Codechange: [OpenGL] Use shaders to display the video buffer on screen.

src/table/opengl_shader.h

@@ -0,0 +1,28 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file opengl_shader.h OpenGL shader programs. */
+
+/** Vertex shader that just passes colour and tex coords through. */
+static const char *_vertex_shader_direct[] = {
+	"#version 110\n",
+	"void main() {",
+	"  gl_TexCoord[0] = gl_MultiTexCoord0;",
+	"  gl_Position = gl_Vertex;",
+	"}",
+};
+
+/** Fragment shader that reads the fragment colour from a 32bpp texture. */
+static const char *_frag_shader_direct[] = {
+	"#version 110\n",
+	"uniform sampler2D colour_tex;",
+	"void main() {",
+	"  gl_FragColor = texture2D(colour_tex, gl_TexCoord[0].st);",
+	"}",
+};