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OpenGL: attributeless rendering for postprocessing

This commit is contained in:
degasus 2013-11-25 12:36:17 +01:00
parent 38fe05b1df
commit 6ed3f82aff
1 changed files with 4 additions and 30 deletions
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34
Source/Core/VideoBackends/OGL/Src/PostProcessing.cpp
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@ -25,18 +25,15 @@ static u32 s_width;
static u32 s_height;
static GLuint s_fbo;
static GLuint s_texture;
static GLuint s_vao;
static GLuint s_vbo;
static GLuint s_uniform_resolution;
static char s_vertex_shader[] =
"in vec2 rawpos;\n"
"in vec2 tex0;\n"
"out vec2 uv0;\n"
"void main(void) {\n"
" gl_Position = vec4(rawpos,0,1);\n"
" uv0 = tex0;\n"
" vec2 rawpos = vec2(gl_VertexID&1, gl_VertexID&2);\n"
" gl_Position = vec4(rawpos*2.0-1.0, 0.0, 1.0);\n"
" uv0 = rawpos;\n"
"}\n";
void Init()
@ -56,34 +53,14 @@ void Init()
glBindFramebuffer(GL_FRAMEBUFFER, s_fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, s_texture, 0);
FramebufferManager::SetFramebuffer(0);
glGenBuffers(1, &s_vbo);
glBindBuffer(GL_ARRAY_BUFFER, s_vbo);
GLfloat vertices[] = {
-1.f, -1.f, 0.f, 0.f,
-1.f, 1.f, 0.f, 1.f,
1.f, -1.f, 1.f, 0.f,
1.f, 1.f, 1.f, 1.f
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glGenVertexArrays(1, &s_vao);
glBindVertexArray( s_vao );
glEnableVertexAttribArray(SHADER_POSITION_ATTRIB);
glVertexAttribPointer(SHADER_POSITION_ATTRIB, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, NULL);
glEnableVertexAttribArray(SHADER_TEXTURE0_ATTRIB);
glVertexAttribPointer(SHADER_TEXTURE0_ATTRIB, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, (GLfloat*)NULL+2);
}
void Shutdown()
{
s_shader.Destroy();
glDeleteFramebuffers(1, &s_vbo);
glDeleteFramebuffers(1, &s_fbo);
glDeleteTextures(1, &s_texture);
glDeleteBuffers(1, &s_vbo);
glDeleteVertexArrays(1, &s_vao);
}
void ReloadShader()
@ -103,7 +80,6 @@ void BlitToScreen()
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glViewport(0, 0, s_width, s_height);
glBindVertexArray(s_vao);
s_shader.Bind();
glUniform4f(s_uniform_resolution, (float)s_width, (float)s_height, 1.0f/(float)s_width, 1.0f/(float)s_height);
@ -111,7 +87,6 @@ void BlitToScreen()
glActiveTexture(GL_TEXTURE0+9);
glBindTexture(GL_TEXTURE_2D, s_texture);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindTexture(GL_TEXTURE_2D, 0);
/* glBindFramebuffer(GL_READ_FRAMEBUFFER, s_fbo);
@ -132,7 +107,6 @@ void Update ( u32 width, u32 height )
glActiveTexture(GL_TEXTURE0+9);
glBindTexture(GL_TEXTURE_2D, s_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);
}
}