commit 09b04a2ffc64133ed0b19070092afd2d07d2ae2b
author Olli Etuaho <oetuaho@nvidia.com> Thu Dec 15 13:30:26 2016 +0000
committer Commit Bot <commit-bot@chromium.org> Thu Dec 22 12:10:08 2016 +0000
tree 8f959815cb6a96569ba089206cb2123b3afd73c0
parent b58e9bace69fe3752ff6439f01ce6185e7f04e21

Add shader translator support for OVR_multiview

The OVR_multiview and OVR_multiview2 extensions add gl_ViewID_OVR to
shaders. gl_ViewID_OVR can be translated either as is in GLSL output
or as a uniform by setting the SH_TRANSLATE_VIEWID_OVR_AS_UNIFORM
compiler flag.

If WebGL output is selected, the shaders will be validated according
to proposed rules in the WEBGL_multiview spec.

BUG=angleproject:1669
TEST=angle_unittests

Change-Id: I19ea3a6c8b4edb78be03f1a50a96bfef018870d0
Reviewed-on: https://chromium-review.googlesource.com/422848
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>

src/compiler/translator/ShaderLang.cpp

diff --git a/src/compiler/translator/ShaderLang.cpp b/src/compiler/translator/ShaderLang.cpp
index 9276233..da121e8 100644
--- a/src/compiler/translator/ShaderLang.cpp
+++ b/src/compiler/translator/ShaderLang.cpp
@@ -161,6 +161,7 @@
     resources->EXT_shader_framebuffer_fetch    = 0;
     resources->NV_shader_framebuffer_fetch     = 0;
     resources->ARM_shader_framebuffer_fetch    = 0;
+    resources->OVR_multiview                   = 0;
 
     resources->NV_draw_buffers = 0;
 
@@ -176,6 +177,8 @@
     // Extensions constants.
     resources->MaxDualSourceDrawBuffers = 0;
 
+    resources->MaxViewsOVR = 2;
+
     // Disable name hashing by default.
     resources->HashFunction = NULL;
 
@@ -371,6 +374,16 @@
     return compiler->getComputeShaderLocalSize();
 }
 
+int ShGetVertexShaderNumViews(const ShHandle handle)
+{
+    ASSERT(handle);
+    TShHandleBase *base = static_cast<TShHandleBase *>(handle);
+    TCompiler *compiler = base->getAsCompiler();
+    ASSERT(compiler);
+
+    return compiler->getNumViews();
+}
+
 bool ShCheckVariablesWithinPackingLimits(int maxVectors,
                                          const std::vector<ShaderVariable> &variables)
 {
@@ -512,6 +525,11 @@
     return ShGetComputeShaderLocalGroupSize(handle);
 }
 
+int GetVertexShaderNumViews(const ShHandle handle)
+{
+    return ShGetVertexShaderNumViews(handle);
+}
+
 bool CheckVariablesWithinPackingLimits(int maxVectors,
                                        const std::vector<sh::ShaderVariable> &variables)
 {