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#include "Material.h"
#include "RenderResources.h"
#include "GL/GLShaderProgram.h"
#include "GL/GLUniform.h"
#include "GL/GLTexture.h"
#include "Texture.h"
#include <cstddef> // for offsetof()
namespace nCine
{
Material::Material()
: Material(nullptr, nullptr)
{
}
Material::Material(GLShaderProgram* program, GLTexture* texture)
: isBlendingEnabled_(false), srcBlendingFactor_(GL_SRC_ALPHA), destBlendingFactor_(GL_ONE_MINUS_SRC_ALPHA),
shaderProgramType_(ShaderProgramType::Custom), shaderProgram_(program), uniformsHostBufferSize_(0)
{
for (std::uint32_t i = 0; i < GLTexture::MaxTextureUnits; i++) {
textures_[i] = nullptr;
}
textures_[0] = texture;
if (program != nullptr) {
SetShaderProgram(program);
}
}
void Material::SetBlendingFactors(GLenum srcBlendingFactor, GLenum destBlendingFactor)
{
srcBlendingFactor_ = srcBlendingFactor;
destBlendingFactor_ = destBlendingFactor;
}
bool Material::SetShaderProgramType(ShaderProgramType shaderProgramType)
{
GLShaderProgram* shaderProgram = RenderResources::GetShaderProgram(shaderProgramType);
if (shaderProgram == nullptr || shaderProgram == shaderProgram_) {
return false;
}
SetShaderProgram(shaderProgram);
// Should be assigned after calling `setShaderProgram()`
shaderProgramType_ = shaderProgramType;
return true;
}
void Material::SetShaderProgram(GLShaderProgram* program)
{
// Allow self-assignment to take into account the case where the shader program loads new shaders
shaderProgramType_ = ShaderProgramType::Custom;
shaderProgram_ = program;
// The camera uniforms are handled separately as they have a different update frequency
shaderUniforms_.SetProgram(shaderProgram_, nullptr, ProjectionViewMatrixExcludeString);
shaderUniformBlocks_.SetProgram(shaderProgram_);
RenderResources::SetDefaultAttributesParameters(*shaderProgram_);
}
bool Material::SetShader(Shader* shader)
{
GLShaderProgram* shaderProgram = shader->glShaderProgram_.get();
if (shaderProgram == shaderProgram_) {
return false;
}
SetShaderProgram(shaderProgram);
return true;
}
void Material::SetDefaultAttributesParameters()
{
RenderResources::SetDefaultAttributesParameters(*shaderProgram_);
}
void Material::ReserveUniformsDataMemory()
{
DEATH_ASSERT(shaderProgram_);
// Total memory size for all uniforms and uniform blocks
const std::uint32_t uniformsSize = shaderProgram_->GetUniformsSize() + shaderProgram_->GetUniformBlocksSize();
if (uniformsSize > uniformsHostBufferSize_) {
uniformsHostBuffer_ = std::make_unique<GLubyte[]>(uniformsSize);
uniformsHostBufferSize_ = uniformsSize;
}
GLubyte* dataPointer = uniformsHostBuffer_.get();
shaderUniforms_.SetUniformsDataPointer(dataPointer);
shaderUniformBlocks_.SetUniformsDataPointer(&dataPointer[shaderProgram_->GetUniformsSize()]);
}
void Material::SetUniformsDataPointer(GLubyte* dataPointer)
{
DEATH_ASSERT(shaderProgram_);
DEATH_ASSERT(dataPointer);
uniformsHostBuffer_.reset(nullptr);
uniformsHostBufferSize_ = 0;
shaderUniforms_.SetUniformsDataPointer(dataPointer);
shaderUniformBlocks_.SetUniformsDataPointer(&dataPointer[shaderProgram_->GetUniformsSize()]);
}
const GLTexture* Material::GetTexture(std::uint32_t unit) const
{
const GLTexture* texture = nullptr;
if (unit < GLTexture::MaxTextureUnits) {
texture = textures_[unit];
}
return texture;
}
bool Material::SetTexture(std::uint32_t unit, const GLTexture* texture)
{
bool result = false;
if (unit < GLTexture::MaxTextureUnits) {
textures_[unit] = texture;
result = true;
}
return result;
}
bool Material::SetTexture(std::uint32_t unit, const Texture& texture)
{
return SetTexture(unit, texture.glTexture_.get());
}
void Material::Bind()
{
for (std::uint32_t i = 0; i < GLTexture::MaxTextureUnits; i++) {
if (textures_[i] != nullptr) {
textures_[i]->Bind(i);
} else {
GLTexture::Unbind(i);
}
}
if (shaderProgram_) {
shaderProgram_->Use();
shaderUniformBlocks_.Bind();
}
}
void Material::DefineVertexFormat(const GLBufferObject* vbo, const GLBufferObject* ibo, std::uint32_t vboOffset)
{
shaderProgram_->DefineVertexFormat(vbo, ibo, vboOffset);
}
namespace
{
uint8_t glBlendingFactorToInt(GLenum blendingFactor)
{
switch (blendingFactor) {
case GL_ZERO: return 0;
case GL_ONE: return 1;
case GL_SRC_COLOR: return 2;
case GL_ONE_MINUS_SRC_COLOR: return 3;
case GL_DST_COLOR: return 4;
case GL_ONE_MINUS_DST_COLOR: return 5;
case GL_SRC_ALPHA: return 6;
case GL_ONE_MINUS_SRC_ALPHA: return 7;
case GL_DST_ALPHA: return 8;
case GL_ONE_MINUS_DST_ALPHA: return 9;
case GL_CONSTANT_COLOR: return 10;
case GL_ONE_MINUS_CONSTANT_COLOR: return 11;
case GL_CONSTANT_ALPHA: return 12;
case GL_ONE_MINUS_CONSTANT_ALPHA: return 13;
case GL_SRC_ALPHA_SATURATE: return 14;
}
return 0;
}
struct SortHashData
{
GLuint textures[GLTexture::MaxTextureUnits];
GLuint shaderProgram;
std::uint8_t srcBlendingFactor;
std::uint8_t destBlendingFactor;
};
}
std::uint32_t Material::GetSortKey()
{
constexpr std::uint32_t Seed = 1697381921;
// Align to 64 bits for `fasthash64()` to properly work on Emscripten without alignment faults
static SortHashData hashData alignas(8);
for (std::uint32_t i = 0; i < GLTexture::MaxTextureUnits; i++) {
hashData.textures[i] = (textures_[i] != nullptr) ? textures_[i]->GetGLHandle() : 0;
}
hashData.shaderProgram = shaderProgram_->GetGLHandle();
hashData.srcBlendingFactor = glBlendingFactorToInt(srcBlendingFactor_);
hashData.destBlendingFactor = glBlendingFactorToInt(destBlendingFactor_);
return (std::uint32_t)xxHash3(reinterpret_cast<const void*>(&hashData), sizeof(SortHashData), Seed);
}
}
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