aha, need 4-byte aligned strides

libcygnet/samples/hello-texture/hello-texture.cc

@@ -30,9 +30,9 @@ int main() {
 	};
 
 	uint8_t image[] = {
-		0xff, 0xff, 0xff,  0xaa, 0xaa, 0xaa,  0xff, 0x00, 0xba,
-		0xaa, 0xaa, 0xaa,  0xff, 0x00, 0x00,  0x00, 0x00, 0xff,
-		0xa0, 0x55, 0x77,  0x00, 0xf0, 0x0f,  0xff, 0x00, 0xff,
+		0xff, 0xff, 0xff,  0xaa, 0xaa, 0xaa,  0xff, 0x00, 0xba,  0, 0, 0,
+		0xaa, 0xaa, 0xaa,  0xff, 0x00, 0x00,  0x00, 0x00, 0xff,  0, 0, 0,
+		0xa0, 0x55, 0x77,  0x00, 0xf0, 0x0f,  0xff, 0x00, 0xff,  0, 0, 0,
 	};
 
 	GLuint texId;
@@ -77,6 +77,11 @@ int main() {
 		glUniform1i(texLoc, 0);
 		Cygnet::glCheck();
 
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, texId);
+		glUniform1i(texLoc, 0);
+		Cygnet::glCheck();
+
 		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indexes);
 		Cygnet::glCheck();