added gles3 impl

render/gles/shaders/gles3_common.vert

@@ -0,0 +1,12 @@
+#version 300 es
+
+uniform mat3 proj;
+uniform mat3 tex_proj;
+in vec2 pos;
+out vec2 v_texcoord;
+
+void main() {
+	vec3 pos3 = vec3(pos, 1.0);
+	gl_Position = vec4(pos3 * proj, 1.0);
+	v_texcoord = (pos3 * tex_proj).xy;
+}

render/gles/shaders/gles3_quad.frag

@@ -0,0 +1,13 @@
+#version 300 es
+
+precision highp float;
+
+in vec4 v_color;
+in vec2 v_texcoord;
+uniform vec4 color;
+
+out vec4 frag_color;
+
+void main() {
+	frag_color = color;
+}

render/gles/shaders/gles3_tex_external.frag

@@ -0,0 +1,15 @@
+#version 300 es
+
+#extension GL_OES_EGL_image_external_essl3 : require
+
+precision highp float;
+
+in vec2 v_texcoord;
+uniform samplerExternalOES texture0;
+uniform float alpha;
+
+out vec4 frag_color;
+
+void main() {
+	frag_color = texture(texture0, v_texcoord) * alpha;
+}

render/gles/shaders/gles3_tex_rgba.frag

@@ -0,0 +1,13 @@
+#version 300 es
+
+precision highp float;
+
+in vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float alpha;
+
+out vec4 frag_color;
+
+void main() {
+	frag_color = texture(tex, v_texcoord) * alpha;
+}

render/gles/shaders/gles3_tex_rgbx.frag

@@ -0,0 +1,13 @@
+#version 300 es
+
+precision highp float;
+
+in vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float alpha;
+
+out vec4 frag_color;
+
+void main() {
+	frag_color = vec4(texture(tex, v_texcoord).rgb, 1.0) * alpha;
+}

render/gles/shaders/meson.build

@@ -6,6 +6,11 @@ shaders = [
 	'gles2_tex_rgba.frag',
 	'gles2_tex_rgbx.frag',
 	'gles2_tex_external.frag',
+	'gles3_common.vert',
+	'gles3_quad.frag',
+	'gles3_tex_rgba.frag',
+	'gles3_tex_rgbx.frag',
+	'gles3_tex_external.frag',
 ]
 
 foreach name : shaders