1 files changed, 24 insertions, 11 deletions

diff --git a/libs/hwui/Program.cpp b/libs/hwui/Program.cpp
index 14a23765b301..c127d684be32 100644
--- a/libs/hwui/Program.cpp
+++ b/libs/hwui/Program.cpp
@@ -15,6 +15,9 @@
  */
 
 #define LOG_TAG "OpenGLRenderer"
+#define ATRACE_TAG ATRACE_TAG_VIEW
+
+#include <utils/Trace.h>
 
 #include "Program.h"
 
@@ -25,7 +28,6 @@ namespace uirenderer {
 // Base program
 ///////////////////////////////////////////////////////////////////////////////
 
-// TODO: Program instance should be created from a factory method
 Program::Program(const ProgramDescription& description, const char* vertex, const char* fragment) {
     mInitialized = false;
     mHasColorUniform = false;
@@ -50,7 +52,9 @@ Program::Program(const ProgramDescription& description, const char* vertex, cons
                 texCoords = -1;
             }
 
+            ATRACE_BEGIN("linkProgram");
             glLinkProgram(mProgramId);
+            ATRACE_END();
 
             GLint status;
             glGetProgramiv(mProgramId, GL_LINK_STATUS, &status);
@@ -87,6 +91,9 @@ Program::Program(const ProgramDescription& description, const char* vertex, cons
 
 Program::~Program() {
     if (mInitialized) {
+        // This would ideally happen after linking the program
+        // but Tegra drivers, especially when perfhud is enabled,
+        // sometimes crash if we do so
         glDetachShader(mProgramId, mVertexShader);
         glDetachShader(mProgramId, mFragmentShader);
 
@@ -132,6 +139,8 @@ int Program::getUniform(const char* name) {
 }
 
 GLuint Program::buildShader(const char* source, GLenum type) {
+    ATRACE_CALL();
+
     GLuint shader = glCreateShader(type);
     glShaderSource(shader, 1, &source, 0);
     glCompileShader(shader);
@@ -153,20 +162,24 @@ GLuint Program::buildShader(const char* source, GLenum type) {
 
 void Program::set(const mat4& projectionMatrix, const mat4& modelViewMatrix,
         const mat4& transformMatrix, bool offset) {
-    mat4 p(projectionMatrix);
-    if (offset) {
-        // offset screenspace xy by an amount that compensates for typical precision
-        // issues in GPU hardware that tends to paint hor/vert lines in pixels shifted
-        // up and to the left.
-        // This offset value is based on an assumption that some hardware may use as
-        // little as 12.4 precision, so we offset by slightly more than 1/16.
-        p.translate(.065, .065, 0);
+    if (projectionMatrix != mProjection) {
+        if (CC_LIKELY(!offset)) {
+            glUniformMatrix4fv(projection, 1, GL_FALSE, &projectionMatrix.data[0]);
+        } else {
+            mat4 p(projectionMatrix);
+            // offset screenspace xy by an amount that compensates for typical precision
+            // issues in GPU hardware that tends to paint hor/vert lines in pixels shifted
+            // up and to the left.
+            // This offset value is based on an assumption that some hardware may use as
+            // little as 12.4 precision, so we offset by slightly more than 1/16.
+            p.translate(.065, .065, 0);
+            glUniformMatrix4fv(projection, 1, GL_FALSE, &p.data[0]);
+        }
+        mProjection = projectionMatrix;
     }
 
     mat4 t(transformMatrix);
     t.multiply(modelViewMatrix);
-
-    glUniformMatrix4fv(projection, 1, GL_FALSE, &p.data[0]);
     glUniformMatrix4fv(transform, 1, GL_FALSE, &t.data[0]);
 }