90 - Versuche

12 - MipMap diskret-2

 Selfhtml


Texturen laden
procedure TForm1.InitScene;
var
  pic: TPicture;
begin
  // ------------ Texture laden --------------

  pic := TPicture.Create;
  with pic do begin
//    LoadFromFile('mauer.xpm');
    LoadFromFile('project1.ico');
    glGenTextures(2, @textureID);                 // Erzeugen des Textur-Puffer.

    // --- Textur [0]
    glBindTexture(GL_TEXTURE_2D, textureID[0]);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, Width, Height, 0, GL_BGRA, GL_UNSIGNED_BYTE, Bitmap.RawImage.Data);
//    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, Width, Height, 0, GL_BGR, GL_UNSIGNED_BYTE, Bitmap.RawImage.Data);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    // --- Textur [1]
    glBindTexture(GL_TEXTURE_2D, textureID[1]);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, Width, Height, 0, GL_BGR, GL_UNSIGNED_BYTE, Bitmap.RawImage.Data);
//    glGenerateMipmap(GL_TEXTURE_2D);  //Generate num_mipmaps number of mipmaps here.


glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

//glTexParameteri( GL_TEXTURE_2D, GL_GENERATE_MIPMAP, 1) ;
    glGenerateMipmap(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, 0);
    Free; // pic
  end;

  glClearColor(0.6, 0.6, 0.4, 1.0); // Hintergrundfarbe

  // Daten für Dreieck
  glBindVertexArray(VBTriangle.VAO);
  glBindBuffer(GL_ARRAY_BUFFER, VBTriangle.VBOVertex);
  glBufferData(GL_ARRAY_BUFFER, sizeof(Quad), @Quad, GL_STATIC_DRAW);
  glEnableVertexAttribArray(0);
  glVertexAttribPointer(0, 3, GL_FLOAT, False, 0, nil);

  glBindBuffer(GL_ARRAY_BUFFER, VBTriangle.VBOTex);
  glBufferData(GL_ARRAY_BUFFER, sizeof(TextureVertex), @TextureVertex, GL_STATIC_DRAW);
  glEnableVertexAttribArray(10);
  glVertexAttribPointer(10, 2, GL_FLOAT, False, 0, nil);
end;

Vertex-Shader:

Hier ist die Uniform-Variable mat hinzugekommen.
Diese wird im Vertex-Shader deklariert, Bewegungen kommen immer in diesen Shader.
#version 330

layout (location = 0) in vec3 inPos; // Vertex-Koordinaten
layout (location = 10) in vec2 inUV; // Textur-Koordinaten
uniform mat4 mat;

out vec2 UV0;

void main(void)
{
  gl_Position = mat * vec4(inPos, 1.0);
  UV0 = inUV;
}

Fragment-Shader:
#version 330

in vec2 UV0;

uniform sampler2D Sampler;

out vec4 FragColor;

void main()
{
  FragColor = texture( Sampler, UV0, -5 );
//  FragColor=vec4(1.0);
}



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