Allow multiple shaders while reducing duplication

This change also stops using bie as eventually it will be replaced with
a more sophisticated asset handling system which will also allow custom
shaders.

3 files changed, 79 insertions, 0 deletions

diff --git a/shaders/data.h b/shaders/data.h
new file mode 100644
index 0000000..e1a71c3
--- /dev/null
+++ b/shaders/data.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
+ * SPDX-License-Identifier: MIT
+ */
+#ifdef SH_PROG
+	SH_PROG(main)
+#undef SH_PROG
+#endif // SH_PROG
+#ifdef SH_VER
+	SH_VER("330 core")
+#undef SH_VER
+#endif // SH_VER
+#ifdef SH_IN
+	SH_IN(vec3, pos)
+	SH_IN(vec3, norm)
+	SH_IN(vec2, uv)
+#undef SH_IN
+#endif // SH_IN
+#ifdef SH_UNI
+	SH_UNI(mat4, model)
+	SH_UNI(mat4, view)
+	SH_UNI(mat4, proj)
+	SH_UNI(vec3, light)
+#undef SH_UNI
+#endif // SH_UNI
+#ifdef SH_TEX
+	SH_TEX(2D, tex)
+#undef SH_TEX
+#endif // SH_TEX
+#ifdef SH_OUT
+	SH_OUT(vec4, color)
+#undef SH_OUT
+#endif // SH_OUT
diff --git a/shaders/main/frag.glsl b/shaders/main/frag.glsl
new file mode 100644
index 0000000..c57598c
--- /dev/null
+++ b/shaders/main/frag.glsl
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
+ * SPDX-License-Identifier: MIT
+ */
+in vec3 fnorm;
+in vec3 fpos;
+in vec2 fuv;
+in vec3 lipos;
+
+void main()
+{
+	vec3 objco = vec3(texture(tex, fuv));
+	vec3 lico = vec3(1.0, 1.0, 1.0);
+
+	float amb = 0.1;
+
+	vec3 norm = normalize(fnorm);
+	vec3 lidir = normalize(lipos - fpos);
+	float dif = max(dot(norm, lidir), 0.0);
+
+	float speen = max(sign(dot(lidir, norm)), 0.0);
+	vec3 vwdir = normalize(-fpos);
+	vec3 mid = normalize(lidir + vwdir);
+
+	float spe = pow(max(dot(norm, mid), 0.0), 256) * speen;
+
+	color = vec4((amb + dif + spe) * lico * objco, 1.0);
+}
diff --git a/shaders/main/vert.glsl b/shaders/main/vert.glsl
new file mode 100644
index 0000000..f710067
--- /dev/null
+++ b/shaders/main/vert.glsl
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
+ * SPDX-License-Identifier: MIT
+ */
+out vec3 fnorm;
+out vec3 fpos;
+out vec2 fuv;
+out vec3 lipos;
+
+void main()
+{
+	gl_Position = proj * view * model * vec4(pos, 1.0);
+	fpos = vec3(view * model * vec4(pos, 1.0));
+	fuv = uv;
+	// TODO: Try to work out how to only do this ONCE in C or see if it matters
+	fnorm = mat3(transpose(inverse(view * model))) *norm;
+	lipos = vec3(view * vec4(light, 1.0));
+}