Include glGetMultisamplefv API

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1720963002

Review URL: https://codereview.chromium.org/1720963002

10 files changed, 37 insertions, 0 deletions

diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index 4fb05c14a1..c544d6ef77 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -92,6 +92,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fCompressedTexSubImageSupport = false;
     fOversizedStencilSupport = false;
     fTextureBarrierSupport = false;
+    fSampleLocationsSupport = false;
     fUsesMixedSamples = false;
     fSupportsInstancedDraws = false;
     fFullClearIsFree = false;
@@ -165,6 +166,7 @@ SkString GrCaps::dump() const {
     r.appendf("Compressed Update Support          : %s\n", gNY[fCompressedTexSubImageSupport]);
     r.appendf("Oversized Stencil Support          : %s\n", gNY[fOversizedStencilSupport]);
     r.appendf("Texture Barrier Support            : %s\n", gNY[fTextureBarrierSupport]);
+    r.appendf("Sample Locations Support           : %s\n", gNY[fSampleLocationsSupport]);
     r.appendf("Uses Mixed Samples                 : %s\n", gNY[fUsesMixedSamples]);
     r.appendf("Supports instanced draws           : %s\n", gNY[fSupportsInstancedDraws]);
     r.appendf("Full screen clear is free          : %s\n", gNY[fFullClearIsFree]);
diff --git a/src/gpu/gl/GrGLAssembleInterface.cpp b/src/gpu/gl/GrGLAssembleInterface.cpp
index e52d302190..f23bf17d69 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -162,6 +162,9 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
     GET_PROC(GetBufferParameteriv);
     GET_PROC(GetError);
     GET_PROC(GetIntegerv);
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(GetMultisamplefv);
+    }
     GET_PROC(GetQueryObjectiv);
     GET_PROC(GetQueryObjectuiv);
     if (glVer >= GR_GL_VER(3,3) || extensions.has("GL_ARB_timer_query")) {
@@ -609,6 +612,11 @@ const GrGLInterface* GrGLAssembleGLESInterface(void* ctx, GrGLGetProc get) {
     GET_PROC(GetBufferParameteriv);
     GET_PROC(GetError);
     GET_PROC(GetIntegerv);
+
+    if (version >= GR_GL_VER(3,1)) {
+        GET_PROC(GetMultisamplefv);
+    }
+
     GET_PROC(GetProgramInfoLog);
     GET_PROC(GetProgramiv);
     GET_PROC(GetShaderInfoLog);
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 546b0bf692..883ac15251 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -126,6 +126,13 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         fTextureBarrierSupport = ctxInfo.hasExtension("GL_NV_texture_barrier");
     }
 
+    if (kGL_GrGLStandard == standard) {
+        fSampleLocationsSupport = version >= GR_GL_VER(3,2) ||
+                                  ctxInfo.hasExtension("GL_ARB_texture_multisample");
+    } else {
+        fSampleLocationsSupport = version >= GR_GL_VER(3,1);
+    }
+
     // ARB_texture_rg is part of OpenGL 3.0, but mesa doesn't support GL_RED 
     // and GL_RG on FBO textures.
     if (kMesa_GrGLDriver != ctxInfo.driver()) {
diff --git a/src/gpu/gl/GrGLCreateNullInterface.cpp b/src/gpu/gl/GrGLCreateNullInterface.cpp
index f56b1d9773..17f305b6e3 100644
--- a/src/gpu/gl/GrGLCreateNullInterface.cpp
+++ b/src/gpu/gl/GrGLCreateNullInterface.cpp
@@ -402,6 +402,7 @@ const GrGLInterface* GrGLCreateNullInterface() {
     functions->fGetBufferParameteriv = nullGLGetBufferParameteriv;
     functions->fGetError = noOpGLGetError;
     functions->fGetIntegerv = noOpGLGetIntegerv;
+    functions->fGetMultisamplefv = noOpGLGetMultisamplefv;
     functions->fGetQueryObjecti64v = noOpGLGetQueryObjecti64v;
     functions->fGetQueryObjectiv = noOpGLGetQueryObjectiv;
     functions->fGetQueryObjectui64v = noOpGLGetQueryObjectui64v;
diff --git a/src/gpu/gl/GrGLDefines.h b/src/gpu/gl/GrGLDefines.h
index 9be769fb85..219501c1f8 100644
--- a/src/gpu/gl/GrGLDefines.h
+++ b/src/gpu/gl/GrGLDefines.h
@@ -382,6 +382,7 @@
 
 /* multisample */
 #define GR_GL_MULTISAMPLE                    0x809D
+#define GR_GL_SAMPLE_POSITION                0x8E50
 
 /* Points */
 #define GR_GL_POINT_SMOOTH                   0x0B10
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index c09efae2b8..84c51fb252 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -487,6 +487,14 @@ bool GrGLInterface::validate() const {
     }
 
     if ((kGL_GrGLStandard == fStandard &&
+         (glVer >= GR_GL_VER(3,2) || fExtensions.has("GL_ARB_texture_multisample"))) ||
+        (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
+        if (NULL == fFunctions.fGetMultisamplefv) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
+    if ((kGL_GrGLStandard == fStandard &&
          (glVer >= GR_GL_VER(4,3) || fExtensions.has("GL_ARB_program_interface_query"))) ||
         (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
         if (nullptr == fFunctions.fGetProgramResourceLocation) {
diff --git a/src/gpu/gl/GrGLNoOpInterface.cpp b/src/gpu/gl/GrGLNoOpInterface.cpp
index f08d737d58..3cf9ecd1e2 100644
--- a/src/gpu/gl/GrGLNoOpInterface.cpp
+++ b/src/gpu/gl/GrGLNoOpInterface.cpp
@@ -561,6 +561,12 @@ GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetInfoLog(GrGLuint program,
    }
 }
 
+GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetMultisamplefv(GrGLenum pname,
+                                                    GrGLuint index,
+                                                    GrGLfloat* val) {
+    val[0] = val[1] = 0.5f;
+}
+
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetShaderOrProgramiv(GrGLuint program,
                                                         GrGLenum pname,
                                                         GrGLint* params) {
diff --git a/src/gpu/gl/GrGLNoOpInterface.h b/src/gpu/gl/GrGLNoOpInterface.h
index 44894b763a..23168e28a3 100644
--- a/src/gpu/gl/GrGLNoOpInterface.h
+++ b/src/gpu/gl/GrGLNoOpInterface.h
@@ -363,6 +363,8 @@ GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetInfoLog(GrGLuint program,
                                               GrGLsizei* length,
                                               char* infolog);
 
+GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetMultisamplefv(GrGLenum pname, GrGLuint index, GrGLfloat* val);
+
 // can be used for both the program and shader params
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGetShaderOrProgramiv(GrGLuint program,
                                                         GrGLenum pname,
diff --git a/src/gpu/gl/SkNullGLContext.cpp b/src/gpu/gl/SkNullGLContext.cpp
index 68b19ce990..33f9a0a0a0 100644
--- a/src/gpu/gl/SkNullGLContext.cpp
+++ b/src/gpu/gl/SkNullGLContext.cpp
@@ -451,6 +451,7 @@ static GrGLInterface* create_null_interface(State* state) {
     functions->fGetBufferParameteriv = nullGLGetBufferParameteriv;
     functions->fGetError = noOpGLGetError;
     functions->fGetIntegerv = noOpGLGetIntegerv;
+    functions->fGetMultisamplefv = noOpGLGetMultisamplefv;
     functions->fGetQueryObjecti64v = noOpGLGetQueryObjecti64v;
     functions->fGetQueryObjectiv = noOpGLGetQueryObjectiv;
     functions->fGetQueryObjectui64v = noOpGLGetQueryObjectui64v;
diff --git a/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp b/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
index 2118c02fa7..23e0d7e919 100644
--- a/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
+++ b/src/gpu/gl/debug/GrGLCreateDebugInterface.cpp
@@ -895,6 +895,7 @@ const GrGLInterface* GrGLCreateDebugInterface() {
     functions->fGetBufferParameteriv = debugGLGetBufferParameteriv;
     functions->fGetError = noOpGLGetError;
     functions->fGetIntegerv = noOpGLGetIntegerv;
+    functions->fGetMultisamplefv = noOpGLGetMultisamplefv;
     functions->fGetQueryObjecti64v = noOpGLGetQueryObjecti64v;
     functions->fGetQueryObjectiv = noOpGLGetQueryObjectiv;
     functions->fGetQueryObjectui64v = noOpGLGetQueryObjectui64v;