fixes for light2d in androids that do not support

read depth

2 files changed, 35 insertions, 20 deletions

diff --git a/drivers/gles2/rasterizer_gles2.cpp b/drivers/gles2/rasterizer_gles2.cpp
index 05c977f344..d2bf28a1bc 100644
--- a/drivers/gles2/rasterizer_gles2.cpp
+++ b/drivers/gles2/rasterizer_gles2.cpp
@@ -9129,6 +9129,7 @@ void RasterizerGLES2::canvas_render_items(CanvasItem *p_item_list,int p_z,const
 	canvas_shader.set_conditional(CanvasShaderGLES2::USE_MODULATE,canvas_use_modulate);
 	canvas_shader.set_conditional(CanvasShaderGLES2::USE_DISTANCE_FIELD,false);
 
+
 	bool reset_modulate=false;
 	bool prev_distance_field=false;
 
@@ -10578,6 +10579,7 @@ void RasterizerGLES2::init() {
 	shadow_mat_ptr = material_owner.get(shadow_material);
 	overdraw_material = create_overdraw_debug_material();
 	copy_shader.set_conditional(CopyShaderGLES2::USE_8BIT_HDR,!use_fp16_fb);
+	canvas_shader.set_conditional(CanvasShaderGLES2::USE_DEPTH_SHADOWS,read_depth_supported);
 
 	canvas_shader.set_conditional(CanvasShaderGLES2::USE_PIXEL_SNAP,GLOBAL_DEF("rasterizer/use_pixel_snap",false));
 
diff --git a/drivers/gles2/shaders/canvas.glsl b/drivers/gles2/shaders/canvas.glsl
index bd10c49559..afa58b7741 100644
--- a/drivers/gles2/shaders/canvas.glsl
+++ b/drivers/gles2/shaders/canvas.glsl
@@ -299,32 +299,45 @@ LIGHT_SHADER_CODE
 
 		highp float shadow_attenuation;
 
+#ifdef USE_DEPTH_SHADOWS
+
+#define SHADOW_DEPTH(m_tex,m_uv) (texture2D((m_tex),(m_uv)).z)
+
+#else
+
+//#define SHADOW_DEPTH(m_tex,m_uv) dot(texture2D((m_tex),(m_uv)),highp vec4(1.0 / (256.0 * 256.0 * 256.0),1.0 / (256.0 * 256.0),1.0 / 256.0,1)  )
+#define SHADOW_DEPTH(m_tex,m_uv) dot(texture2D((m_tex),(m_uv)),vec4(1.0 / (256.0 * 256.0 * 256.0),1.0 / (256.0 * 256.0),1.0 / 256.0,1)  )
+
+#endif
+
+
+
 #ifdef SHADOW_PCF5
 
 		shadow_attenuation=0.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*2.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*2.0,sh)).z<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*2.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*2.0,sh))<sz?0.0:1.0;
 		shadow_attenuation/=5.0;
 
 #endif
 
 #ifdef SHADOW_PCF13
 
-		shadow_attenuation += texture2D(shadow_texture,vec2(su,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*2.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*3.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*4.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*5.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su+shadowpixel_size*6.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*2.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*3.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*4.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*5.0,sh)).z<sz?0.0:1.0;
-		shadow_attenuation += texture2D(shadow_texture,vec2(su-shadowpixel_size*6.0,sh)).z<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*2.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*3.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*4.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*5.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size*6.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*2.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*3.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*4.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*5.0,sh))<sz?0.0:1.0;
+		shadow_attenuation += SHADOW_DEPTH(shadow_texture,vec2(su-shadowpixel_size*6.0,sh))<sz?0.0:1.0;
 		shadow_attenuation/=13.0;
 
 #endif
@@ -336,8 +349,8 @@ LIGHT_SHADER_CODE
 			float unnormalized = su/shadowpixel_size;
 			float fractional = fract(unnormalized);
 			unnormalized = floor(unnormalized);
-			float zc = texture2D(shadow_texture,vec2((unnormalized-0.5)*shadowpixel_size,sh)).z;
-			float zn = texture2D(shadow_texture,vec2((unnormalized+0.5)*shadowpixel_size,sh)).z;
+			float zc = SHADOW_DEPTH(shadow_texture,vec2((unnormalized-0.5)*shadowpixel_size,sh));
+			float zn = SHADOW_DEPTH(shadow_texture,vec2((unnormalized+0.5)*shadowpixel_size,sh));
 			float z = mix(zc,zn,fractional);
 			shadow_attenuation=clamp(exp(shadow_esm_multiplier* ( z - sz )),0.0,1.0);
 	}
@@ -346,7 +359,7 @@ LIGHT_SHADER_CODE
 
 #if !defined(SHADOW_PCF5) && !defined(SHADOW_PCF13) && !defined(SHADOW_ESM)
 
-		shadow_attenuation = texture2D(shadow_texture,vec2(su+shadowpixel_size,sh)).z<sz?0.0:1.0;
+		shadow_attenuation = SHADOW_DEPTH(shadow_texture,vec2(su+shadowpixel_size,sh))<sz?0.0:1.0;
 
 #endif