add basic transforms

10 files changed, 135 insertions, 6 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 17bf14d..ea8fca3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,17 +16,19 @@ include_directories(
 	${CMAKE_SOURCE_DIR}/src
 	${LIB_ROOT}/honeysuckle/src
 	${LIB_ROOT}/glfw-3.3.8/include
+	${LIB_ROOT}/cglm/include
 )
 
+# disable byte-alignment in cglm
+add_definitions(-DCGLM_ALL_UNALIGNED)
+
 # link to third-party included libraries
 link_directories(${LIB_ROOT}/assimp/lib)
 link_directories(${LIB_ROOT}/honeysuckle)
 link_directories(${LIB_ROOT}/glfw-3.3.8/src)
 
-# add_library(glad ${SRC_ROOT}/gl/glad/glad.c)
-# add_library(stb_image src/stb_image/stb_image.c)
 add_subdirectory(${LIB_ROOT}/lua-5.1.5)
-add_subdirectory(${LIB_ROOT}/assimp)
+#add_subdirectory(${LIB_ROOT}/assimp)
 add_subdirectory(${LIB_ROOT}/honeysuckle)
 add_subdirectory(${LIB_ROOT}/cglm)
 add_subdirectory(${LIB_ROOT}/glfw-3.3.8)
@@ -35,7 +37,7 @@ add_subdirectory(${LIB_ROOT}/glfw-3.3.8)
 set(HONEY_SOURCE ${SRC_ROOT}/main.c)
 add_executable(honey ${HONEY_SOURCE})
 
-set(LIBRARIES lua5.1 honeysuckle assimp glfw)
+set(LIBRARIES lua5.1 honeysuckle glfw)
 if (WIN32)
 	set(LIBRARIES ${LIBRARIES} opengl32)
 else()
@@ -61,3 +63,4 @@ add_subdirectory(${SRC_ROOT}/logging)
 add_subdirectory(${SRC_ROOT}/image)
 add_subdirectory(${SRC_ROOT}/util)
 add_subdirectory(${SRC_ROOT}/test)
+add_subdirectory(${SRC_ROOT}/glm)
diff --git a/demo/gl-window b/demo/gl-window
deleted file mode 100644
index e69de29..0000000
--- a/demo/gl-window
+++ /dev/null
diff --git a/demo/honey.lua b/demo/honey.lua
index 3388b52..822877f 100644
--- a/demo/honey.lua
+++ b/demo/honey.lua
@@ -30,12 +30,14 @@ layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aColor;
 layout (location = 2) in vec2 aTexCoord;
 
+uniform mat4 transform;
+
 out vec3 ourColor;
 out vec2 TexCoord;
 
 void main()
 {
-    gl_Position = vec4(aPos, 1.0);
+    gl_Position = transform * vec4(aPos, 1.0);
     ourColor = aColor;
     TexCoord = aTexCoord;
 }
@@ -144,6 +146,8 @@ gl.Uniform1i(gl.GetUniformLocation(shader, 'ourTexture'), 0)
 
 --====== main loop ======--
 
+local transform = honey.glm.mat4()
+
 while not window.shouldClose(w) do
 	gl.ClearColor(0.2, 0.3, 0.3, 1.0)
 	gl.Clear(gl.COLOR_BUFFER_BIT)
@@ -152,6 +156,12 @@ while not window.shouldClose(w) do
 	gl.BindTexture(gl.TEXTURE_2D, texture)
 
 	gl.UseProgram(shader)
+	honey.glm.mat4_identity(transform)
+	local time = window.getTime()
+	honey.glm.rotate_z(transform, time, transform)
+	local transformLocation = gl.GetUniformLocation(shader, 'transform')
+	gl.UniformMatrix4fv(transformLocation, false, transform)
+
 	gl.BindVertexArray(vertexArray)
 	gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, 0)
 
diff --git a/src/gl/shader.c b/src/gl/shader.c
index b4d03e6..3732aff 100644
--- a/src/gl/shader.c
+++ b/src/gl/shader.c
@@ -18,6 +18,8 @@ int gl_uniform_get_location(lua_State *L);
 int gl_uniform_1i(lua_State *L);
 int gl_uniform_4f(lua_State *L);
 
+int gl_uniform_matrix_4fv(lua_State *L);
+
 
 void setup_shader(lua_State *L, int gl_index)
 {
@@ -37,6 +39,8 @@ void setup_shader(lua_State *L, int gl_index)
 		hs_str_cfunc("Uniform1i", gl_uniform_1i),
 		hs_str_cfunc("Uniform4f", gl_uniform_4f),
 
+		hs_str_cfunc("UniformMatrix4fv", gl_uniform_matrix_4fv),
+
 		/******** enums ********/
 		/* shader types */
 		hs_str_int("VERTEX_SHADER", GL_VERTEX_SHADER),
@@ -63,7 +67,7 @@ int gl_shader_set_source(lua_State *L)
 	lua_Integer shader;
 	char *code;
 	hs_parse_args(L, hs_int(shader), hs_str(code));
-	glShaderSource(shader, 1, &code, NULL);
+	glShaderSource(shader, 1, (const GLchar * const*)&code, NULL);
 	return 0;
 }
 
@@ -161,3 +165,16 @@ int gl_uniform_4f(lua_State *L)
 	glUniform4f(location, v0, v1, v2, v3);
 	return 0;
 }
+
+
+int gl_uniform_matrix_4fv(lua_State *L)
+{
+	lua_Integer location;
+	bool transpose;
+	void *ptr;
+	hs_parse_args(L, hs_int(location), hs_bool(transpose), hs_user(ptr));
+
+	float *value = ptr;
+	glUniformMatrix4fv(location, 1, transpose, value);
+	return 0;
+}
diff --git a/src/glm/CMakeLists.txt b/src/glm/CMakeLists.txt
new file mode 100644
index 0000000..962dbbd
--- /dev/null
+++ b/src/glm/CMakeLists.txt
@@ -0,0 +1,7 @@
+project(honey_engine)
+
+target_sources(honey PUBLIC
+	${CMAKE_CURRENT_LIST_DIR}/glm.c
+	${CMAKE_CURRENT_LIST_DIR}/mat4.c
+	${CMAKE_CURRENT_LIST_DIR}/transform.c
+)
diff --git a/src/glm/glm.c b/src/glm/glm.c
new file mode 100644
index 0000000..786fcf0
--- /dev/null
+++ b/src/glm/glm.c
@@ -0,0 +1,13 @@
+#include <lua.h>
+#include <honeysuckle.h>
+
+
+void setup_glm(lua_State *L, int honey_index)
+{
+	lua_createtable(L, 0, 1);
+	int glm_index = lua_gettop(L);
+
+	setup_mat4(L, glm_index);
+	setup_transform(L, glm_index);
+	lua_setfield(L, honey_index, "glm");
+}
diff --git a/src/glm/glm.h b/src/glm/glm.h
new file mode 100644
index 0000000..2bf803b
--- /dev/null
+++ b/src/glm/glm.h
@@ -0,0 +1,10 @@
+#ifndef HONEY_GLM_H
+#define HONEY_GLM_H
+
+#include <lua.h>
+
+void setup_glm(lua_State *L, int honey_index);
+void setup_mat4(lua_State *L, int glm_index);
+void setup_transform(lua_State *L, int glm_index);
+
+#endif
diff --git a/src/glm/mat4.c b/src/glm/mat4.c
new file mode 100644
index 0000000..f98cdfb
--- /dev/null
+++ b/src/glm/mat4.c
@@ -0,0 +1,36 @@
+#include <lua.h>
+#include <honeysuckle.h>
+#include <cglm/cglm.h>
+#include "util/util.h"
+
+int mat4_create(lua_State *L);
+int mat4_identity(lua_State *L);
+
+void setup_mat4(lua_State *L, int glm_tbl)
+{
+	int tbl = hs_create_table(L,
+		hs_str_cfunc("mat4", mat4_create),
+		hs_str_cfunc("mat4_identity", mat4_identity),
+	);
+
+	append_table(L, glm_tbl, tbl);
+	lua_pop(L, 1);
+}
+
+
+int mat4_create(lua_State *L)
+{
+	lua_newuserdata(L, 16*sizeof(float));
+	return 1;
+}
+
+
+int mat4_identity(lua_State *L)
+{
+	void *ptr;
+	hs_parse_args(L, hs_user(ptr));
+	mat4 *m = ptr;
+
+	glm_mat4_identity(*m);
+	return 0;
+}
diff --git a/src/glm/transform.c b/src/glm/transform.c
new file mode 100644
index 0000000..4dce595
--- /dev/null
+++ b/src/glm/transform.c
@@ -0,0 +1,31 @@
+#include <lua.h>
+#include <honeysuckle.h>
+#include <cglm/cglm.h>
+#include "util/util.h"
+
+
+int rotate_z(lua_State *L);
+
+
+void setup_transform(lua_State *L, int glm_tbl)
+{
+	int tbl = hs_create_table(L,
+		hs_str_cfunc("rotate_z", rotate_z),
+	);
+
+	append_table(L, glm_tbl, tbl);
+	lua_pop(L, 1);
+}
+
+
+int rotate_z(lua_State *L)
+{
+	void *src_ptr, *dest_ptr;
+	lua_Number angle;
+	hs_parse_args(L, hs_user(src_ptr), hs_num(angle), hs_user(dest_ptr));
+	mat4 *source = src_ptr;
+	mat4 *dest = dest_ptr;
+
+	glm_rotate_z(*source, angle, *dest);
+	return 0;
+}
diff --git a/src/main.c b/src/main.c
index 66b1f11..5f5d399 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,6 +4,7 @@
 #include <honeysuckle.h>
 #include "gl/gl.h"
 #include "image/image.h"
+#include "glm/glm.h"
 
 
 int main(int argc, char **argv)
@@ -16,6 +17,7 @@ int main(int argc, char **argv)
 	setup_gl(L, honey_index);
 	setup_window(L, honey_index);
 	setup_image(L, honey_index);
+	setup_glm(L, honey_index);
 	lua_setglobal(L, "honey");
 
 	int err = luaL_loadfile(L, "honey.lua");