glm: matrix multiplication; docs: toc

doc/docs.md

@@ -18,10 +18,52 @@ you can do in V.
 
 <table>
 	<tr>
-		<td><a href='#hello-world'>1. Hello world</a></td>
+		<td><a href='#hello-world'>Hello world</a></td>
-		<td><a href='#comments'>2. Comments</a></td>
+		<td><a href='#comments'>Comments</a></td>
-		<td><a href='#functions'>3. Functions</a></td>
+		<td><a href='#functions'>Functions</a></td>
-		<td><a href='#'>TODO</a></td>
+		<td><a href='#constants--variables'>Constants & variables</a></td>
+		<td><a href='#primitive-types'>Primitive types</a></td>
+		<td><a href='#strings'>Strings</a></td>
+		<td><a href='#imports'>Imports</a></td>
+		<td><a href='#arrays'>Arrays</a></td>
+		<td><a href='#maps'>Maps</a></td>
+		<td><a href='#if'>If</a></td>
+		<td><a href='#in-operator'>In Operator</a></td>
+		<td><a href='#for-loop'>For loop</a></td>
+		<td><a href='#match'>Match</a></td>
+		<td><a href='#structs'>Structs</a></td>
+		<td><a href='#access-modifiers'>Access modifiers</a></td>
+		<td><a href='#methods'>Methods</a></td>
+		<td><a href='#pure-functions-by-default'>Pure functions by default</a></td>
+		<td><a href='#anonymous--high-order-functions'>Anonymous & high order functions</a></td>
+		<td><a href='#references'>References</a></td>
+		<td><a href='#constants'>Constants</a></td>
+		<td><a href='#println'>println</a></td>
+		<td><a href='#modules'>Modules</a></td>
+		<td><a href='#interfaces'>Interfaces</a></td>
+		<td><a href='#enums'>Enums</a></td>
+		<td><a href='#sum-types'>Sum types</a></td>
+		<td><a href='#optionresult-types-and-error-handtdng'>Option/Result types and error handtdng</a></td>
+		<td><a href='#generics'>Generics</a></td>
+		<td><a href='#concurrency'>Concurrency</a></td>
+		<td><a href='#decoding-json'>Decoding JSON</a></td>
+		<td><a href='#testing'>Testing</a></td>
+		<td><a href='#memory-management'>Memory managment</a></td>
+		<td><a href='#defer'>Defer</a></td>
+		<td><a href='#orm'>ORM</a></td>
+		<td><a href='#vfmt'>vfmt</a></td>
+		<td><a href='#writing-documentation'>Writing documentation</a></td>
+		<td><a href='caltdng-c-functions-from-v'>Caltdng C functions from V</a></td>
+		<td><a href='conditional-compilation'>Conditional compilation</a></td>
+		<td><a href='reflection-via-codegen'>Reflection via codegen</a></td>
+		<td><a href='tdmited-operator-overloading'>tdmited operator overloading</a></td>
+		<td><a href='intdne-assembly'>Intdne assembly</a></td>
+		<td><a href='translating-cc-to-v'>Translating C/C++ to V</a></td>
+		<td><a href='hot-code-reloading'>Hot code reloading</a></td>
+		<td><a href='cross-compilation'>Cross compilation</a></td>
+		<td><a href='cross-platform-shell-scripts-in-v'>Cross-platform shell scripts in V</a></td>
+		<td><a href='appendix-i-keywords'>Appendix I: Keywords</a></td>
+		<td><a href='appendix-ii-keywords'>Appendix II: Operators</a></td>
 	</tr>
 </table>
 

vlib/gl/1shader.v

@@ -179,7 +179,6 @@ pub fn (s Shader) use() {
 	gl.use_program(s.program_id)
 }
 
-fn C.glGetUniformLocation() int
 fn C.glUniformMatrix4fv()
 fn C.glUniform1i()
 fn C.glUniform3f()

vlib/gl/gl.v

@@ -4,10 +4,13 @@
 
 module gl
 
+import glm
+
 #flag  -I @VROOT/thirdparty/glad
 #include "glad.h"
 #flag @VROOT/thirdparty/glad/glad.o
 
+
 // joe-c: fix & remove
 pub enum TmpGlImportHack{ non_empty }
 
@@ -51,6 +54,8 @@ fn C.glPixelStorei()
 fn C.glBlendFunc()
 fn C.glPolygonMode()
 fn C.glDeleteBuffers()
+fn C.glGetUniformLocation() int
+fn C.glGetAttribLocation() int
 
 
 pub fn init_glad() {
@@ -181,6 +186,17 @@ pub fn set_ebo(ebo u32, indices []int, draw_typ int) {
 // fn gen_vertex_arrays(a int, vao uint) {
 // # glGenVertexArrays(a, &VAO);
 // }
+
+// gets the uniform location for key
+pub fn get_uniform_location(program int, key string) int {
+	return C.glGetUniformLocation(program, key.str)
+}
+
+//gets the attribute location for key
+pub fn get_attrib_location(program int, key string) int {
+	return C.glGetAttribLocation(program, key.str)
+}
+
 pub fn draw_arrays(typ, start, len int) {
 	C.glDrawArrays(typ, start, len)
 }
@@ -239,3 +255,7 @@ pub fn generate_mipmap(typ int) {
 	C.glGenerateMipmap(typ)
 }
 
+// set mat4 at uniform location
+pub fn set_mat4fv(loc, count int, transpose bool, val glm.Mat4) {
+	C.glUniformMatrix4fv(loc, count, transpose, val.data)
+}

vlib/glm/glm.v

@@ -175,6 +175,22 @@ pub fn ortho(left, right, bottom, top f32) Mat4 {
 	return mat4(res)
 }
 
+// https://github.com/g-truc/glm/blob/0ceb2b755fb155d593854aefe3e45d416ce153a4/glm/ext/matrix_clip_space.inl
+pub fn ortho_zo(left, right, bottom, top, zNear, zFar f32) Mat4 {
+	//println('glm ortho($left, $right, $bottom, $top)')
+	// mat<4, 4, T, defaultp> Result(static_cast<T>(1));
+	n := 16
+	mut res := f32_calloc(n)
+	res[0] = 2.0 / (right - left)
+	res[5] = 2.0 / (top - bottom)
+	res[10] = 1.0
+	res[12] = - (right + left) / (right - left)
+	res[13] = - (top + bottom) / (top - bottom)
+	res[14] = - zNear / (zFar - zNear)
+	res[15] = 1.0
+	return mat4(res)
+}
+
 // fn scale(a *f32, v Vec3) *f32 {
 pub fn scale(m Mat4, v Vec3) Mat4 {
 	a := m.data
@@ -201,6 +217,62 @@ pub fn scale(m Mat4, v Vec3) Mat4 {
 	return mat4(out)
 }
 
+// multiplicates two matrices
+pub fn mult(a, b Mat4) Mat4 {
+	da := a.data
+	db := b.data
+	mut out := f32_calloc(16)
+	mut row0 := f32_calloc(4)
+	mut row1 := f32_calloc(4)
+	mut row2 := f32_calloc(4)
+	mut row3 := f32_calloc(4)
+
+	row0[0] = db[0]row0[1] = db[1]row0[2] = db[2]row0[3] = db[3]
+	row1[0] = db[4]row1[1] = db[5]row1[2] = db[6]row1[3] = db[7]
+	row2[0] = db[8]row2[1] = db[9]row2[2] = db[10]row2[3] = db[11]
+	row3[0] = db[12]row3[1] = db[13]row3[2] = db[14]row3[3] = db[15]
+
+	a_ := mult_mat_point(a, mat4(row0))
+	b_ := mult_mat_point(a, mat4(row1))
+	c_ := mult_mat_point(a, mat4(row2))
+	d_ := mult_mat_point(a, mat4(row3))
+
+	res0 := a_.data res1 := b_.data res2 := c_.data res3 := d_.data
+
+	out[0] = res0[0] out[1] = res0[1] out[2] = res0[2] out[3] = res0[3]
+	out[4] = res1[0] out[5] = res1[1] out[6] = res1[2] out[7] = res1[3]
+	out[8] = res2[0] out[9] = res2[1] out[10] = res2[2] out[11] = res2[3]
+	out[12] = res3[0] out[13] = res3[1] out[14] = res3[2] out[15] = res3[3]
+
+	return mat4(out)
+}
+
+// helper function for mult
+fn mult_mat_point(a Mat4, point Mat4) Mat4 {
+	data := a.data
+	c0r0 := data[0]c1r0 := data[1]c2r0 := data[2]c3r0 := data[3]
+	c0r1 := data[4]c1r1 := data[5]c2r1 := data[6]c3r1 := data[7]
+	c0r2 := data[8]c1r2 := data[9]c2r2 := data[10]c3r2 := data[11]
+	c0r3 := data[12]c1r3 := data[13]c2r3 := data[14]c3r3 := data[15]
+
+	pdata := point.data
+	x := pdata[0]
+	y := pdata[1]
+	z := pdata[2]
+	w := pdata[3]
+
+	mut out := f32_calloc(4)
+
+	rx := (x * c0r0) + (y * c0r1) + (z * c0r2) + (w * c0r3)
+	ry := (x * c1r0) + (y * c1r1) + (z * c1r2) + (w * c1r3)
+	rz := (x * c2r0) + (y * c2r1) + (z * c2r2) + (w * c2r3)
+	rw := (x * c3r0) + (y * c3r1) + (z * c3r2) + (w * c3r3)
+
+	out[0] = rx out[1] = ry	out[2] = rz out[3] = rw
+
+	return mat4(out)
+}
+
 // fn rotate_z(a *f32, rad f32) *f32 {
 pub fn rotate_z(m Mat4, rad f32) Mat4 {
 	a := m.data

vlib/glm/glm_test.v

@@ -82,3 +82,13 @@ fn test_translate() {
 	// (0.000000, 0.000000, -0.500000, 1.000000))
 }
 
+fn test_mult() {
+	//TODO improve test
+	mut a := glm.identity()
+	mut b := glm.identity()
+	mut c := glm.identity()
+	a = glm.mult(a, b)
+	for i in 0..15 {
+		assert a.data[i] == c.data[i]
+	}
+}