content/shell/android/draw_context.cc - Issue 10828356: Very basic Android browser-side compositing support.

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Issue 10828356: Very basic Android browser-side compositing support. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: ifdef Attach/RemoveLayer API Created 8 years, 3 months ago

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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

2 // Use of this source code is governed by a BSD-style license that can be

3 // found in the LICENSE file.

4

5 #include "content/shell/android/draw_context.h"

6

7 #include "base/logging.h"

8 #include "content/public/browser/android/graphics_context.h"

9 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGraphicsC ontext3D.h"

10

11 namespace {

12

13 static const char g_vertex_shader[] =

14 "attribute vec4 a_Position;"

15 "attribute vec2 a_texCoord;"

16 "varying vec2 v_texCoord;"

17 "void main() {"

18 " gl_Position = a_Position;"

19 " v_texCoord = a_texCoord;"

20 "}";

21

22 // Minimal texture mapping pixel shader.

23 static const char g_fragment_shader[] =

24 "precision mediump float;"

25 "varying vec2 v_texCoord;"

26 "uniform sampler2D s_texture;"

27 "void main() {"

28 " gl_FragColor = texture2D(s_texture, v_texCoord);"

29 "}";

30

31 } // anonymous namespace

32

33 namespace content {

34

35 DrawContext::DrawContext(ANativeWindow* window)

36 : program_(GL_ZERO),

37 vertex_shader_(0),

38 fragment_shader_(0),

39 texture_uniform_(GL_ZERO),

40 vertex_buffer_(GL_ZERO),

41 context_(content::GraphicsContext::CreateForUI(window)) {

42 const GLfloat attribs[] = {

43 -1.0f, -1.0f,

44 1.0f, -1.0f,

45 -1.0f, 1.0f,

46 1.0f, 1.0f,

47 0.0f, 0.0f,

48 1.0f, 0.0f,

49 0.0f, 1.0f,

50 1.0f, 1.0f };

51 WebKit::WebGraphicsContext3D* context3D = context_->GetContext3D();

52 vertex_buffer_ = context3D->createBuffer();

53 context3D->bindBuffer(GL_ARRAY_BUFFER, vertex_buffer_);

54 context3D->bufferData(GL_ARRAY_BUFFER, 16 * sizeof(GLfloat), attribs,

55 GL_STATIC_DRAW);

56

57 vertex_shader_ = context3D->createShader(GL_VERTEX_SHADER);

58 context3D->shaderSource(vertex_shader_, g_vertex_shader);

59 context3D->compileShader(vertex_shader_);

60

61 fragment_shader_ = context3D->createShader(GL_FRAGMENT_SHADER);

62 context3D->shaderSource(fragment_shader_, g_fragment_shader);

63 context3D->compileShader(fragment_shader_);

64

65 program_ = context3D->createProgram();

66 context3D->attachShader(program_, vertex_shader_);

67 context3D->attachShader(program_, fragment_shader_);

68 context3D->linkProgram(program_);

69

70 texture_uniform_ = context3D->getUniformLocation(program_, "s_texture");

71 }

72

73 DrawContext::~DrawContext() {

74 if (vertex_buffer_ != GL_ZERO)

75 context_->GetContext3D()->deleteBuffer(vertex_buffer_);

76 if (program_ != GL_ZERO)

77 context_->GetContext3D()->deleteProgram(program_);

78 }

79

80 uint32 DrawContext::Draw(int texture) {

81 DCHECK(program_ != GL_ZERO);

82 WebKit::WebGraphicsContext3D* context3D = context_->GetContext3D();

83

84 context3D->useProgram(program_);

85

86 context3D->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

87 context3D->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

88 context3D->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

89 context3D->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

90

91 context3D->uniform1i(texture_uniform_, 0);

92 context3D->activeTexture(GL_TEXTURE0);

93 context3D->bindTexture(GL_TEXTURE_2D, texture);

94

95 context3D->bindBuffer(GL_ARRAY_BUFFER, vertex_buffer_);

96 context3D->enableVertexAttribArray(0);

97 context3D->vertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);

98 context3D->bindAttribLocation(program_, 0, "a_Position");

99 context3D->enableVertexAttribArray(1);

100 context3D->vertexAttribPointer(

101 1, 2, GL_FLOAT, GL_FALSE, 0, 8 * sizeof(GLfloat));

102 context3D->bindAttribLocation(program_, 1, "a_texCoord");

103

104 context3D->drawArrays(GL_TRIANGLE_STRIP, 0, 4);

105

106 context3D->prepareTexture();

107

108 return context_->InsertSyncPoint();

109 }

110

111 void DrawContext::Reshape(int width, int height) {

112 WebKit::WebGraphicsContext3D* context3D = context_->GetContext3D();

113 context3D->viewport(0, 0, width, height);

114 context3D->reshape(width, height);

115 }

116

117 } // namespace content

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