303 lines
8.0 KiB
C++
303 lines
8.0 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include "Common/CommonPaths.h"
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#include "Common/FileUtil.h"
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#include "Common/StringUtil.h"
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#include "VideoBackends/OGL/FramebufferManager.h"
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#include "VideoBackends/OGL/GLUtil.h"
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#include "VideoBackends/OGL/PostProcessing.h"
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#include "VideoBackends/OGL/ProgramShaderCache.h"
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#include "VideoCommon/VideoCommon.h"
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#include "VideoCommon/VideoConfig.h"
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namespace OGL
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{
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static char s_vertex_shader[] =
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"out vec2 uv0;\n"
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"void main(void) {\n"
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" vec2 rawpos = vec2(gl_VertexID&1, gl_VertexID&2);\n"
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" gl_Position = vec4(rawpos*2.0-1.0, 0.0, 1.0);\n"
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" uv0 = rawpos;\n"
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"}\n";
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OpenGLPostProcessing::OpenGLPostProcessing()
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{
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m_enable = false;
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m_width = 0;
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m_height = 0;
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glGenFramebuffers(1, &m_fbo);
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glGenTextures(1, &m_texture);
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glBindTexture(GL_TEXTURE_2D, m_texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); // disable mipmaps
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture, 0);
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FramebufferManager::SetFramebuffer(0);
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CreateHeader();
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}
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OpenGLPostProcessing::~OpenGLPostProcessing()
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{
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m_shader.Destroy();
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glDeleteFramebuffers(1, &m_fbo);
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glDeleteTextures(1, &m_texture);
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}
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void OpenGLPostProcessing::BindTargetFramebuffer()
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{
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_enable ? m_fbo : 0);
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}
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void OpenGLPostProcessing::BlitToScreen()
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{
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if (!m_enable) return;
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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glViewport(0, 0, m_width, m_height);
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m_shader.Bind();
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glUniform4f(m_uniform_resolution, (float)m_width, (float)m_height, 1.0f/(float)m_width, 1.0f/(float)m_height);
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glUniform1ui(m_uniform_time, (GLuint)m_timer.GetTimeElapsed());
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if (m_config.IsDirty())
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{
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for (auto& it : m_config.GetOptions())
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{
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if (it.second.m_dirty)
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{
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switch (it.second.m_type)
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{
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case PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_BOOL:
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glUniform1i(m_uniform_bindings[it.first], it.second.m_bool_value);
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break;
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case PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_INTEGER:
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switch (it.second.m_integer_values.size())
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{
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case 1:
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glUniform1i(m_uniform_bindings[it.first], it.second.m_integer_values[0]);
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break;
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case 2:
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glUniform2i(m_uniform_bindings[it.first],
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it.second.m_integer_values[0],
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it.second.m_integer_values[1]);
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break;
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case 3:
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glUniform3i(m_uniform_bindings[it.first],
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it.second.m_integer_values[0],
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it.second.m_integer_values[1],
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it.second.m_integer_values[2]);
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break;
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case 4:
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glUniform4i(m_uniform_bindings[it.first],
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it.second.m_integer_values[0],
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it.second.m_integer_values[1],
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it.second.m_integer_values[2],
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it.second.m_integer_values[3]);
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break;
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}
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break;
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case PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_FLOAT:
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switch (it.second.m_float_values.size())
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{
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case 1:
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glUniform1f(m_uniform_bindings[it.first], it.second.m_float_values[0]);
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break;
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case 2:
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glUniform2f(m_uniform_bindings[it.first],
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it.second.m_float_values[0],
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it.second.m_float_values[1]);
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break;
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case 3:
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glUniform3f(m_uniform_bindings[it.first],
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it.second.m_float_values[0],
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it.second.m_float_values[1],
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it.second.m_float_values[2]);
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break;
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case 4:
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glUniform4f(m_uniform_bindings[it.first],
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it.second.m_float_values[0],
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it.second.m_float_values[1],
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it.second.m_float_values[2],
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it.second.m_float_values[3]);
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break;
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}
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break;
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}
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it.second.m_dirty = false;
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}
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}
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m_config.SetDirty(false);
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}
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glActiveTexture(GL_TEXTURE0+9);
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glBindTexture(GL_TEXTURE_2D, m_texture);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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void OpenGLPostProcessing::Update(u32 width, u32 height)
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{
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ApplyShader();
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if (m_enable && (width != m_width || height != m_height))
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{
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m_width = width;
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m_height = height;
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// alloc texture for framebuffer
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glActiveTexture(GL_TEXTURE0+9);
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glBindTexture(GL_TEXTURE_2D, m_texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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}
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}
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void OpenGLPostProcessing::ApplyShader()
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{
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// shader didn't changed
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if (m_config.GetShader() == g_ActiveConfig.sPostProcessingShader) return;
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m_enable = false;
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m_shader.Destroy();
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m_uniform_bindings.clear();
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// shader disabled
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if (g_ActiveConfig.sPostProcessingShader == "") return;
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// so need to compile shader
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std::string code = m_config.LoadShader();
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if (code == "") return;
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code = LoadShaderOptions(code);
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// and compile it
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if (!ProgramShaderCache::CompileShader(m_shader, s_vertex_shader, code.c_str())) {
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ERROR_LOG(VIDEO, "Failed to compile post-processing shader %s", m_config.GetShader().c_str());
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return;
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}
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// read uniform locations
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m_uniform_resolution = glGetUniformLocation(m_shader.glprogid, "resolution");
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m_uniform_time = glGetUniformLocation(m_shader.glprogid, "time");
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for (const auto& it : m_config.GetOptions())
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{
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std::string glsl_name = "option_" + it.first;
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m_uniform_bindings[it.first] = glGetUniformLocation(m_shader.glprogid, glsl_name.c_str());
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}
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// successful
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m_enable = true;
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}
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void OpenGLPostProcessing::CreateHeader()
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{
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m_glsl_header =
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// Required variables
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// Shouldn't be accessed directly by the PP shader
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// Texture sampler
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"SAMPLER_BINDING(8) uniform sampler2D samp8;\n"
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"SAMPLER_BINDING(9) uniform sampler2D samp9;\n"
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// Output variable
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"out float4 ocol0;\n"
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// Input coordinates
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"in float2 uv0;\n"
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// Resolution
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"uniform float4 resolution;\n"
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// Time
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"uniform uint time;\n"
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// Interfacing functions
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"float4 Sample()\n"
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"{\n"
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"\treturn texture(samp9, uv0);\n"
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"}\n"
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"float4 SampleLocation(float2 location)\n"
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"{\n"
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"\treturn texture(samp9, location);\n"
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"}\n"
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"#define SampleOffset(offset) textureOffset(samp9, uv0, offset)\n"
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"float4 SampleFontLocation(float2 location)\n"
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"{\n"
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"\treturn texture(samp8, location);\n"
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"}\n"
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"float2 GetResolution()\n"
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"{\n"
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"\treturn resolution.xy;\n"
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"}\n"
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"float2 GetInvResolution()\n"
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"{\n"
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"\treturn resolution.zw;\n"
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"}\n"
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"float2 GetCoordinates()\n"
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"{\n"
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"\treturn uv0;\n"
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"}\n"
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"uint GetTime()\n"
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"{\n"
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"\treturn time;\n"
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"}\n"
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"void SetOutput(float4 color)\n"
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"{\n"
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"\tocol0 = color;\n"
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"}\n"
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"#define GetOption(x) (option_#x)\n"
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"#define OptionEnabled(x) (option_#x != 0)\n";
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}
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std::string OpenGLPostProcessing::LoadShaderOptions(const std::string& code)
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{
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std::string glsl_options = "";
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m_uniform_bindings.clear();
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for (const auto& it : m_config.GetOptions())
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{
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if (it.second.m_type == PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_BOOL)
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{
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glsl_options += StringFromFormat("uniform int option_%s;\n", it.first.c_str());
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}
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else if (it.second.m_type == PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_INTEGER)
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{
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u32 count = it.second.m_integer_values.size();
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if (count == 1)
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glsl_options += StringFromFormat("uniform int option_%s;\n", it.first.c_str());
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else
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glsl_options += StringFromFormat("uniform int%d option_%s;\n", count, it.first.c_str());
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}
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else if (it.second.m_type == PostProcessingShaderConfiguration::ConfigurationOption::OptionType::OPTION_FLOAT)
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{
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u32 count = it.second.m_float_values.size();
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if (count == 1)
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glsl_options += StringFromFormat("uniform float option_%s;\n", it.first.c_str());
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else
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glsl_options += StringFromFormat("uniform float%d option_%s;\n", count, it.first.c_str());
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}
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m_uniform_bindings[it.first] = 0;
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}
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return m_glsl_header + glsl_options + code;
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}
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} // namespace OGL
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