Merge pull request #469 from strfry/master

Use GLES2 glTex[Sub]Image2D code paths also for GL2

src/nanovg_gl.h

@@ -754,7 +754,7 @@ static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int im
 	if (type == NVG_TEXTURE_RGBA)
 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
 	else
-#if defined(NANOVG_GLES2)
+#if defined(NANOVG_GLES2) || defined (NANOVG_GL2)
 		glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
 #elif defined(NANOVG_GLES3)
 		glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
@@ -846,7 +846,7 @@ static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w
 	if (tex->type == NVG_TEXTURE_RGBA)
 		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
 	else
-#ifdef NANOVG_GLES2
+#if defined(NANOVG_GLES2) || defined(NANOVG_GL2)
 		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
 #else
 		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data);