func (f *Font) DrawText2D(x int, y int, color [3]byte, scale float, txt string) (endw int, endh int) { gl.LoadIdentity() // gl.Translatef(0.0, 0.0, -2.0); glEnable2D() gl.Disable(gl.DEPTH_TEST) texture, initial, intermediarya, intermediary, w, h := f.setupTextRendering(color, txt) locX := gl.GLfloat(x) locY := gl.GLfloat(y) wi := gl.GLfloat(w) * gl.GLfloat(scale) he := gl.GLfloat(h) * gl.GLfloat(scale) /* Draw a quad at location */ gl.Begin(gl.QUADS) /* Recall that the origin is in the lower-left corner That is why the TexCoords specify different corners than the Vertex coors seem to. */ gl.TexCoord2f(0.0, 1.0) gl.Vertex2f(locX, locY) gl.TexCoord2f(1.0, 1.0) gl.Vertex2f(locX+wi, locY) gl.TexCoord2f(1.0, 0.0) gl.Vertex2f(locX+wi, locY+he) gl.TexCoord2f(0.0, 0.0) gl.Vertex2f(locX, locY+he) gl.End() endw, endh = f.teardownTextRendering(texture, initial, intermediarya, intermediary) gl.Enable(gl.DEPTH_TEST) glDisable2D() return }
func drawQuad(x, y, w, h int, u, v, u2, v2 float32) { gl.Begin(gl.QUADS) gl.TexCoord2f(float32(u), float32(v)) gl.Vertex2i(int(x), int(y)) gl.TexCoord2f(float32(u2), float32(v)) gl.Vertex2i(int(x+w), int(y)) gl.TexCoord2f(float32(u2), float32(v2)) gl.Vertex2i(int(x+w), int(y+h)) gl.TexCoord2f(float32(u), float32(v2)) gl.Vertex2i(int(x), int(y+h)) gl.End() }
func drawQuad(x, y, w, h int, u, v, u2, v2 float) { gl.Begin(gl.QUADS) gl.TexCoord2f(gl.GLfloat(u), gl.GLfloat(v)) gl.Vertex2i(gl.GLint(x), gl.GLint(y)) gl.TexCoord2f(gl.GLfloat(u2), gl.GLfloat(v)) gl.Vertex2i(gl.GLint(x+w), gl.GLint(y)) gl.TexCoord2f(gl.GLfloat(u2), gl.GLfloat(v2)) gl.Vertex2i(gl.GLint(x+w), gl.GLint(y+h)) gl.TexCoord2f(gl.GLfloat(u), gl.GLfloat(v2)) gl.Vertex2i(gl.GLint(x), gl.GLint(y+h)) gl.End() }
func (f *Font) DrawText3D(pos Vector3, color [3]byte, scale float, txt string) (endw int, endh int) { gl.LoadIdentity() // gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99)); gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99)) gl.Scalef(gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0)) gl.Disable(gl.DEPTH_TEST) texture, initial, intermediarya, intermediary, w, h := f.setupTextRendering(color, txt) wi := gl.GLfloat(w) he := gl.GLfloat(h) locX := gl.GLfloat(0) - wi*0.5 locY := gl.GLfloat(0) - he*0.5 /* Draw a quad at location */ gl.Begin(gl.QUADS) /* Recall that the origin is in the lower-left corner That is why the TexCoords specify different corners than the Vertex coors seem to. */ gl.Color4f(1.0, 1.0, 0.0, 1.0) gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(locX, locY, 0.0) gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(locX+wi, locY, 0.0) gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(locX+wi, locY+he, 0.0) gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(locX, locY+he, 0.0) gl.End() endw, endh = f.teardownTextRendering(texture, initial, intermediarya, intermediary) gl.Enable(gl.DEPTH_TEST) return }
// Here goes our drawing code func drawGLScene(sector Sector) { xtrans := gl.GLfloat(-xpos) ztrans := gl.GLfloat(-zpos) ytrans := gl.GLfloat(-walkbias - 0.25) scenroty := gl.GLfloat(360.0 - yrot) // Clear the screen and depth buffer gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // reset the view gl.LoadIdentity() // Rotate up and down to look up and down gl.Rotatef(float32(lookupdown), 1.0, 0.0, 0.0) // Rotate depending on direction player is facing gl.Rotatef(float32(scenroty), 0.0, 1.0, 0.0) // translate the scene based on player position gl.Translatef(float32(xtrans), float32(ytrans), float32(ztrans)) gl.BindTexture(gl.TEXTURE_2D, uint(textures[filter])) for _, vertices := range sector { gl.Begin(gl.TRIANGLES) for _, triangle := range *vertices { gl.Normal3f(0.0, 0.0, 1.0) gl.TexCoord2f(float32(triangle.u), float32(triangle.v)) gl.Vertex3f(float32(triangle.x), float32(triangle.y), float32(triangle.z)) } gl.End() } // Draw to the screen sdl.GL_SwapBuffers() // Gather our frames per second frames++ t := sdl.GetTicks() if t-t0 >= 5000 { seconds := (t - t0) / 1000.0 fps := frames / seconds fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS") t0 = t frames = 0 } }
// Here goes our drawing code func drawGLScene() { // Clear the screen and depth buffer gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // Move left 1.5 units and into the screen 6.0 units. gl.LoadIdentity() gl.Translatef(0.0, 0.0, -7.0) gl.Rotatef(float32(xrot), 1.0, 0.0, 0.0) /* Rotate On The X Axis */ gl.Rotatef(float32(yrot), 0.0, 1.0, 0.0) /* Rotate On The Y Axis */ gl.Rotatef(float32(zrot), 0.0, 0.0, 1.0) /* Rotate On The Z Axis */ /* Select Our Texture */ gl.BindTexture(gl.TEXTURE_2D, uint(texture)) gl.Begin(gl.QUADS) // Draw a quad /* Front Face */ gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom left gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, -1.0, 1.0) // Bottom right gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, 1.0, 1.0) // Top right gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, 1.0, 1.0) // Top left /* Back Face */ gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom right gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, 1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, 1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, -1.0, -1.0) // Bottom left /* Top Face */ gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(-1.0, 1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(-1.0, 1.0, 1.0) // Bottom left gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(1.0, 1.0, 1.0) // Bottom right gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(1.0, 1.0, -1.0) // Top right /* Bottom Face */ gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, -1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, -1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, -1.0, 1.0) // Bottom left gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right /* Right face */ gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(1.0, -1.0, -1.0) // Bottom right gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(1.0, 1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, 1.0, 1.0) // Top left gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, -1.0, 1.0) // Bottom left /* Left Face */ gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom left gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, 1.0, 1.0) // Top right gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(-1.0, 1.0, -1.0) // Top left gl.End() // done drawing the quad // Draw to the screen sdl.GL_SwapBuffers() xrot += 0.3 /* X Axis Rotation */ yrot += 0.2 /* Y Axis Rotation */ zrot += 0.4 /* Z Axis Rotation */ // Gather our frames per second frames++ t := sdl.GetTicks() if t-t0 >= 5000 { seconds := (t - t0) / 1000.0 fps := frames / seconds fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS") t0 = t frames = 0 } }
// Here goes our drawing code func drawGLScene() { // Clear the screen and depth buffer gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // Move left 1.5 units and into the screen 6.0 units. gl.LoadIdentity() gl.Translatef(0.0, 0.0, float32(z)) // translate by z gl.Rotatef(float32(xrot), 1.0, 0.0, 0.0) /* Rotate On The X Axis */ gl.Rotatef(float32(yrot), 0.0, 1.0, 0.0) /* Rotate On The Y Axis */ /* Select Our Texture */ gl.BindTexture(gl.TEXTURE_2D, uint(textures[filter])) // based on filter gl.Begin(gl.QUADS) // Front face gl.Normal3f(0.0, 0.0, 1.0) // Normal Pointing Towards Viewer gl.TexCoord2f(0.0, 1.0); gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom left gl.TexCoord2f(1.0, 1.0); gl.Vertex3f( 1.0, -1.0, 1.0) // Bottom right gl.TexCoord2f(1.0, 0.0); gl.Vertex3f( 1.0, 1.0, 1.0) // Top right gl.TexCoord2f(0.0, 0.0); gl.Vertex3f(-1.0, 1.0, 1.0) // Top left // Back Face gl.Normal3f(0.0, 0.0, -1.0) // Normal Pointing Away From Viewer gl.TexCoord2f(0.0, 0.0); gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom right gl.TexCoord2f(0.0, 1.0); gl.Vertex3f(-1.0, 1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0); gl.Vertex3f( 1.0, 1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0); gl.Vertex3f( 1.0, -1.0, -1.0) // Bottom left // Top Face gl.Normal3f(0.0, 1.0, 0.0) // Normal Pointing Up gl.TexCoord2f(1.0, 1.0); gl.Vertex3f(-1.0, 1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0); gl.Vertex3f(-1.0, 1.0, 1.0) // Bottom left gl.TexCoord2f(0.0, 0.0); gl.Vertex3f( 1.0, 1.0, 1.0) // Bottom right gl.TexCoord2f(0.0, 1.0); gl.Vertex3f( 1.0, 1.0, -1.0) // Top right // Bottom Face gl.Normal3f(0.0, -1.0, 0.0) // Normal Pointing Down gl.TexCoord2f(0.0, 1.0); gl.Vertex3f(-1.0, -1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0); gl.Vertex3f( 1.0, -1.0, -1.0) // Top left gl.TexCoord2f(1.0, 0.0); gl.Vertex3f( 1.0, -1.0, 1.0) // Bottom left gl.TexCoord2f(0.0, 0.0); gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right // Right face gl.Normal3f(1.0, 0.0, 0.0) // Normal Pointing Right gl.TexCoord2f(0.0, 0.0); gl.Vertex3f(1.0, -1.0, -1.0) // Bottom right gl.TexCoord2f(0.0, 1.0); gl.Vertex3f(1.0, 1.0, -1.0) // Top right gl.TexCoord2f(1.0, 1.0); gl.Vertex3f(1.0, 1.0, 1.0) // Top left gl.TexCoord2f(1.0, 0.0); gl.Vertex3f(1.0, -1.0, 1.0) // Bottom left // Left Face gl.Normal3f(-1.0, 0.0, 0.0) // Normal Pointing Left gl.TexCoord2f(1.0, 0.0); gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom left gl.TexCoord2f(0.0, 0.0); gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right gl.TexCoord2f(0.0, 1.0); gl.Vertex3f(-1.0, 1.0, 1.0) // Top right gl.TexCoord2f(1.0, 1.0); gl.Vertex3f(-1.0, 1.0, -1.0) // Top left gl.End() sdl.GL_SwapBuffers() xrot += xspeed yrot += yspeed // Gather our frames per second frames++ t := sdl.GetTicks() if t-t0 >= 5000 { seconds := (t - t0) / 1000.0 fps := frames / seconds fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS") t0 = t frames = 0 } }
// Here goes our drawing code func drawGLScene() { // Clear the screen and depth buffer gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) gl.BindTexture(gl.TEXTURE_2D, uint(texture)) for loop, star := range stars { gl.LoadIdentity() gl.Translatef(0.0, 0.0, float32(zoom)) gl.Rotatef(float32(tilt), 1.0, 0.0, 0.0) gl.Rotatef(float32(star.angle), 0.0, 1.0, 0.0) gl.Translatef(float32(star.dist), 0.0, 0.0) gl.Rotatef(float32(-star.angle), 0.0, 1.0, 0.0) gl.Rotatef(float32(-tilt), 1.0, 0.0, 0.0) if twinkle { other := stars[(num-loop)-1] gl.Color4ub(uint8(other.r), uint8(other.g), uint8(other.b), 255) gl.Begin(gl.QUADS) gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, -1.0, 0.0) gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, -1.0, 0.0) gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, 1.0, 0.0) gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, 1.0, 0.0) gl.End() } gl.Rotatef(float32(spin), 0.0, 0.0, 1.0) gl.Color4ub(uint8(star.r), uint8(star.g), uint8(star.b), 255) gl.Begin(gl.QUADS) gl.TexCoord2f(0.0, 0.0) gl.Vertex3f(-1.0, -1.0, 0.0) gl.TexCoord2f(1.0, 0.0) gl.Vertex3f(1.0, -1.0, 0.0) gl.TexCoord2f(1.0, 1.0) gl.Vertex3f(1.0, 1.0, 0.0) gl.TexCoord2f(0.0, 1.0) gl.Vertex3f(-1.0, 1.0, 0.0) gl.End() spin += 0.01 star.angle += gl.GLfloat(loop) / gl.GLfloat(num) star.dist -= 0.01 if star.dist < 0.0 { star.dist += 5.0 star.r = gl.GLubyte(rand.Float32() * 255) star.g = gl.GLubyte(rand.Float32() * 255) star.b = gl.GLubyte(rand.Float32() * 255) } } // Draw to the screen sdl.GL_SwapBuffers() // Gather our frames per second frames++ t := sdl.GetTicks() if t-t0 >= 5000 { seconds := (t - t0) / 1000.0 fps := frames / seconds fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS") t0 = t frames = 0 } }