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Don't create a color renderbuffer for shadow map 

When rendering the shadow map offscreen using framebuffer objects, it's
not necessary to create a color renderbuffer. Currently
FramebufferParams only lets you choose between a renderbuffer and a
texture for both color and depth attachments. This changes that, and now
you can ask for a texture, a renderbuffer, or nothing.

This improves performance. On my computer, with an 8192x8192 shadow map,
this improves overall frame time by 8.0%.
1008-fix
AbigailBuccaneer 2018-05-04 18:13:24 +01:00
parent 94a18e9648
commit c027b54add
3 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/graphics/core/framebuffer.h
View File

@ -41,10 +41,15 @@ struct FramebufferParams
int depth = 16;
//! Requested number of samples for multisampling
int samples = 1;
//! true requests color texture
bool colorTexture = false;
//! true requests depth texture
bool depthTexture = false;
enum class AttachmentType
{
Texture,
Renderbuffer,
None,
};
AttachmentType colorAttachment = AttachmentType::Renderbuffer;
AttachmentType depthAttachment = AttachmentType::Renderbuffer;
//! Loads default values
void LoadDefault()

3
src/graphics/engine/engine.cpp
View File

@ -3786,7 +3786,8 @@ void CEngine::RenderShadowMap()
FramebufferParams params;
params.width = params.height = width;
params.depth = depth = 32;
params.depthTexture = true;
params.colorAttachment = FramebufferParams::AttachmentType::None;
params.depthAttachment = FramebufferParams::AttachmentType::Texture;
CFramebuffer *framebuffer = m_device->CreateFramebuffer("shadow", params);
if (framebuffer == nullptr)

24
src/graphics/opengl/glframebuffer.cpp
View File

@ -55,7 +55,7 @@ bool CGLFramebuffer::Create()
glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
// create color texture
if (m_params.colorTexture)
if (m_params.colorAttachment == FramebufferParams::AttachmentType::Texture)
{
GLint previous;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &previous);
@ -76,7 +76,7 @@ bool CGLFramebuffer::Create()
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_colorTexture, 0);
}
// create color renderbuffer
else
else if (m_params.colorAttachment == FramebufferParams::AttachmentType::Renderbuffer)
{
glGenRenderbuffers(1, &m_colorRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, m_colorRenderbuffer);
@ -92,6 +92,10 @@ bool CGLFramebuffer::Create()
glFramebufferRenderbuffer(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_colorRenderbuffer);
}
else
{
glDrawBuffer(GL_NONE);
}
GLuint depthFormat = 0;
@ -104,7 +108,7 @@ bool CGLFramebuffer::Create()
}
// create depth texture
if (m_params.depthTexture)
if (m_params.depthAttachment == FramebufferParams::AttachmentType::Texture)
{
GLint previous;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &previous);
@ -132,7 +136,7 @@ bool CGLFramebuffer::Create()
GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_depthTexture, 0);
}
// create depth renderbuffer
else
else if (m_params.depthAttachment == FramebufferParams::AttachmentType::Renderbuffer)
{
glGenRenderbuffers(1, &m_depthRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, m_depthRenderbuffer);
@ -323,7 +327,7 @@ bool CGLFramebufferEXT::Create()
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
// create color texture
if (m_params.colorTexture)
if (m_params.colorAttachment == FramebufferParams::AttachmentType::Texture)
{
GLint previous;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &previous);
@ -346,7 +350,7 @@ bool CGLFramebufferEXT::Create()
GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, m_colorTexture, 0);
}
// create color renderbuffer
else
else if (m_params.colorAttachment == FramebufferParams::AttachmentType::Renderbuffer)
{
glGenRenderbuffersEXT(1, &m_colorRenderbuffer);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_colorRenderbuffer);
@ -363,6 +367,10 @@ bool CGLFramebufferEXT::Create()
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, m_colorRenderbuffer);
}
else
{
glDrawBuffer(GL_NONE);
}
GLuint depthFormat = 0;
@ -375,7 +383,7 @@ bool CGLFramebufferEXT::Create()
}
// create depth texture
if (m_params.depthTexture)
if (m_params.depthAttachment == FramebufferParams::AttachmentType::Texture)
{
GLint previous;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &previous);
@ -403,7 +411,7 @@ bool CGLFramebufferEXT::Create()
GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, m_depthTexture, 0);
}
// create depth renderbuffer
else
else if (m_params.depthAttachment == FramebufferParams::AttachmentType::Renderbuffer)
{
glGenRenderbuffersEXT(1, &m_depthRenderbuffer);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_depthRenderbuffer);