[Piglit] [PATCH] glean/fbo: fix GL_LINES vertex coordinates

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

The first case had had the change already, but lacked an explanation.

See the OpenGL 4.5 Core spec, section 14.5.1, figure 14.2, page 450.
---
 tests/glean/tfbo.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/glean/tfbo.cpp b/tests/glean/tfbo.cpp
index eb66af4..3662d5d 100644
--- a/tests/glean/tfbo.cpp
+++ b/tests/glean/tfbo.cpp
@@ -607,6 +607,8 @@ FBOTest::testRender2SingleTexture(void)
                                         case GL_TEXTURE_1D:
                                                 glBegin(GL_LINES);
                                                 glVertex3f(TEXSIZE / 4, 0.5, 0.3);
+						/* + 0.25 pixels because the last line pixel
+						 * isn't drawn according to the GL spec */
                                                 glVertex3f(TEXSIZE * 5 / 8 + 0.25, 0.5, 0.3);
                                                 glEnd();
                                                 break;
@@ -637,7 +639,9 @@ FBOTest::testRender2SingleTexture(void)
                                         case GL_TEXTURE_1D:
                                                 glBegin(GL_LINES);
                                                 glVertex3f(TEXSIZE / 2, 0.5, 0.3);
-                                                glVertex3f(TEXSIZE * 7 / 8, 0.5, 0.3);
+						/* + 0.25 pixels because the last line pixel
+						 * isn't drawn according to the GL spec */
+                                                glVertex3f(TEXSIZE * 7 / 8 + 0.25, 0.5, 0.3);
                                                 glEnd();
                                                 break;
                                         case GL_TEXTURE_2D:
@@ -668,7 +672,9 @@ FBOTest::testRender2SingleTexture(void)
                                 case GL_TEXTURE_1D:
                                         glBegin(GL_LINES);
                                         glVertex3f(0, 0.5, 0.2);
-                                        glVertex3f(TEXSIZE, 0.5, 0.2);
+					/* + 0.25 pixels because the last line pixel
+					 * isn't drawn according to the GL spec */
+                                        glVertex3f(TEXSIZE + 0.25, 0.5, 0.2);
                                         glEnd();
                                         break;
                                 case GL_TEXTURE_2D:
-- 
2.7.4