Remove obsolete GLES3 backend

Due to the port to Vulkan and complete redesign of the rendering backend,
the `drivers/gles3` code is no longer usable in this state and is not
planned to be ported to the new architecture.

The GLES2 backend is kept (while still disabled and non-working) as it
will eventually be ported to serve as the low-end renderer for Godot 4.0.

Some GLES3 features might be selectively ported to the updated GLES2
backend if there's a need for them, and extensions we can use for that.

So long, OpenGL driver bugs!

2 files changed, 1 insertions, 111 deletions

diff --git a/drivers/gles2/rasterizer_scene_gles2.h b/drivers/gles2/rasterizer_scene_gles2.h
index 65e84a1fbe..174cdd8e2e 100644
--- a/drivers/gles2/rasterizer_scene_gles2.h
+++ b/drivers/gles2/rasterizer_scene_gles2.h
@@ -38,19 +38,6 @@
 #include "shaders/effect_blur.glsl.gen.h"
 #include "shaders/scene.glsl.gen.h"
 #include "shaders/tonemap.glsl.gen.h"
-/*
-
-
-#include "drivers/gles3/shaders/exposure.glsl.gen.h"
-#include "drivers/gles3/shaders/resolve.glsl.gen.h"
-#include "drivers/gles3/shaders/scene.glsl.gen.h"
-#include "drivers/gles3/shaders/screen_space_reflection.glsl.gen.h"
-#include "drivers/gles3/shaders/ssao.glsl.gen.h"
-#include "drivers/gles3/shaders/ssao_blur.glsl.gen.h"
-#include "drivers/gles3/shaders/ssao_minify.glsl.gen.h"
-#include "drivers/gles3/shaders/subsurf_scattering.glsl.gen.h"
-
-*/
 
 class RasterizerSceneGLES2 : public RasterizerScene {
 public:
@@ -109,103 +96,6 @@ public:
 		Color default_ambient;
 		Color default_bg;
 
-		// ResolveShaderGLES3 resolve_shader;
-		// ScreenSpaceReflectionShaderGLES3 ssr_shader;
-		// EffectBlurShaderGLES3 effect_blur_shader;
-		// SubsurfScatteringShaderGLES3 sss_shader;
-		// SsaoMinifyShaderGLES3 ssao_minify_shader;
-		// SsaoShaderGLES3 ssao_shader;
-		// SsaoBlurShaderGLES3 ssao_blur_shader;
-		// ExposureShaderGLES3 exposure_shader;
-
-		/*
-		struct SceneDataUBO {
-			//this is a std140 compatible struct. Please read the OpenGL 3.3 Specificaiton spec before doing any changes
-			float projection_matrix[16];
-			float inv_projection_matrix[16];
-			float camera_inverse_matrix[16];
-			float camera_matrix[16];
-			float ambient_light_color[4];
-			float bg_color[4];
-			float fog_color_enabled[4];
-			float fog_sun_color_amount[4];
-
-			float ambient_energy;
-			float bg_energy;
-			float z_offset;
-			float z_slope_scale;
-			float shadow_dual_paraboloid_render_zfar;
-			float shadow_dual_paraboloid_render_side;
-			float viewport_size[2];
-			float screen_pixel_size[2];
-			float shadow_atlas_pixel_size[2];
-			float shadow_directional_pixel_size[2];
-
-			float time;
-			float z_far;
-			float reflection_multiplier;
-			float subsurface_scatter_width;
-			float ambient_occlusion_affect_light;
-
-			uint32_t fog_depth_enabled;
-			float fog_depth_begin;
-			float fog_depth_curve;
-			uint32_t fog_transmit_enabled;
-			float fog_transmit_curve;
-			uint32_t fog_height_enabled;
-			float fog_height_min;
-			float fog_height_max;
-			float fog_height_curve;
-			// make sure this struct is padded to be a multiple of 16 bytes for webgl
-
-		} ubo_data;
-
-		GLuint scene_ubo;
-
-		struct EnvironmentRadianceUBO {
-
-			float transform[16];
-			float ambient_contribution;
-			uint8_t padding[12];
-
-		} env_radiance_data;
-
-		GLuint env_radiance_ubo;
-
-		GLuint sky_array;
-
-		GLuint directional_ubo;
-
-		GLuint spot_array_ubo;
-		GLuint omni_array_ubo;
-		GLuint reflection_array_ubo;
-
-		GLuint immediate_buffer;
-		GLuint immediate_array;
-
-		uint32_t ubo_light_size;
-		uint8_t *spot_array_tmp;
-		uint8_t *omni_array_tmp;
-		uint8_t *reflection_array_tmp;
-
-		int max_ubo_lights;
-		int max_forward_lights_per_object;
-		int max_ubo_reflections;
-		int max_skeleton_bones;
-
-		bool used_contact_shadows;
-
-		int spot_light_count;
-		int omni_light_count;
-		int directional_light_count;
-		int reflection_probe_count;
-
-		bool used_sss;
-		bool using_contact_shadows;
-
-		VS::ViewportDebugDraw debug_draw;
-		*/
-
 		bool cull_front;
 		bool cull_disabled;
 
diff --git a/drivers/gles2/shader_compiler_gles2.h b/drivers/gles2/shader_compiler_gles2.h
index 15cfac9f03..e39ef5e7bd 100644
--- a/drivers/gles2/shader_compiler_gles2.h
+++ b/drivers/gles2/shader_compiler_gles2.h
@@ -99,4 +99,4 @@ public:
 	ShaderCompilerGLES2();
 };
 
-#endif // SHADERCOMPILERGLES3_H
+#endif // SHADERCOMPILERGLES2_H