【基于obs开发推流工具教程】-opengl着色器源码分析_default.effect obs源码解析

一，OBS openggl main 顶点着色器和片段着色器源码分析

核心的代码区域：

一个是顶点着色器，一个是片段，源码是通过字符串拼接的
在default.effect 着色器源码中：
拼接后的结果：,
1 ， #version 330

const bool obs_glsl_compile = true;

uniform mat4x4 ViewProj;

in vec4 inputval_vert_in_pos;
in vec2 inputval_vert_in_uv;

out vec2 outputval_uv;

out gl_PerVertex {
vec4 gl_Position;
};

struct VertInOut {
vec4 pos;
vec2 uv;
};

VertInOut VSDefault(VertInOut vert_in)
{
VertInOut vert_out;
vert_out.pos = ((vec4(vert_in.pos.xyz, 1.0)) * (ViewProj));
vert_out.uv = vert_in.uv;
return vert_out;
}

VertInOut _main_wrap(VertInOut vert_in)
{
return VSDefault(vert_in);
}

void main(void)
{
VertInOut vert_in;
VertInOut outputval;

vert_in.pos = inputval_vert_in_pos;
vert_in.uv = inputval_vert_in_uv;

outputval = _main_wrap(vert_in);

gl_Position = outputval.pos;
outputval_uv = outputval.uv;
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}

2，#version 330

const bool obs_glsl_compile = true;

uniform sampler2D image;

in vec2 _vertex_shader_attrib0;

out vec4 _pixel_shader_attrib0;

struct VertInOut {
vec4 pos;
vec2 uv;
};

vec4 PSDrawBare(VertInOut vert_in)
{
return texture(image, vert_in.uv);
}

vec4 _main_wrap(VertInOut vert_in)
{
return PSDrawBare(vert_in);
}

void main(void)
{
VertInOut vert_in;
vert_in.pos = gl_FragCoord;
vert_in.uv = _vertex_shader_attrib0;

_pixel_shader_attrib0 = _main_wrap(vert_in);
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}
拼接地方：