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-rw-r--r--src/platform/opengl/opengl_framebuffer.cpp237
-rw-r--r--src/platform/opengl/opengl_framebuffer.h35
-rw-r--r--src/platform/opengl/opengl_renderer_api.cpp6
-rw-r--r--src/platform/opengl/opengl_renderer_api.h4
-rw-r--r--src/platform/vulkan/vulkan_renderer_api.cpp5
-rw-r--r--src/platform/vulkan/vulkan_renderer_api.h2
6 files changed, 289 insertions, 0 deletions
diff --git a/src/platform/opengl/opengl_framebuffer.cpp b/src/platform/opengl/opengl_framebuffer.cpp
new file mode 100644
index 0000000..c5b8fe2
--- /dev/null
+++ b/src/platform/opengl/opengl_framebuffer.cpp
@@ -0,0 +1,237 @@
+#include "opengl_framebuffer.h"
+#include "core/log.h"
+
+#include <glad/glad.h>
+
+namespace Donut
+{
+ namespace Utils
+ {
+ static GLenum texture_target(bool multisampled)
+ {
+ return multisampled ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D;
+ }
+
+ static void bind_texture(bool multisampled, uint32_t id)
+ {
+ glBindTexture(texture_target(multisampled), id);
+ }
+
+ static void create_textures(bool multisampled, uint32_t* out_id, uint32_t count)
+ {
+ glCreateTextures(texture_target(multisampled), count, out_id);
+ }
+
+ static void attach_color_texture(uint32_t id, int samples, GLenum internal_format, GLenum format, uint32_t width, uint32_t height, int index)
+ {
+ bool multisampled = samples > 1;
+ if (multisampled)
+ {
+ glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, internal_format, width, height, GL_FALSE);
+ }
+ else
+ {
+ glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, nullptr);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ }
+
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, texture_target(multisampled), id, 0);
+ }
+
+ static void attach_depth_texture(uint32_t id, int samples, GLenum format, GLenum attachment_type, uint32_t width, uint32_t height)
+ {
+ bool multisampled = samples > 1;
+ if (multisampled)
+ {
+ glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, format, width, height, GL_FALSE);
+ }
+ else
+ {
+ glTexStorage2D(GL_TEXTURE_2D, 1, format, width, height);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ }
+
+ glFramebufferTexture2D(GL_FRAMEBUFFER, attachment_type, texture_target(multisampled), id, 0);
+ }
+
+ static bool is_depth_format(FramebufferTextureFormat format)
+ {
+ switch (format)
+ {
+ case FramebufferTextureFormat::DEPTH24STENCIL8: return true;
+ }
+ return false;
+ }
+
+ static GLenum donut_fb_texture_format_to_gl(FramebufferTextureFormat format)
+ {
+ switch (format)
+ {
+ case FramebufferTextureFormat::RGBA8: return GL_RGBA8;
+ case FramebufferTextureFormat::RED_INTEGER: return GL_RED_INTEGER;
+ }
+
+ return 0;
+ }
+ }
+
+ OpenGLFramebuffer::OpenGLFramebuffer(const FramebufferSpecification& spec)
+ : m_specification(spec)
+ {
+ for (auto spec : m_specification.attachments.attachments)
+ {
+ if (!Utils::is_depth_format(spec.texture_format))
+ m_color_attachment_specifications.emplace_back(spec);
+ else
+ m_depth_attachment_specification = spec;
+ }
+
+ invalidate();
+ }
+
+ OpenGLFramebuffer::~OpenGLFramebuffer()
+ {
+ glDeleteFramebuffers(1, &m_renderer_id);
+ glDeleteTextures(static_cast<GLsizei>(m_color_attachments.size()), m_color_attachments.data());
+ glDeleteTextures(1, &m_depth_attachment);
+ }
+
+ void OpenGLFramebuffer::invalidate()
+ {
+ if (m_renderer_id)
+ {
+ glDeleteFramebuffers(1, &m_renderer_id);
+ glDeleteTextures(static_cast<GLsizei>(m_color_attachments.size()), m_color_attachments.data());
+ glDeleteTextures(1, &m_depth_attachment);
+
+ m_color_attachments.clear();
+ m_depth_attachment = 0;
+ }
+
+ glCreateFramebuffers(1, &m_renderer_id);
+ glBindFramebuffer(GL_FRAMEBUFFER, m_renderer_id);
+
+ bool multisample = m_specification.Samples > 1;
+
+ if (m_color_attachment_specifications.size())
+ {
+ m_color_attachments.resize(m_color_attachment_specifications.size());
+ Utils::create_textures(multisample, m_color_attachments.data(), static_cast<uint32_t>(m_color_attachments.size()));
+
+ for (size_t i = 0; i < m_color_attachments.size(); i++)
+ {
+ Utils::bind_texture(multisample, m_color_attachments[i]);
+ switch (m_color_attachment_specifications[i].texture_format)
+ {
+ case FramebufferTextureFormat::RGBA8:
+ Utils::attach_color_texture(m_color_attachments[i], m_specification.Samples, GL_RGBA8, GL_RGBA, m_specification.Width, m_specification.Height, static_cast<int>(i));
+ break;
+ case FramebufferTextureFormat::RED_INTEGER:
+ Utils::attach_color_texture(m_color_attachments[i], m_specification.Samples, GL_R32I, GL_RED_INTEGER, m_specification.Width, m_specification.Height, static_cast<int>(i));
+ break;
+ }
+ }
+ }
+
+ if (m_depth_attachment_specification.texture_format != FramebufferTextureFormat::None)
+ {
+ Utils::create_textures(multisample, &m_depth_attachment, 1);
+ Utils::bind_texture(multisample, m_depth_attachment);
+ switch (m_depth_attachment_specification.texture_format)
+ {
+ case FramebufferTextureFormat::DEPTH24STENCIL8:
+ Utils::attach_depth_texture(m_depth_attachment, m_specification.Samples, GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL_ATTACHMENT, m_specification.Width, m_specification.Height);
+ break;
+ }
+ }
+
+ if (m_color_attachments.size() > 1)
+ {
+ GLenum buffers[4] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 };
+ glDrawBuffers(static_cast<GLsizei>(m_color_attachments.size()), buffers);
+ }
+ else if (m_color_attachments.empty())
+ glDrawBuffer(GL_NONE);
+
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+ {
+ GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+ switch (status)
+ {
+ case GL_FRAMEBUFFER_UNDEFINED:
+ DONUT_ERROR("Framebuffer is undefined");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
+ DONUT_ERROR("Framebuffer has incomplete attachment");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
+ DONUT_ERROR("Framebuffer is missing attachment");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
+ DONUT_ERROR("Framebuffer has incomplete draw buffer");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
+ DONUT_ERROR("Framebuffer has incomplete read buffer");
+ break;
+ case GL_FRAMEBUFFER_UNSUPPORTED:
+ DONUT_ERROR("Framebuffer format is unsupported");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
+ DONUT_ERROR("Framebuffer has incomplete multisample");
+ break;
+ case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
+ DONUT_ERROR("Framebuffer has incomplete layer targets");
+ break;
+ default:
+ DONUT_ERROR("Framebuffer is incomplete (unknown error: {})", status);
+ break;
+ }
+ }
+
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ }
+
+ void OpenGLFramebuffer::bind()
+ {
+ glBindFramebuffer(GL_FRAMEBUFFER, m_renderer_id);
+ glViewport(0, 0, m_specification.Width, m_specification.Height);
+ }
+
+ void OpenGLFramebuffer::unbind()
+ {
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ }
+
+ void OpenGLFramebuffer::resize(uint32_t width, uint32_t height)
+ {
+ m_specification.Width = width;
+ m_specification.Height = height;
+
+ invalidate();
+ }
+
+ int OpenGLFramebuffer::read_pixel(uint32_t attachment_index, int x, int y)
+ {
+ glReadBuffer(GL_COLOR_ATTACHMENT0 + attachment_index);
+ int pixel_data;
+ glReadPixels(x, y, 1, 1, GL_RED_INTEGER, GL_INT, &pixel_data);
+ return pixel_data;
+ }
+
+ void OpenGLFramebuffer::clear_attachment(uint32_t attachment_index, int value)
+ {
+ auto& spec = m_color_attachment_specifications[attachment_index];
+ glClearTexImage(m_color_attachments[attachment_index], 0,
+ Utils::donut_fb_texture_format_to_gl(spec.texture_format), GL_INT, &value);
+ }
+};
diff --git a/src/platform/opengl/opengl_framebuffer.h b/src/platform/opengl/opengl_framebuffer.h
new file mode 100644
index 0000000..7b07ddd
--- /dev/null
+++ b/src/platform/opengl/opengl_framebuffer.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "rendering/framebuffer.h"
+
+namespace Donut
+{
+ class OpenGLFramebuffer : public Framebuffer
+ {
+ public:
+ OpenGLFramebuffer(const FramebufferSpecification& spec);
+ virtual ~OpenGLFramebuffer();
+
+ void invalidate();
+
+ virtual void bind() override;
+ virtual void unbind() override;
+
+ virtual void resize(uint32_t width, uint32_t height) override;
+ virtual int read_pixel(uint32_t attachment_index, int x, int y) override;
+
+ virtual void clear_attachment(uint32_t attachment_index, int value) override;
+ virtual uint32_t get_color_attachment_renderer_id(uint32_t index = 0) const override { return m_color_attachments[index]; }
+
+ virtual const FramebufferSpecification& get_specification() const override { return m_specification; }
+ private:
+ uint32_t m_renderer_id = 0;
+ FramebufferSpecification m_specification;
+
+ std::vector<FramebufferTextureSpecification> m_color_attachment_specifications;
+ FramebufferTextureSpecification m_depth_attachment_specification = FramebufferTextureFormat::None;
+
+ std::vector<uint32_t> m_color_attachments;
+ uint32_t m_depth_attachment = 0;
+ };
+};
diff --git a/src/platform/opengl/opengl_renderer_api.cpp b/src/platform/opengl/opengl_renderer_api.cpp
index bfb79ac..0012911 100644
--- a/src/platform/opengl/opengl_renderer_api.cpp
+++ b/src/platform/opengl/opengl_renderer_api.cpp
@@ -106,4 +106,10 @@ namespace Donut
glBindImageTexture(slot, texture_id, 0, GL_FALSE, 0,
read_only ? GL_READ_ONLY : GL_WRITE_ONLY, GL_RGBA8);
}
+
+ void OpenGLRendererAPI::read_pixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height,
+ uint32_t format, uint32_t type, void* pixels)
+ {
+ glReadPixels(x, y, width, height, format, type, pixels);
+ }
};
diff --git a/src/platform/opengl/opengl_renderer_api.h b/src/platform/opengl/opengl_renderer_api.h
index 45e6a7b..51985e0 100644
--- a/src/platform/opengl/opengl_renderer_api.h
+++ b/src/platform/opengl/opengl_renderer_api.h
@@ -36,5 +36,9 @@ namespace Donut
virtual void bind_image_texture(uint32_t texture_id,
uint32_t slot = 0,
bool read_only = false) override;
+ virtual void read_pixels(uint32_t x, uint32_t y,
+ uint32_t width, uint32_t height,
+ uint32_t format, uint32_t type,
+ void* pixels) override;
};
};
diff --git a/src/platform/vulkan/vulkan_renderer_api.cpp b/src/platform/vulkan/vulkan_renderer_api.cpp
index 8a3069e..00344fb 100644
--- a/src/platform/vulkan/vulkan_renderer_api.cpp
+++ b/src/platform/vulkan/vulkan_renderer_api.cpp
@@ -57,4 +57,9 @@ namespace Donut
void VulkanRendererAPI::bind_image_texture(uint32_t texture_id, uint32_t slot, bool read_only)
{
}
+
+ void VulkanRendererAPI::read_pixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height,
+ uint32_t format, uint32_t type, void* pixels)
+ {
+ }
};
diff --git a/src/platform/vulkan/vulkan_renderer_api.h b/src/platform/vulkan/vulkan_renderer_api.h
index e1d4566..72ea60a 100644
--- a/src/platform/vulkan/vulkan_renderer_api.h
+++ b/src/platform/vulkan/vulkan_renderer_api.h
@@ -32,5 +32,7 @@ namespace Donut
virtual void bind_image_texture(uint32_t texture_id,
uint32_t slot = 0,
bool read_only = false) override;
+ virtual void read_pixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height,
+ uint32_t format, uint32_t type, void* pixels) override;
};
};
<im@hachem.wtf>