From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Sun, 10 Dec 2017 14:37:37 +0000 (+0100)
Subject: When a shader fails compilation, add some line numbers.
X-Git-Tag: 1.6.0~20
X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=0323e7512fd7e3402ca6c5da7b30ce7bb007a060

When a shader fails compilation, add some line numbers.
---

diff --git a/util.cpp b/util.cpp
index 2f6e694..9b01882 100644
--- a/util.cpp
+++ b/util.cpp
@@ -157,7 +157,19 @@ GLuint compile_shader(const string &shader_src, GLenum type)
 	GLint status;
 	glGetShaderiv(obj, GL_COMPILE_STATUS, &status);
 	if (status == GL_FALSE) {
-		fprintf(stderr, "Failed to compile shader: %s\n", shader_src.c_str());
+		// Add some line numbers to easier identify compile errors.
+		string src_with_lines = "/*   1 */ ";
+		size_t lineno = 1;
+		for (char ch : shader_src) {
+			src_with_lines.push_back(ch);
+			if (ch == '\n') {
+				char buf[32];
+				snprintf(buf, sizeof(buf), "/* %3zu */ ", ++lineno);
+				src_with_lines += buf;
+			}
+		}
+
+		fprintf(stderr, "Failed to compile shader:\n%s\n", src_with_lines.c_str());
 		exit(1);
 	}