Somewhat dirty but functional helper to save a texture

Useful for debugging and not much else.

2 files changed, 30 insertions, 0 deletions

diff --git a/gfx/models/texture.cpp b/gfx/models/texture.cpp
index ab04f4f..ff38d0f 100644
--- a/gfx/models/texture.cpp
+++ b/gfx/models/texture.cpp
@@ -2,7 +2,9 @@
 #include "glArrays.h"

 #include <GL/glew.h>

 #include <cache.h>

+#include <fcntl.h>

 #include <gfx/image.h>

+#include <glm/geometric.hpp>

 #include <resource.h>

 #include <stb/stb_image.h>

 

@@ -36,3 +38,28 @@ Texture::bind(GLenum unit) const
 	glActiveTexture(unit);

 	glBindTexture(GL_TEXTURE_2D, m_texture);

 }

+

+void

+Texture::save(const glTexture & texture, const glm::ivec2 & size, const char * path)

+{

+	GLint drawFboId = 0, readFboId = 0;

+	glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &drawFboId);

+	glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &readFboId);

+	std::vector<unsigned char> buffer(static_cast<size_t>(size.x * size.y * 3));

+	{

+		glFrameBuffer tmp;

+		glBindFramebuffer(GL_FRAMEBUFFER, tmp);

+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);

+		glReadPixels(0, 0, size.x, size.y, GL_BGR, GL_UNSIGNED_BYTE, buffer.data());

+	}

+	{

+		auto out = open(path, O_WRONLY | O_CREAT, 0660);

+		short TGAhead[] = {0, 2, 0, 0, 0, 0, static_cast<short>(size.x), static_cast<short>(size.y), 24};

+		std::ignore = write(out, &TGAhead, sizeof(TGAhead));

+		std::ignore = write(out, buffer.data(), buffer.size());

+		std::ignore = ftruncate(out, static_cast<off_t>(buffer.size() + sizeof(TGAhead)));

+		close(out);

+	}

+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, static_cast<GLuint>(drawFboId));

+	glBindFramebuffer(GL_READ_FRAMEBUFFER, static_cast<GLuint>(readFboId));

+}

diff --git a/gfx/models/texture.h b/gfx/models/texture.h
index 2bbf1f4..09538b3 100644
--- a/gfx/models/texture.h
+++ b/gfx/models/texture.h
@@ -3,6 +3,7 @@
 #include <cache.h>

 #include <filesystem>

 #include <glArrays.h>

+#include <glm/fwd.hpp>

 

 // IWYU pragma: no_forward_declare Cache

 class Image;

@@ -17,6 +18,8 @@ public:
 

 	void bind(GLenum unit = GL_TEXTURE0) const;

 

+	static void save(const glTexture &, const glm::ivec2 & size, const char * path);

+

 private:

 	glTexture m_texture;

 };