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render little thumbnails for each loaded image

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This commit is contained in:
Colin McMillen 2023-06-29 22:09:08 -04:00
parent 6fc66aba8f
commit 225a1a623c
1 changed files with 51 additions and 7 deletions
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58
Program.cs
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@ -221,18 +221,18 @@ public class Game : GameWindow {
protected override void OnLoad() {
base.OnLoad();
GL.ClearColor(0.2f, 0.3f, 0.3f, 1.0f);
GL.ClearColor(0.0f, 0.0f, 0.05f, 1.0f);
VertexArrayObject = GL.GenVertexArray();
GL.BindVertexArray(VertexArrayObject);
VertexBufferObject = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBufferObject);
GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.StaticDraw);
ElementBufferObject = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBufferObject);
GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.DynamicDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, ElementBufferObject);
GL.BufferData(BufferTarget.ElementArrayBuffer, indices.Length * sizeof(uint), indices, BufferUsageHint.StaticDraw);
GL.BufferData(BufferTarget.ElementArrayBuffer, indices.Length * sizeof(uint), indices, BufferUsageHint.DynamicDraw);
shader = new Shader();
shader.Use();
@ -257,7 +257,7 @@ public class Game : GameWindow {
foreach (string file in files) {
if (file.ToLower().EndsWith(".jpg")) {
textures.Add(new Texture(file));
}
}
}
}
@ -269,11 +269,25 @@ public class Game : GameWindow {
base.OnRenderFrame(e);
frameCount++;
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.BindVertexArray(VertexArrayObject);
SetVertices(0, 0, windowWidth - 152, windowHeight);
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBufferObject);
GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.DynamicDraw);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, textures[textureIndex].Handle);
shader.Use();
GL.DrawElements(PrimitiveType.Triangles, indices.Length, DrawElementsType.UnsignedInt, 0);
for (int i = 0; i < textures.Count; i++) {
SetVertices(windowWidth - 150, i * 100, windowWidth, i * 100 + 98);
GL.BindBuffer(BufferTarget.ArrayBuffer, VertexBufferObject);
GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.DynamicDraw);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, textures[i].Handle);
shader.Use();
GL.DrawElements(PrimitiveType.Triangles, indices.Length, DrawElementsType.UnsignedInt, 0);
}
SwapBuffers();
}
@ -287,6 +301,36 @@ public class Game : GameWindow {
GL.UniformMatrix4(shader.GetUniformLocation("projection"), true, ref projection);
GL.Viewport(0, 0, windowWidth, windowHeight);
}
private void SetVertices(float left, float top, float right, float bottom) {
// top left
vertices[0] = left;
vertices[1] = top;
vertices[2] = 0f;
vertices[3] = 0f;
vertices[4] = 0f;
// top right
vertices[5] = right;
vertices[6] = top;
vertices[7] = 0f;
vertices[8] = 1f;
vertices[9] = 0f;
// bottom right
vertices[10] = right;
vertices[11] = bottom;
vertices[12] = 0f;
vertices[13] = 1f;
vertices[14] = 1f;
// bottom left
vertices[15] = left;
vertices[16] = bottom;
vertices[17] = 0f;
vertices[18] = 0f;
vertices[19] = 1f;
}
}
static class Program {