glslang preprocessing: Add -E option to print out preprocessed GLSL, and do the work needed to generate a preprocessed stream. From Andrew Woloszyn <awoloszyn@google.com>.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@31508 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/baseResults/preprocessor.edge_cases.vert.out

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+#version 310 es
+
+
+
+
+
+
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+void main(){
+  gl_Position = vec4(3 + 2 + 2 * 4 + 2 + 3 * 2);
+}
+
+
+

Test/baseResults/preprocessor.errors.vert.out

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+#version 310 es
+
+
+
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+
+
+
+#error This should show up in pp output . 
+
+
+
+
+int main(){
+}
+
+
+

Test/baseResults/preprocessor.extensions.vert.out

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+#version 310 es
+
+#extension GL_OES_texture_3D : enable
+#extension GL_EXT_frag_depth : disable
+#extension GL_EXT_gpu_shader5 : require
+#extension GL_EXT_shader_texture_image_samples : warn
+
+#extension unknown_extension : require
+
+int main(){
+}
+
+
+

Test/baseResults/preprocessor.function_macro.vert.out

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+#version 310 es
+
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+int main(){
+  gl_Position = vec4(3 + 1, 3 + 4, 3 + 1);
+  gl_Position = vec4(1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12);
+  gl_Position = vec4(4 + 3 + 3);
+}
+
+
+

Test/baseResults/preprocessor.line.vert.out

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+#line 300
+
+#line 2
+
+#line 10
+
+#line 2
+
+#line 0
+
+#line 4
+
+#line 8
+
+void main(){
+  gl_Position = vec4(10);
+}
+#line 8 4
+
+#line 12 3
+
+#line 1
+
+
+
+

Test/baseResults/preprocessor.pragma.vert.out

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+#version 310 es
+
+#pragma optimize(on)
+#pragma optimize(off)
+#pragma debug(on)
+#pragma debug(off)
+
+#pragma undefined_pragma(x,4)
+
+int main(){
+}
+
+
+

Test/baseResults/preprocessor.simple.vert.out

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+#version 310 es
+
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+             float fn(float x){ return x + 4.0;}
+
+int main(){
+  gl_Position = vec4(1);
+  gl_Position = clamp(1, 2, 3);
+  gl_Position = vec4(1);
+  gl_Position = vec4(1, 2);
+  gl_Position = vec4(fn(3));
+}
+
+
+