Index: ps/trunk/source/ps/GameSetup/GameSetup.cpp
===================================================================
--- ps/trunk/source/ps/GameSetup/GameSetup.cpp
+++ ps/trunk/source/ps/GameSetup/GameSetup.cpp
@@ -934,9 +934,10 @@
 	// (must come after SetVideoMode, since it calls ogl_Init)
 	CStr8 renderPath = "default";
 	CFG_GET_VAL("renderpath", renderPath);
-	if ((ogl_HaveExtensions(0, "GL_ARB_vertex_program", "GL_ARB_fragment_program", NULL) != 0 // ARB
-		&& ogl_HaveExtensions(0, "GL_ARB_vertex_shader", "GL_ARB_fragment_shader", NULL) != 0) // GLSL
+	if ((ogl_HaveExtensions(0, "GL_ARB_vertex_program", "GL_ARB_fragment_program", nullptr) // ARB
+		&& ogl_HaveExtensions(0, "GL_ARB_vertex_shader", "GL_ARB_fragment_shader", nullptr)) // GLSL
 		|| !ogl_HaveExtension("GL_ARB_vertex_buffer_object") // VBO
+		|| ogl_HaveExtensions(0, "GL_ARB_multitexture", "GL_EXT_draw_range_elements", nullptr)
 		|| (!ogl_HaveExtension("GL_EXT_framebuffer_object") && !ogl_HaveExtension("GL_ARB_framebuffer_object"))
 		|| RenderPathEnum::FromString(renderPath) == FIXED)
 	{
@@ -950,34 +951,6 @@
 		);
 	}
 
-	const char* missing = ogl_HaveExtensions(0,
-		"GL_ARB_multitexture",
-		"GL_EXT_draw_range_elements",
-		"GL_ARB_texture_env_combine",
-		"GL_ARB_texture_env_dot3",
-		NULL);
-	if(missing)
-	{
-		wchar_t buf[500];
-		swprintf_s(buf, ARRAY_SIZE(buf),
-			L"The %hs extension doesn't appear to be available on your computer."
-			L" The game may still work, though - you are welcome to try at your own risk."
-			L" If not or it doesn't look right, upgrade your graphics card.",
-			missing
-		);
-		DEBUG_DISPLAY_ERROR(buf);
-		// TODO: i18n
-	}
-
-	if (!ogl_HaveExtension("GL_ARB_texture_env_crossbar"))
-	{
-		DEBUG_DISPLAY_ERROR(
-			L"The GL_ARB_texture_env_crossbar extension doesn't appear to be available on your computer."
-			L" Shadows are not available and overall graphics quality might suffer."
-			L" You are advised to try installing newer drivers and/or upgrade your graphics card.");
-		g_ConfigDB.SetValueBool(CFG_HWDETECT, "shadows", false);
-	}
-
 	ogl_WarnIfError();
 
 	g_RenderingOptions.ReadConfigAndSetupHooks();
Index: ps/trunk/source/renderer/Renderer.cpp
===================================================================
--- ps/trunk/source/renderer/Renderer.cpp
+++ ps/trunk/source/renderer/Renderer.cpp
@@ -1132,13 +1132,6 @@
 	// inverted depth test so any behind an occluder will get drawn in a constant
 	// color.
 
-	float silhouetteAlpha = 0.75f;
-
-	// Silhouette blending requires an almost-universally-supported extension;
-	// fall back to non-blended if unavailable
-	if (!ogl_HaveExtension("GL_EXT_blend_color"))
-		silhouetteAlpha = 1.f;
-
 	glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 
 	glColorMask(0, 0, 0, 0);
@@ -1169,27 +1162,16 @@
 	glDepthFunc(GL_GEQUAL);
 	glColorMask(1, 1, 1, 1);
 
-	// Render more efficiently if alpha == 1
-	if (silhouetteAlpha == 1.f)
-	{
-		// Ideally we'd render objects back-to-front so nearer silhouettes would
-		// appear on top, but sorting has non-zero cost. So we'll keep the depth
-		// write enabled, to do the opposite - far objects will consistently appear
-		// on top.
-		glDepthMask(0);
-	}
-	else
-	{
-		// Since we can't sort, we'll use the stencil buffer to ensure we only draw
-		// a pixel once (using the color of whatever model happens to be drawn first).
-		glEnable(GL_BLEND);
-		glBlendFunc(GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA);
-		pglBlendColorEXT(0, 0, 0, silhouetteAlpha);
-
-		glEnable(GL_STENCIL_TEST);
-		glStencilFunc(GL_NOTEQUAL, 1, (GLuint)-1);
-		glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
-	}
+	// Since we can't sort, we'll use the stencil buffer to ensure we only draw
+	// a pixel once (using the color of whatever model happens to be drawn first).
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA);
+	const float silhouetteAlpha = 0.75f;
+	pglBlendColorEXT(0, 0, 0, silhouetteAlpha);
+
+	glEnable(GL_STENCIL_TEST);
+	glStencilFunc(GL_NOTEQUAL, 1, (GLuint)-1);
+	glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
 
 	{
 		PROFILE("render model casters");
@@ -1203,17 +1185,10 @@
 
 	// Restore state
 	glDepthFunc(GL_LEQUAL);
-	if (silhouetteAlpha == 1.f)
-	{
-		glDepthMask(1);
-	}
-	else
-	{
-		glDisable(GL_BLEND);
-		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-		pglBlendColorEXT(0, 0, 0, 0);
-		glDisable(GL_STENCIL_TEST);
-	}
+	glDisable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	pglBlendColorEXT(0, 0, 0, 0);
+	glDisable(GL_STENCIL_TEST);
 }
 
 void CRenderer::RenderParticles(int cullGroup)