commit 1bf18ce9e2caca7067b4439373f4fb04a5cd7d21
author Austin Eng <enga@chromium.org> Fri Oct 19 15:34:02 2018 -0700
committer Commit Bot <commit-bot@chromium.org> Tue Nov 06 18:04:07 2018 +0000
tree 0fad52812e82d9b6a48c5699caeaa513594395ac
parent bc5834cdadbd5c278c57024c15bbf70d9a224262

Implement GL_ANGLE_multi_draw

This patch adds entrypoints glMultiDrawArraysANGLE,
glMultiDrawElementsANGLE, glMultiDrawArraysInstancedANGLE,
annd glMultiDrawElementsInstancedANGLE

Bug: chromium:890539

Change-Id: Ic9c374c53892460f44ca6e73a253b78473ac2dff
Reviewed-on: https://chromium-review.googlesource.com/c/1282268
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/libANGLE/Program.cpp

diff --git a/src/libANGLE/Program.cpp b/src/libANGLE/Program.cpp
index 4e7af6a..51dd917 100644
--- a/src/libANGLE/Program.cpp
+++ b/src/libANGLE/Program.cpp
@@ -802,6 +802,7 @@
       mGeometryShaderOutputPrimitiveType(PrimitiveMode::TriangleStrip),
       mGeometryShaderInvocations(1),
       mGeometryShaderMaxVertices(0),
+      mDrawIDLocation(-1),
       mActiveSamplerRefCounts{}
 {
     mComputeShaderLocalSize.fill(1);
@@ -1314,6 +1315,11 @@
 
     setUniformValuesFromBindingQualifiers();
 
+    if (context->getExtensions().multiDraw)
+    {
+        mState.mDrawIDLocation = getUniformLocation("gl_DrawID");
+    }
+
     // Save to the program cache.
     auto *cache = linkingState->context->getMemoryProgramCache();
     if (cache &&
@@ -1419,6 +1425,7 @@
     mState.mGeometryShaderOutputPrimitiveType = PrimitiveMode::TriangleStrip;
     mState.mGeometryShaderInvocations         = 1;
     mState.mGeometryShaderMaxVertices         = 0;
+    mState.mDrawIDLocation                    = -1;
 
     mValidated = false;
 
@@ -2682,6 +2689,19 @@
     return mState.mLinkedTransformFeedbackVaryings[index];
 }
 
+bool Program::hasDrawIDUniform() const
+{
+    ASSERT(mLinkResolved);
+    return mState.mDrawIDLocation >= 0;
+}
+
+void Program::setDrawIDUniform(GLint drawid)
+{
+    ASSERT(mLinkResolved);
+    ASSERT(mState.mDrawIDLocation >= 0);
+    mProgram->setUniform1iv(mState.mDrawIDLocation, 1, &drawid);
+}
+
 bool Program::linkVaryings(InfoLog &infoLog) const
 {
     Shader *previousShader = nullptr;