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OpenGLRenderer: Fix Y flipping for FBOs

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This commit is contained in:
Jérôme Leclercq
2021-02-20 19:23:29 +01:00
parent fb3468854f
commit 311cfeaf3c
8 changed files with 83 additions and 9 deletions
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36
src/Nazara/Shader/GlslWriter.cpp
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@@ -10,6 +10,7 @@
#include <Nazara/Shader/ShaderAstCloner.hpp>
#include <Nazara/Shader/ShaderAstUtils.hpp>
#include <Nazara/Shader/ShaderAstValidator.hpp>
#include <optional>
#include <stdexcept>
#include <Nazara/Shader/Debug.hpp>
@@ -17,6 +18,8 @@ namespace Nz
{
namespace
{
static const char* flipYUniformName = "_NzFlipValue";
struct AstAdapter : ShaderAstCloner
{
void Visit(ShaderNodes::AssignOp& node) override
@@ -35,8 +38,11 @@ namespace Nz
if (builtinVar.entry != ShaderNodes::BuiltinEntry::VertexPosition)
return ShaderAstCloner::Visit(node);
auto fixYConstant = ShaderBuilder::Constant(Nz::Vector4f(1.f, -1.f, 1.f, 1.f));
auto mulFix = ShaderBuilder::Multiply(CloneExpression(node.right), fixYConstant);
auto flipVar = ShaderBuilder::Uniform(flipYUniformName, ShaderNodes::BasicType::Float1);
auto oneConstant = ShaderBuilder::Constant(1.f);
auto fixYValue = ShaderBuilder::Cast<ShaderNodes::BasicType::Float4>(oneConstant, ShaderBuilder::Identifier(flipVar), oneConstant, oneConstant);
auto mulFix = ShaderBuilder::Multiply(CloneExpression(node.right), fixYValue);
PushExpression(ShaderNodes::AssignOp::Build(node.op, CloneExpression(node.left), mulFix));
}
@@ -50,8 +56,21 @@ namespace Nz
{
}
std::string GlslWriter::Generate(const ShaderAst& shader, const States& conditions)
std::string GlslWriter::Generate(const ShaderAst& inputShader, const States& conditions)
{
const ShaderAst* selectedShader = &inputShader;
std::optional<ShaderAst> modifiedShader;
if (inputShader.GetStage() == ShaderStageType::Vertex && m_environment.flipYPosition)
{
modifiedShader.emplace(inputShader);
modifiedShader->AddUniform(flipYUniformName, ShaderNodes::BasicType::Float1);
selectedShader = &modifiedShader.value();
}
const ShaderAst& shader = *selectedShader;
std::string error;
if (!ValidateShader(shader, &error))
throw std::runtime_error("Invalid shader AST: " + error);
@@ -172,9 +191,9 @@ namespace Nz
const char* inKeyword = (glslVersion >= 130) ? "in" : "varying";
const char* outKeyword = (glslVersion >= 130) ? "out" : "varying";
DeclareVariables(shader, shader.GetUniforms(), "uniform", "Uniforms");
DeclareVariables(shader, shader.GetInputs(), inKeyword, "Inputs");
DeclareVariables(shader, shader.GetOutputs(), outKeyword, "Outputs");
DeclareVariables(shader, shader.GetUniforms(), "uniform", "Uniforms");
DeclareVariables(shader, shader.GetInputs(), inKeyword, "Inputs");
DeclareVariables(shader, shader.GetOutputs(), outKeyword, "Outputs");
std::size_t functionCount = shader.GetFunctionCount();
if (functionCount > 1)
@@ -201,6 +220,11 @@ namespace Nz
m_environment = std::move(environment);
}
const char* GlslWriter::GetFlipYUniformName()
{
return flipYUniformName;
}
void GlslWriter::Append(ShaderExpressionType type)
{
std::visit([&](auto&& arg)