opengl_x11

commit 646ba013c9b55efd0daebd002da96b2abea20300
parent ba3c7a0c3acccabaeccc09545d8b4d3edeb7c262
Author: bsandro <email@bsandro.tech>
Date:   Sat,  8 Nov 2025 11:24:27 +0200

Fix for flipped image, Hina is being rendered finally

Diffstat:
M
Makefile
 | 
2
+-
M
hina.png
 | 
0

M
texture.c
 | 
3
++-

3 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,6 +1,6 @@
 .SUFFIXES:
 MAKEFLAGS+=-rR
-CFLAGS=-std=gnu23 -Wpedantic -Os -s -fomit-frame-pointer -ffast-math -fno-stack-protector -march=native -fwrapv -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables -fmerge-all-constants -fno-ident
+CFLAGS=-std=gnu23 -Wpedantic -Wunused -Os -s -fomit-frame-pointer -ffast-math -fno-stack-protector -march=native -fwrapv -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables -fmerge-all-constants -fno-ident
 LDFLAGS=-lm -lGL -lGLU -lX11 -Wl,--gc-sections
 CC=cc
 
diff --git a/hina.png b/hina.png
Binary files differ.
diff --git a/texture.c b/texture.c
@@ -85,6 +85,7 @@ static GLuint mkTexture(const char *filename) {
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     int w, h, numchan;
+    stbi_set_flip_vertically_on_load(1);
     unsigned char *data = stbi_load(filename, &w, &h, &numchan, 0);
     if (data) {
         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
@@ -173,7 +174,7 @@ int main(int argc, char *argv[]) {
     printf("shader link status: %s\n", prgStatus == GL_TRUE ? "ok" : "error");
 
     // texture
-    GLuint tex = mkTexture("icon2.png");
+    GLuint tex = mkTexture("hina1.png");
     GLint position = glGetAttribLocation(shaderPrg, "position");
     glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), (void *)0);
     glEnableVertexAttribArray(position);