Shader Fallback sRGB — Handmade Hero — Episode Guide

0:04Introduce our special guest, donated by quartertron: owlbot

1:31"He kinda has a USB butt"^α

4:42Run the game to recap with a few words on supporting sRGB

8:58handmade_opengl.h: Consider adding sRGBSupport to the open_gl struct

11:28win32_handmade.cpp: Try setting WGL_CONTEXT_MAJOR_VERSION_ARB to 4, run the game and find that we don't get a context

13:42handmade_opengl.cpp: Enable OpenGLInit() to call glTexImage2DMultisample() in order to check whether we support sRGB

16:58Consult docs.GL to see if we can call glDeleteTextures()¹

17:46handmade_opengl.cpp: Continue making OpenGLInit() check support for and enable an sRGB framebuffer

25:54Run the game and see that it's working

26:18Blackboard: sRGB conversions

30:32handmade_opengl.cpp: Enable OpenGLInit() to perform atomic tests on the sRGB conversions

38:06handmade_render.cpp: Look at how DrawRectangleQuickly() performs the sRGB conversions

41:22handmade_opengl.cpp: Enable the shader's FragmentCode to perform the sRGB conversion

42:47Consult the The OpenGL Shading Language 1.50 Quick Reference Card to see how to do the sqrt²

43:08handmade_opengl.cpp: Fix errors in OpenGLInit()

43:39Run the game and note that our sprite colours are sRGB correct but that the other colours are not

48:34handmade_opengl.cpp: Note that the rendering code contains duplication, and consider changing the format in which we submit textures

51:24handmade_render_group.h: Introduce textured_vertex and render_entry_textured_quads structs

56:03Blackboard: nVidia allows us to use a texture pointer in shaders

58:15handmade_render_group.h: Spec out the render_entry_textured_quads struct

59:51Blackboard: CPU vs GPU memory and mapping regions between them

1:05:25Blackboard: Using locked memory to facilitate GPU transfers

1:08:25handmade_render_group.h: Continue to spec out render_entry_textured_quads

1:11:28handmade_opengl.cpp: Enable OpenGLRenderCommands() to process textured quads

1:17:38handmade_opengl.cpp: Enable OpenGLRenderCommands() to specify the glColor4ub³

1:22:09handmade_opengl.cpp: Try sending GL_QUADS and run the game to see that it's fine

1:23:35A few words on texture atlases

1:24:47handmade_opengl.cpp: Determine to feed some sprites to OpenGLRenderCommands()

1:26:05handmade_platform.h: Make RenderCommandsStruct() take a VertexArray and consider how to write our loaded bitmaps out

1:29:26"It's high allergy season here, folks, and I'm a snotty boy"^β

1:29:32handmade_render_group.h: Add CurrentQuads to the render_group struct and introduce Begin

1:31:23handmade_render_group.cpp: Make PushBitmap() blow out the bitmap data inline

1:36:12Check out the commotion

1:37:15"It might be a protest, or it might be a parade of some kind"^γ

1:38:51quartertron Live police & fire scanner⁴

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1:38:51quartertron Live police & fire scanner⁴

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1:38:51quartertron Live police & fire scanner⁴

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1:40:11handmade_render_group.cpp: Continue working on PushBitmap()

1:44:18handmade_math.h: Introduce BGRAUnpack4x8(), BGRAPack4x8(), RGBAUnpack4x8() and RGBAPack4x8()

1:45:33handmade_render_group.cpp: Enable PushBitmap() to pack the color

1:47:05handmade_platform.h: Make RenderCommandsStruct() take a VertexCount

1:48:07handmade_render_group.cpp: Enable PushBitmap() to write out the vertices and the render entry for the quads

1:53:50Run the game to see that it is not exactly a stunning success, and investigate why we're not seeing the textures

1:55:45Step in to OpenGLRenderCommands() and inspect the Bitmap and Vertex values

1:56:41handmade_math.h: Make PushBitmap() multiply by 255 before passing the PremulColor to RGBAPack4x8()

1:57:29Run the game to see some pretty good texture stretching

1:57:42handmade_render_group.cpp: Make PushBitmap() set the axes correctly, and run the game to admire it

1:58:19Q&A

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1:58:19Q&A

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1:58:19Q&A

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1:58:40desuused Emulating sRGB texture loads and sRGB fragment writes is not enough: sRGB also affects blending, which you can't emulate

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1:58:40desuused Emulating sRGB texture loads and sRGB fragment writes is not enough: sRGB also affects blending, which you can't emulate

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1:58:40desuused Emulating sRGB texture loads and sRGB fragment writes is not enough: sRGB also affects blending, which you can't emulate

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2:01:07zilarrezko Do you have a licence for all those cubes?

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2:01:07zilarrezko Do you have a licence for all those cubes?

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2:01:07zilarrezko Do you have a licence for all those cubes?

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2:01:17rooctag What texture will you use for rects and cubes?

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2:01:17rooctag What texture will you use for rects and cubes?

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2:01:17rooctag What texture will you use for rects and cubes?

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2:01:52mtsmox Is it worth testing sRGB and MSAA in the non-OpenGL compatibility mode?

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2:01:52mtsmox Is it worth testing sRGB and MSAA in the non-OpenGL compatibility mode?

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2:01:52mtsmox Is it worth testing sRGB and MSAA in the non-OpenGL compatibility mode?

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2:03:07Jim0_o Will you be using more than one ShaderProgram? If so, how do you minimize switching between programs when rendering?

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2:03:07Jim0_o Will you be using more than one ShaderProgram? If so, how do you minimize switching between programs when rendering?

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2:03:07Jim0_o Will you be using more than one ShaderProgram? If so, how do you minimize switching between programs when rendering?

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2:04:20mtsmox You could unset it and just see if the assert will fail?

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2:04:20mtsmox You could unset it and just see if the assert will fail?

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2:04:20mtsmox You could unset it and just see if the assert will fail?

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2:05:18win32_handmade.cpp: Research WGL_CONTEXT_PROFILE_MASK_ARB and specify the CORE_PROFILE in Win32OpenGLAttribs⁵

2:06:09Run the game and see that it unexpectedly works, then step through OpenGLInit() to see that it still errors out

2:07:55insofaras Are you passing a major / minor version too? I think the bit might not be enabled sub 3.2?

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2:07:55insofaras Are you passing a major / minor version too? I think the bit might not be enabled sub 3.2?

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2:07:55insofaras Are you passing a major / minor version too? I think the bit might not be enabled sub 3.2?

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2:09:36Wind this down with the promise of a question for insofaras and a mention of daylight savings time

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2:09:36Wind this down with the promise of a question for insofaras and a mention of daylight savings time

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2:09:36Wind this down with the promise of a question for insofaras and a mention of daylight savings time

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