From 98e844f27d7d84ef823c822d11306c17210cb5c4 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 18 Nov 2022 20:24:48 +0000
Subject: Simplified texture save

Read directly from texture into file buffer, no temporary framebuffer
---
 gfx/models/texture.cpp | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

(limited to 'gfx/models')

diff --git a/gfx/models/texture.cpp b/gfx/models/texture.cpp
index ab1a5fe..313b3fa 100644
--- a/gfx/models/texture.cpp
+++ b/gfx/models/texture.cpp
@@ -43,24 +43,13 @@ Texture::bind(GLenum unit) const
 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));
+	glGetTextureImage(texture, 0, GL_BGR, GL_UNSIGNED_BYTE, static_cast<GLsizei>(buffer.size()), 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);
 }
-- 
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