1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
#include "transparent_layer.hpp"
#include "drape/data_buffer.hpp"
#include "drape/glconstants.hpp"
#include "drape/glextensions_list.hpp"
#include "drape/glfunctions.hpp"
#include "drape/glstate.hpp"
#include "drape/gpu_program_manager.hpp"
#include "drape/shader_def.hpp"
#include "drape/uniform_values_storage.hpp"
#include "geometry/screenbase.hpp"
#include "std/cmath.hpp"
namespace df
{
TransparentLayer::TransparentLayer()
{
m_vertices = {
-1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f,
1.0f, -1.0f, 1.0f, 0.0f };
}
TransparentLayer::~TransparentLayer()
{
if (m_bufferId != 0)
GLFunctions::glDeleteBuffer(m_bufferId);
}
void TransparentLayer::Build(ref_ptr<dp::GpuProgram> prg)
{
m_attributePosition = prg->GetAttributeLocation("a_pos");
ASSERT_NOT_EQUAL(m_attributePosition, -1, ());
m_attributeTexCoord = prg->GetAttributeLocation("a_tcoord");
ASSERT_NOT_EQUAL(m_attributeTexCoord, -1, ());
m_bufferId = GLFunctions::glGenBuffer();
GLFunctions::glBindBuffer(m_bufferId, gl_const::GLArrayBuffer);
GLFunctions::glBufferData(gl_const::GLArrayBuffer, m_vertices.size() * sizeof(m_vertices[0]),
m_vertices.data(), gl_const::GLStaticDraw);
GLFunctions::glBindBuffer(0, gl_const::GLArrayBuffer);
}
void TransparentLayer::Render(uint32_t textureId, ref_ptr<dp::GpuProgramManager> mng)
{
// Unbind current VAO, because glVertexAttributePointer and glEnableVertexAttribute can affect it.
if (dp::GLExtensionsList::Instance().IsSupported(dp::GLExtensionsList::VertexArrayObject))
GLFunctions::glBindVertexArray(0);
ref_ptr<dp::GpuProgram> prg = mng->GetProgram(gpu::TRANSPARENT_LAYER_PROGRAM);
prg->Bind();
if (m_bufferId == 0)
Build(prg);
GLFunctions::glActiveTexture(gl_const::GLTexture0);
GLFunctions::glBindTexture(textureId);
GLFunctions::glBindBuffer(m_bufferId, gl_const::GLArrayBuffer);
GLFunctions::glEnableVertexAttribute(m_attributePosition);
GLFunctions::glVertexAttributePointer(m_attributePosition, 2, gl_const::GLFloatType, false,
sizeof(float) * 4, 0);
GLFunctions::glEnableVertexAttribute(m_attributeTexCoord);
GLFunctions::glVertexAttributePointer(m_attributeTexCoord, 2, gl_const::GLFloatType, false,
sizeof(float) * 4, sizeof(float) * 2);
GLFunctions::glEnable(gl_const::GLBlending);
GLFunctions::glDrawArrays(gl_const::GLTriangleStrip, 0, 4);
GLFunctions::glDisable(gl_const::GLBlending);
prg->Unbind();
GLFunctions::glBindTexture(0);
GLFunctions::glBindBuffer(0, gl_const::GLArrayBuffer);
}
} // namespace df
|
