uint mipmap, uint layer, Pixmap *dst) {
 	);
 
 	return true;
+#endif
 }

src/renderer/glcommon/opengl.h

@@ -223,7 +223,7 @@ struct glext_s {
 #undef GLES_ATLEAST
 #define GLES_ATLEAST(mjr, mnr) (glext.version.is_es && GLANY_ATLEAST(mjr, mnr))
 
-#ifdef STATIC_GLESS
+#ifdef STATIC_GLES3
 	#define HAVE_GL_FUNC(func) (&(func) != NULL)
 #else
 	#define HAVE_GL_FUNC(func) ((func) != NULL)

src/renderer/gles20/gles20.c

@@ -59,6 +59,7 @@ RendererBackend _r_backend_gles20 = {
 	.name = "gles20",
 	.funcs = {
 		.init = gles20_init,
+		.texture_dump = gles_texture_dump,
 		.screenshot = gles_screenshot,
 		.index_buffer_create = gles20_index_buffer_create,
 		.index_buffer_get_capacity = gles20_index_buffer_get_capacity,

src/renderer/gles30/gles30.c

@@ -19,6 +19,7 @@ RendererBackend _r_backend_gles30 = {
 	.name = "gles30",
 	.funcs = {
 		.init = gles30_init,
+		.texture_dump = gles_texture_dump,
 		.screenshot = gles_screenshot,
 	},
 	.custom = &(GLBackendData) {

src/renderer/glescommon/gles.c

@@ -59,3 +59,10 @@ bool gles_screenshot(Pixmap *out) {
 	glReadPixels(vp.x, vp.y, vp.w, vp.h, GL_RGBA, GL_UNSIGNED_BYTE, out->data.untyped);
 	return true;
 }
+
+bool gles_texture_dump(Texture *tex, uint mipmap, uint layer, Pixmap *dst) {
+	// No glGetTexImage in GLES
+	// TODO maybe set up a transient framebuffer to read from?
+	log_warn("FIXME: not implemented");
+	return false;
+}

src/renderer/glescommon/gles.h

@@ -16,5 +16,6 @@
 void gles_init(RendererBackend *gles_backend, int major, int minor);
 void gles_init_context(SDL_Window *w);
 bool gles_screenshot(Pixmap *out);
+bool gles_texture_dump(Texture *tex, uint mipmap, uint layer, Pixmap *dst);
 
 #endif // IGUARD_renderer_glescommon_gles_h