Fix OpenGL ES depth&stencil format querying.

src/renderer_gl.cpp

@@ -1813,6 +1813,16 @@ namespace bgfx { namespace gl
 			m_version     = getGLString(GL_VERSION);
 			m_glslVersion = getGLString(GL_SHADING_LANGUAGE_VERSION);
 
+			int glVersion;
+			int majorGlVersion = 0;
+			int minorGlVersion = 0;
+			const char *version = m_version;
+			while(*version && (*version < '0' || *version > '9'))
+				++version;
+			majorGlVersion = atoi(version);
+			minorGlVersion = atoi(version + 2);
+			glVersion = majorGlVersion*10 + minorGlVersion;
+
 			for (uint32_t ii = 0; ii < BX_COUNTOF(s_vendorIds); ++ii)
 			{
 				const VendorId& vendorId = s_vendorIds[ii];
@@ -2048,8 +2058,6 @@ namespace bgfx { namespace gl
 
 				if (BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES) )
 				{
-					setTextureFormat(TextureFormat::D32, GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT);
-
 					if (BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES < 30) )
 					{
 						setTextureFormat(TextureFormat::RGBA16F, GL_RGBA, GL_RGBA, GL_HALF_FLOAT);
@@ -2083,12 +2091,30 @@ namespace bgfx { namespace gl
 							s_textureFilter[TextureFormat::RG32F]   = linear32F;
 							s_textureFilter[TextureFormat::RGBA32F] = linear32F;
 						}
+					}
 
-						if (BX_ENABLED(BX_PLATFORM_EMSCRIPTEN))
-						{
-							setTextureFormat(TextureFormat::D16,   GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT);
-							setTextureFormat(TextureFormat::D24S8, GL_DEPTH_STENCIL,   GL_DEPTH_STENCIL,   GL_UNSIGNED_INT_24_8);
-						}
+					if (BX_ENABLED(BX_PLATFORM_EMSCRIPTEN)
+						&& (s_extension[Extension::WEBGL_depth_texture].m_supported
+						|| s_extension[Extension::MOZ_WEBGL_depth_texture].m_supported
+						|| s_extension[Extension::WEBKIT_WEBGL_depth_texture].m_supported))
+					{
+						setTextureFormat(TextureFormat::D16,   GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT);
+						setTextureFormat(TextureFormat::D24,   GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT); // N.b. OpenGL ES does not guarantee that there are 24 bits available here, could be 16. See https://www.khronos.org/registry/webgl/extensions/WEBGL_depth_texture/
+						setTextureFormat(TextureFormat::D32,   GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT); // N.b. same as above.
+						setTextureFormat(TextureFormat::D24S8, GL_DEPTH_STENCIL,   GL_DEPTH_STENCIL,   GL_UNSIGNED_INT_24_8);
+					}
+
+					// OpenGL ES 3.0 depth formats.
+					if (glVersion >= 30)
+					{
+						setTextureFormat(TextureFormat::D16,   GL_DEPTH_COMPONENT16,  GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT);
+						setTextureFormat(TextureFormat::D24,   GL_DEPTH_COMPONENT24,  GL_DEPTH_COMPONENT, GL_UNSIGNED_INT);
+						setTextureFormat(TextureFormat::D32,   GL_DEPTH_COMPONENT24,  GL_DEPTH_COMPONENT, GL_UNSIGNED_INT);
+						setTextureFormat(TextureFormat::D24S8, GL_DEPTH24_STENCIL8,   GL_DEPTH_STENCIL,   GL_UNSIGNED_INT_24_8);
+						setTextureFormat(TextureFormat::D16F,  GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT, GL_FLOAT); // GLES 3.0 does not have D16F, overshoot to D32F
+						setTextureFormat(TextureFormat::D24F,  GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT, GL_FLOAT); // GLES 3.0 does not have D24F, overshoot to D32F
+						setTextureFormat(TextureFormat::D32F,  GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT, GL_FLOAT);
+						setTextureFormat(TextureFormat::D0S8,  GL_STENCIL_INDEX8, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE); // Only works as renderbuffer, not as texture
 					}
 				}