From f92b613698b5c4066068bb937b5993b1c5a3bd24 Mon Sep 17 00:00:00 2001
From: kitty piapiac <kcp@bsd.computer>
Date: Mon, 17 Apr 2023 22:15:31 -0700
Subject: separate shader stuff from graph.c

---
 graph.c          |  37 ++++++++++---------------------------
 include/graph.h  |   6 +++++-
 mino.c           |  35 +++++++++++++++++++++++++++++++++--
 res/tex/fart.jpg | Bin 0 -> 52858 bytes
 tex.c            |   3 +--
 5 files changed, 49 insertions(+), 32 deletions(-)
 create mode 100644 res/tex/fart.jpg

diff --git a/graph.c b/graph.c
index fdc28be..92316c3 100644
--- a/graph.c
+++ b/graph.c
@@ -6,23 +6,6 @@
 #include"graph.h"
 #include"tex.h"
 
-#define GLSL(...)"#version 330 core\n"#__VA_ARGS__
-_ IM C shader_tex_vert[]=GLSL(
-  layout (location=0) in vec3 pos;
-  layout (location=1) in vec3 col;
-  layout (location=2) in vec2 tex;
-  out vec3 Col;
-  out vec2 Tex;
-  void main(){gl_Position=vec4(pos,1.0);Col=col;Tex=tex;});
-
-_ IM C shader_tex_frag[]=GLSL(
-  out vec4 Frag;
-  in vec3 Col;
-  in vec2 Tex;
-  uniform sampler2D tex_buf;
-  void main(){Frag=texture(tex_buf,Tex);});
-
-U32 graph_shader_tex;
 U32 graph_win_w=1280,graph_win_h=720;
 
 _ SDL_Window*win;
@@ -40,8 +23,7 @@ V graph_init(V){SDL_version sdl_vh,sdl_vl;
   N(ctx=SDL_GL_CreateContext(win),on_err("create OpenGL context"))
   N(gladLoadGLLoader(SDL_GL_GetProcAddress),on_err("load GL"))
   SDL_GL_SetSwapInterval(1);
-  q_init(),
-  graph_shader_tex=graph_shader_create(shader_tex_vert,shader_tex_frag);
+  q_init();
   SDL_VERSION(&sdl_vh)SDL_GetVersion(&sdl_vl);
   fprintf(stderr,
     "Graphics initialization successful!\n"
@@ -86,13 +68,7 @@ _ V q_init(V){
   glVertexAttribPointer(2,2,GL_FLOAT,GL_FALSE,8*SZ(F32),(V*)(6*SZ(F32))),
   glEnableVertexAttribArray(2),
   glBindVertexArray(0);}
-V graph_quad(U32 tex){//F32 t,g;I l;
-  /*t=SDL_GetTicks(),
-  g=sinf(sinf(t/255)/2)+0.5,
-  l=glGetUniformLocation(solid_shader,"col"),
-  glUniform3f(l,0,0,g),*/
-  glBindTexture(GL_TEXTURE_2D,tex),
-  glUseProgram(graph_shader_tex),
+V graph_quad(){
   glBindVertexArray(q_vao),
   glDrawElements(GL_TRIANGLES,6,GL_UNSIGNED_INT,0),
   glBindVertexArray(0);}
@@ -107,13 +83,20 @@ U32 graph_shader_create(IM C*vert,IM C*frag){I ok;C info[512];U32 v,f,p;
   glDeleteShader(v),glDeleteShader(f);
   R p;}
 
+V graph_shader_use(U32 s){glUseProgram(s);}
+V graph_shader_seti(IM C*s,I i){I p;glGetIntegerv(GL_CURRENT_PROGRAM,&p),
+  glUniform1i(glGetUniformLocation(p,s),i);}
+
 U32 graph_tex_create(IM C*f){Tex tex;U32 t;
   glGenTextures(1,&t);
   glBindTexture(GL_TEXTURE_2D,t),
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST_MIPMAP_NEAREST),
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
   tex=tex_load(f);
-  glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,tex.w,tex.h,0,GL_RGB,GL_UNSIGNED_BYTE,tex.d),
+  glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,tex.w,tex.h,0,GL_RGBA,GL_UNSIGNED_BYTE,tex.d),
   glGenerateMipmap(GL_TEXTURE_2D),
   tex_free(tex);
   R t;}
+V graph_tex_use(U32 tex,U8 i){
+  glActiveTexture(GL_TEXTURE0+i);
+  glBindTexture(GL_TEXTURE_2D,tex);}
diff --git a/include/graph.h b/include/graph.h
index d3bbbcf..61951f5 100644
--- a/include/graph.h
+++ b/include/graph.h
@@ -1,13 +1,17 @@
 #ifndef MINO_GRAPH_H
 #define MINO_GRAPH_H
+#define GRAPH_GLSL(...)"#version 330 core\n"#__VA_ARGS__
 X V graph_init(V);
 X V graph_deinit(V);
 X V graph_events(V);
 X V graph_before(V);
 X V graph_after(V);
-X V graph_quad(U32);
+X V graph_quad(V);
 X U32 graph_shader_create(IM C*,IM C*);
 X U32 graph_shader_tex;
+X V graph_shader_use(U32);
+X V graph_shader_seti(IM C*,I);
 
 X U32 graph_tex_create(IM C*);
+X V graph_tex_use(U32,U8);
 #endif
diff --git a/mino.c b/mino.c
index 2da1700..3362ab3 100644
--- a/mino.c
+++ b/mino.c
@@ -8,9 +8,40 @@ V*make(Uz z){V*p;N(p=malloc(z),   die("oom"))R p;}
 V*remk(V*p,Uz z){N(p=realloc(p,z),die("oom"))R p;}
 V del(V*p){free(p);}
 
-I main(I ac,C**av){(V)ac,(V)av;U32 cat;
+_ IM C shader_tex_vert[]=GRAPH_GLSL(
+  layout (location=0) in vec3 pos;
+  layout (location=1) in vec3 col;
+  layout (location=2) in vec2 tex;
+  out vec3 Col;
+  out vec2 Tex;
+  void main(){gl_Position=vec4(pos,1.0);Col=col;Tex=tex;});
+
+_ IM C shader_tex_frag[]=GRAPH_GLSL(
+  out vec4 Frag;
+  in vec3 Col;
+  in vec2 Tex;
+  uniform sampler2D buf0;
+  uniform sampler2D buf1;
+  void main(){Frag=texture(buf0,Tex)*texture(buf1,Tex);});
+_ U32 shader_tex;
+
+_ V shader_tex_init(V){
+  shader_tex=graph_shader_create(shader_tex_vert,shader_tex_frag),
+  graph_shader_use(shader_tex),
+  graph_shader_seti("buf0",0),
+  graph_shader_seti("buf1",1);}
+
+I main(I ac,C**av){(V)ac,(V)av;U32 cat,fart;
   graph_init();
   atexit(graph_deinit);
+
+  shader_tex_init();
   cat=graph_tex_create("res/tex/cat.jpg");
-  WH(1,graph_before(),graph_events(),graph_quad(cat),graph_after());
+  fart=graph_tex_create("res/tex/fart.jpg");
+  WH(1,graph_before(),graph_events(),
+      graph_shader_use(shader_tex),
+      graph_tex_use(cat,0),
+      graph_tex_use(fart,1),
+      graph_quad(),
+    graph_after());
   R 0;}
diff --git a/res/tex/fart.jpg b/res/tex/fart.jpg
new file mode 100644
index 0000000..44c31bc
Binary files /dev/null and b/res/tex/fart.jpg differ
diff --git a/tex.c b/tex.c
index 9523066..34b00df 100644
--- a/tex.c
+++ b/tex.c
@@ -4,7 +4,6 @@
 #include"tex.h"
 Tex tex_load(IM C*n){Tex r;U32 c;
   stbi_set_flip_vertically_on_load(1);
-  N(r.d=stbi_load(n,(S32*)&r.w,(S32*)&r.h,(S32*)&c,3),die("failed to load texture: %s\n",stbi_failure_reason()));
+  N(r.d=stbi_load(n,(S32*)&r.w,(S32*)&r.h,(S32*)&c,4),die("failed to load texture: %s\n",stbi_failure_reason()));
   R r;}
-
 V tex_free(Tex t){stbi_image_free(t.d);}
-- 
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