From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Tue, 2 Oct 2012 09:48:34 +0000 (+0200)
Subject: Use glTexSubImage2D on second and later uploads.
X-Git-Tag: 1.0~435
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=2e4309fd8af9ca0a3656a584f8ed8b3fc634263f

Use glTexSubImage2D on second and later uploads.
---

diff --git a/effect_chain.cpp b/effect_chain.cpp
index 85832db..0f2e69d 100644
--- a/effect_chain.cpp
+++ b/effect_chain.cpp
@@ -213,7 +213,12 @@ void EffectChain::render_to_screen(unsigned char *src)
 		assert(false);
 	}
 
-	glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, src);
+	static bool first = true;
+	if (first) {
+		glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, src);
+	} else {
+		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, src);
+	}
 	check_error();
 	glUniform1i(glGetUniformLocation(glsl_program_num, "input_tex"), 0);