From 9b4518afdef9240b40c293834fab99b312d41d57 Mon Sep 17 00:00:00 2001
From: Derek Sollenberger <djsollen@google.com>
Date: Mon, 31 Jan 2011 16:27:02 -0500
Subject: Add new vertex shader to support video transforms.

bug: 3072603
Change-Id: I59e52cc9672c653760351b835c63d0496e6ff6ff
---
 WebCore/platform/graphics/android/MediaTexture.cpp  |  7 ++++++-
 WebCore/platform/graphics/android/ShaderProgram.cpp | 17 +++++++++++++++--
 WebCore/platform/graphics/android/ShaderProgram.h   |  3 ++-
 3 files changed, 23 insertions(+), 4 deletions(-)

(limited to 'WebCore/platform')

diff --git a/WebCore/platform/graphics/android/MediaTexture.cpp b/WebCore/platform/graphics/android/MediaTexture.cpp
index cf6f5b3..8481a20 100644
--- a/WebCore/platform/graphics/android/MediaTexture.cpp
+++ b/WebCore/platform/graphics/android/MediaTexture.cpp
@@ -86,7 +86,12 @@ void VideoTexture::drawVideo(const TransformationMatrix& matrix)
         return;
 
     m_surfaceTexture->updateTexImage();
-    TilesManager::instance()->shader()->drawVideoLayerQuad(matrix, m_dimensions, m_textureId);
+
+    float surfaceMatrix[16];
+    m_surfaceTexture->getTransformMatrix(surfaceMatrix);
+
+    TilesManager::instance()->shader()->drawVideoLayerQuad(matrix, surfaceMatrix,
+            m_dimensions, m_textureId);
 }
 
 ANativeWindow* VideoTexture::requestNewWindow()
diff --git a/WebCore/platform/graphics/android/ShaderProgram.cpp b/WebCore/platform/graphics/android/ShaderProgram.cpp
index 0237f03..8da6855 100644
--- a/WebCore/platform/graphics/android/ShaderProgram.cpp
+++ b/WebCore/platform/graphics/android/ShaderProgram.cpp
@@ -59,6 +59,16 @@ static const char gFragmentShader[] =
     "  gl_FragColor *= alpha; "
     "}\n";
 
+static const char gVideoVertexShader[] =
+    "attribute vec4 vPosition;\n"
+    "uniform mat4 textureMatrix;\n"
+    "uniform mat4 projectionMatrix;\n"
+    "varying vec2 v_texCoord;\n"
+    "void main() {\n"
+    "  gl_Position = projectionMatrix * vPosition;\n"
+    "  v_texCoord = vec2(textureMatrix * vec4(vPosition.x, 1.0 - vPosition.y, 0.0, 1.0));\n"
+    "}\n";
+
 static const char gVideoFragmentShader[] =
     "#extension GL_OES_EGL_image_external : require\n"
     "precision mediump float;\n"
@@ -145,13 +155,14 @@ ShaderProgram::ShaderProgram()
 void ShaderProgram::init()
 {
     m_program = createProgram(gVertexShader, gFragmentShader);
-    m_videoProgram = createProgram(gVertexShader, gVideoFragmentShader);
+    m_videoProgram = createProgram(gVideoVertexShader, gVideoFragmentShader);
 
     m_hProjectionMatrix = glGetUniformLocation(m_program, "projectionMatrix");
     m_hAlpha = glGetUniformLocation(m_program, "alpha");
     m_hTexSampler = glGetUniformLocation(m_program, "s_texture");
 
     m_hVideoProjectionMatrix = glGetUniformLocation(m_videoProgram, "projectionMatrix");
+    m_hVideoTextureMatrix = glGetUniformLocation(m_videoProgram, "textureMatrix");
     m_hVideoTexSampler = glGetUniformLocation(m_videoProgram, "s_yuvTexture");
 
     const GLfloat coord[] = {
@@ -288,7 +299,8 @@ void ShaderProgram::drawLayerQuad(const TransformationMatrix& drawMatrix,
 }
 
 void ShaderProgram::drawVideoLayerQuad(const TransformationMatrix& drawMatrix,
-                                       SkRect& geometry, int textureId)
+                                       float* textureMatrix, SkRect& geometry,
+                                       int textureId)
 {
     // switch to our custom yuv video rendering program
     glUseProgram(m_videoProgram);
@@ -301,6 +313,7 @@ void ShaderProgram::drawVideoLayerQuad(const TransformationMatrix& drawMatrix,
     GLfloat projectionMatrix[16];
     GLUtils::toGLMatrix(projectionMatrix, renderMatrix);
     glUniformMatrix4fv(m_hVideoProjectionMatrix, 1, GL_FALSE, projectionMatrix);
+    glUniformMatrix4fv(m_hVideoTextureMatrix, 1, GL_FALSE, textureMatrix);
 
     glBindTexture(GL_TEXTURE_EXTERNAL_OES, textureId);
 
diff --git a/WebCore/platform/graphics/android/ShaderProgram.h b/WebCore/platform/graphics/android/ShaderProgram.h
index fcb093b..1f94290 100644
--- a/WebCore/platform/graphics/android/ShaderProgram.h
+++ b/WebCore/platform/graphics/android/ShaderProgram.h
@@ -42,7 +42,7 @@ class ShaderProgram {
     void drawLayerQuad(const TransformationMatrix& drawMatrix,
                      SkRect& geometry, int textureId, float opacity);
     void drawVideoLayerQuad(const TransformationMatrix& drawMatrix,
-                     SkRect& geometry, int textureId);
+                     float* textureMatrix, SkRect& geometry, int textureId);
     void setViewRect(const IntRect& viewRect);
     FloatRect clipRectInScreenCoord(const TransformationMatrix& drawMatrix,
                                     const IntSize& size);
@@ -70,6 +70,7 @@ class ShaderProgram {
     int m_hAlpha;
     int m_hTexSampler;
     int m_hVideoProjectionMatrix;
+    int m_hVideoTextureMatrix;
     int m_hVideoTexSampler;
 };
 
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