main: draw mesh from binary vertex/index buffers

main.lua

@@ -17,14 +17,21 @@ local vertexcode = [[
     #pragma language glsl3
 
     layout (location = 0) in vec4 VertexPosition;
-    layout (location = 1) in vec4 VertexColor;
+    layout (location = 1) in vec4 VertexNormal;
+    layout (location = 2) in vec4 VertexTexture;
+
+    uniform mat4 projection;
+    uniform mat4 view;
+    uniform mat4 model;
+    uniform mat4 model2;
 
     varying vec4 PixelColor;
 
     void vertexmain()
     {
-        PixelColor = VertexColor;
-        love_Position = TransformProjectionMatrix * VertexPosition;
+        PixelColor = VertexNormal * 0.5 + 0.5;
+        mat4 trans = projection * view * model * model2;
+        love_Position = trans * vec4(VertexPosition.xyz, 1);
     }
 ]]
 
@@ -32,53 +39,120 @@ local shader = love.graphics.newShader(pixelcode, vertexcode)
 
 local vertexformat = {
    { name = 'VertexPosition', format = 'floatvec3', location = 0 },
-   { name = 'VertexColor', format = 'floatvec3', location = 1 },      
+   { name = 'VertexNormal', format = 'floatvec3', location = 1 },
+   { name = 'VertexTexture', format = 'floatvec3', location = 2 },
 }
 
-local vertexdata = {
-   -0.5, -0.5, -0.5, 1, 0, 0, -- tl \|
-    0.5, -0.5, -0.5, 0, 1, 0, -- tr
-    0.5,  0.5, -0.5, 0, 0, 1, -- br
-    -0.5, 0.5, -0.5, 1, 1, 1, -- bl |\
-}
+local rotation
 
-local indexdata = {
-   0, 1, 2,
-   0, 3, 2,
-};
+function look_at()
+   local m = {
+      1.000000, 0.000000, 0.000000, 0.000000,
+      0.000000, 1.000000, 0.000000, 0.000000,
+      0.000000, 0.000000, 1.000000, -2.000000,
+      0.000000, 0.000000, 0.000000, 1.000000,
+   }
+
+   return m;
+end
+
+function projection()
+   local m = {
+      1.000000, 0.000000, 0.000000, 0.000000,
+      0.000000, 1.000000, 0.000000, 0.000000,
+      0.000000, 0.000000, -1.002002, -0.200200,
+      0.000000, 0.000000, -1.000000, 0.000000,
+   }
+   return m
+end
 
 function love.load(args)
+   love.window.setMode(600, 600, {depth=true})
+
+   local vertexdata = love.filesystem.newFileData("position_normal_texture.vtx")
+   local indexdata = love.filesystem.newFileData("index.idx")
+
    local vertexbuffer = love.graphics.newBuffer(vertexformat, vertexdata, { vertex = true, usage = "static" })
-   local indexbuffer = love.graphics.newBuffer("uint16", indexdata, { index = true, usage = "static" })   
-   
+   local indexbuffer = love.graphics.newBuffer("uint32", indexdata, { index = true, usage = "static" })
+
    attributelist = {
       {
-	 buffer = vertexbuffer,
-	 location = 0,
-	 name = "VertexPosition", -- the name this vertex attribute will use in a shader
-	 nameinbuffer = nil, -- the name of the attribute in the vertex buffer. Defaults to the name field.
-	 step = "pervertex", -- vertex attribute step ("pervertex" or "perinstance"), defaults to "pervertex".
-	 startindex = 1, -- 1-based array index within the given vertex buffer where the attribute data will start being pulled from during rendering. Defaults to 1.
+         buffer = vertexbuffer,
+         location = 0,
+         name = "VertexPosition", -- the name this vertex attribute will use in a shader
+         nameinbuffer = nil, -- the name of the attribute in the vertex buffer. Defaults to the name field.
+         step = "pervertex", -- vertex attribute step ("pervertex" or "perinstance"), defaults to "pervertex".
+         startindex = 1, -- 1-based array index within the given vertex buffer where the attribute data will start being pulled from during rendering. Defaults to 1.
+      },
+{
+         buffer = vertexbuffer,
+         location = 1,
+         name = "VertexNormal", -- the name this vertex attribute will use in a shader
+         nameinbuffer = nil, -- the name of the attribute in the vertex buffer. Defaults to the name field.
+         step = "pervertex", -- vertex attribute step ("pervertex" or "perinstance"), defaults to "pervertex".
+         startindex = 1, -- 1-based array index within the given vertex buffer where the attribute data will start being pulled from during rendering. Defaults to 1.
       },
       {
-	 buffer = vertexbuffer,
-	 location = 1,
-	 name = "VertexColor", -- the name this vertex attribute will use in a shader
-	 nameinbuffer = nil, -- the name of the attribute in the vertex buffer. Defaults to the name field.
-	 step = "pervertex", -- vertex attribute step ("pervertex" or "perinstance"), defaults to "pervertex".
-	 startindex = 1, -- 1-based array index within the given vertex buffer where the attribute data will start being pulled from during rendering. Defaults to 1.
+         buffer = vertexbuffer,
+         location = 2,
+         name = "VertexTexture", -- the name this vertex attribute will use in a shader
+         nameinbuffer = nil, -- the name of the attribute in the vertex buffer. Defaults to the name field.
+         step = "pervertex", -- vertex attribute step ("pervertex" or "perinstance"), defaults to "pervertex".
+         startindex = 1, -- 1-based array index within the given vertex buffer where the attribute data will start being pulled from during rendering. Defaults to 1.
       },
    }
    drawmode = "triangles"
-   
+
    mesh = love.graphics.newMesh(attributelist, drawmode)
    mesh:setIndexBuffer(indexbuffer)
 end
 
-function love.draw()   
-   local radius = 100   
+local rotation = 0.0
+
+function rotate_x(t)
+   local cos = math.cos
+   local sin = math.sin
+   return {
+      1, 0, 0, 0,
+      0, cos(t), -sin(t), 0,
+      0, sin(t), cos(t), 0,
+      0, 0, 0, 1
+   }
+end
+
+function rotate_y(t)
+   local cos = math.cos
+   local sin = math.sin
+   return {
+      cos(t), 0, sin(t), 0,
+      0, 1, 0, 0,
+      -sin(t), 0, cos(t), 0,
+      0, 0, 0, 1
+   }
+end
+
+function rotate_z(t)
+   local cos = math.cos
+   local sin = math.sin
+   return {
+      cos(t), -sin(t), 0, 0,
+      sin(t), cos(t), 0, 0,
+      0, 0, 1, 0,
+      0, 0, 0, 1
+   }
+end
+
+
+function love.draw()
+   local radius = 100
    local mx, my = love.mouse.getPosition()
 
-   love.graphics.setShader(shader)   
-   love.graphics.draw(mesh, mx, my, 0, radius, radius)   
+   shader:send("projection", projection(1, 1))
+   shader:send("view", look_at())
+   shader:send("model", rotate_x(rotation))
+   shader:send("model2", rotate_z(rotation * 0.5))
+   rotation = rotation + 0.01
+   love.graphics.setShader(shader)
+   love.graphics.setDepthMode("less", true)
+   love.graphics.draw(mesh, mx, my, 0, radius, radius)
 end