Displaying an Image with OpenGL — Handmade Hero — Episode Guide

1:13win32_handmade.cpp: Disable PFD_DOUBLEBUFFER

2:04Give it a shot and see our pink window

2:33Recap our current situation

5:07Blackboard: Ways of drawing quads

6:47Blackboard: Using two triangles to draw our quadrilateral textures

7:52win32_handmade.cpp: Explain glVertex nomenclature

11:08Blackboard: Covering the screen with triangles

12:03win32_handmade.cpp: Construct our first OpenGL primitive, a triangle

13:00Run the game and "see" our triangle

14:03Blackboard: Fixed function vs programmable pipelines

16:49Blackboard: Matrix multiplication

20:06Blackboard: Homogeneous coordinates and affine transforms

24:35Blackboard: Model View and Projection matrices

26:52win32_handmade.cpp: Use glLoadIdentity to set the MODELVIEW and PROJECTION matrices to the identity matrix

28:59Run the game and see the same thing we started with

29:04Blackboard: How OpenGL does Clipping

35:04win32_handmade.cpp: Pass glVertex2i the unit cube and then 0.9f

36:11Run the game and see the smaller rectangle

36:47Blackboard: Moving from Clip space to Screen space

39:47Blackboard: Drawing a texture

40:34win32_handmade.cpp: Do glColor3f before the two trianges

42:00Blackboard: Establishing our u,v texture coordinates

42:25win32_handmade.cpp: Set our texture coordinates

44:17win32_handmade.cpp: Use glTexImage2D to submit a texture to the graphics card

57:38win32_handmade.cpp: Use glTexEnvi and glTexParameteri

1:00:16Note that we aren't yet specifying the stride

1:01:14win32_handmade.cpp: Explain these parameters

1:04:34Run the game and see that we actually are there yet

1:04:49"It's all a lie"^α

1:06:17Q&A

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1:06:17Q&A

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1:06:17Q&A

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1:06:56ratchetfreak You used static instead of local_persist for Init

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1:06:56ratchetfreak You used static instead of local_persist for Init

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1:06:56ratchetfreak You used static instead of local_persist for Init

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1:07:04win32_handmade.cpp: Introduce global_variable GLuint BlitTextureHandle

1:08:32nxsy Can we verify the vsync somehow?

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1:08:32nxsy Can we verify the vsync somehow?

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1:08:32nxsy Can we verify the vsync somehow?

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1:09:00SoysauceTheKid Are there any stretching issues when going from u,v coordinates to screen coordinates? If so, how would you fix it?

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1:09:00SoysauceTheKid Are there any stretching issues when going from u,v coordinates to screen coordinates? If so, how would you fix it?

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1:09:00SoysauceTheKid Are there any stretching issues when going from u,v coordinates to screen coordinates? If so, how would you fix it?

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1:09:53macielda The texture name you are binding is always zero after the first iteration

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1:09:53macielda The texture name you are binding is always zero after the first iteration

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1:09:53macielda The texture name you are binding is always zero after the first iteration

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1:10:18insofaras I think in old OpenGL you don't even need glGenTextures, you can just pick your own arbitrary ints

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1:10:18insofaras I think in old OpenGL you don't even need glGenTextures, you can just pick your own arbitrary ints

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1:10:18insofaras I think in old OpenGL you don't even need glGenTextures, you can just pick your own arbitrary ints

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1:10:31win32_handmade.cpp: Set GlobalBlitTextureHandle = 1; rather than using glGenTextures

1:12:51robrobby Would Texture Filtering (->GL_NEAREST) even occur when image and texture size is the same as it is now?

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1:12:51robrobby Would Texture Filtering (->GL_NEAREST) even occur when image and texture size is the same as it is now?

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1:12:51robrobby Would Texture Filtering (->GL_NEAREST) even occur when image and texture size is the same as it is now?

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1:13:39garryjohanson In your professional career what GPU library have you preferred, such as OpenGL, DirectX, GLSL, etc.? Which one do you currently use and why?

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1:13:39garryjohanson In your professional career what GPU library have you preferred, such as OpenGL, DirectX, GLSL, etc.? Which one do you currently use and why?

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1:13:39garryjohanson In your professional career what GPU library have you preferred, such as OpenGL, DirectX, GLSL, etc.? Which one do you currently use and why?

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1:14:03ChronalDragon Later on, after we upgrade to more modern OpenGL, will the game render into a framebuffer and then onto the same triangles, or will you just have it render directly to the main window buffer?

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1:14:03ChronalDragon Later on, after we upgrade to more modern OpenGL, will the game render into a framebuffer and then onto the same triangles, or will you just have it render directly to the main window buffer?

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1:14:03ChronalDragon Later on, after we upgrade to more modern OpenGL, will the game render into a framebuffer and then onto the same triangles, or will you just have it render directly to the main window buffer?

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1:15:25macielda Before you removed the Init variable and inline initialization of the texture you were always passing 0 as the name, by the way

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1:15:25macielda Before you removed the Init variable and inline initialization of the texture you were always passing 0 as the name, by the way

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1:15:25macielda Before you removed the Init variable and inline initialization of the texture you were always passing 0 as the name, by the way

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1:15:56macielda So there is no way to blit directly to the back buffer anymore?

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1:15:56macielda So there is no way to blit directly to the back buffer anymore?

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1:15:56macielda So there is no way to blit directly to the back buffer anymore?

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1:17:29robrobby Is there a difference in speed now we use OpenGL to move the buffer to the GPU?

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1:17:29robrobby Is there a difference in speed now we use OpenGL to move the buffer to the GPU?

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1:17:29robrobby Is there a difference in speed now we use OpenGL to move the buffer to the GPU?

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1:19:41garryjohanson Is there a way you know of to optimize PCI transfers between CPU and GPU using OpenGL?

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1:19:41garryjohanson Is there a way you know of to optimize PCI transfers between CPU and GPU using OpenGL?

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1:19:41garryjohanson Is there a way you know of to optimize PCI transfers between CPU and GPU using OpenGL?

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1:22:39sssmcgrath I dunno if this is applicable to the last question, I literally just got here, but glTexSubImage2D could be faster than glTexImage2D

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1:22:39sssmcgrath I dunno if this is applicable to the last question, I literally just got here, but glTexSubImage2D could be faster than glTexImage2D

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1:22:39sssmcgrath I dunno if this is applicable to the last question, I literally just got here, but glTexSubImage2D could be faster than glTexImage2D

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1:23:03Blackboard: glTexImage2D vs glTexSubImage2D

1:29:26quartertron At what point in that chain of gl commands does the card actually get involved? Command dependent? Driver dependent?

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1:29:26quartertron At what point in that chain of gl commands does the card actually get involved? Command dependent? Driver dependent?

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1:29:26quartertron At what point in that chain of gl commands does the card actually get involved? Command dependent? Driver dependent?

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1:30:02Wrap it up

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1:30:02Wrap it up

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1:30:02Wrap it up

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