6 Commits

Author	SHA1	Message	Date
Elias Naur	8405bf0e47	gpu/shaders: be more robust against floating point inaccuracies ... We're forced by compatibility to encode an integer state into a floating point. Make the implicit conversion from floating point to integer more robust against GPUs with low precision floats. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-29 14:27:50 +00:00
Elias Naur	591c89ab0a	gpu: drop use of integer shader inputs ... They're a pain to support. Encode the single integer value we have as a float instead. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-27 21:22:59 +01:00
Elias Naur	c34c350a52	gpu: pack 2D transforms in vec4 values ... Instead of separate 2d scale and transform, pack them into a single 4d value. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-27 21:22:59 +01:00
Elias Naur	29d36e11ee	gpu/shaders: use correct type for integer vector ... OpenGL supports casting from int to float during vertex array reading. Direct3D doesn't. Since we're transpiling from GLSL, we can't directly use the Direct3D builtin "asint". So that leaves using "ivec2" instead of vec2. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-27 21:22:59 +01:00
Elias Naur	646a767665	gpu,gpu/gl: implement shader uniform buffers ... Emulate them for the OpenGL ES backend because 2.0 doesn't support uniform buffers. The future d3d backend only supports uniform (constant) buffers. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-27 20:34:22 +01:00
Elias Naur	ac7029fa24	gpu/internal/shaders: generate shader variants ... We're about to add Direct3D support, where shaders are written in HLSL. Rather than write shaders twice (or more), convert them to a GLSL variant understood by the glslcc cross-compiler and generate the OpenGL ES 2.0 and HLSL variants. The HLSL is used by a future change. Signed-off-by: Elias Naur <mail@eliasnaur.com>	2020-02-27 20:34:22 +01:00