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Do the transform to UV space in the shader so that the texture can be dynamically resized

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This commit is contained in:
Kovid Goyal 2016-10-27 15:36:08 +05:30
parent 736df601dc
commit e649cbbd59
2 changed files with 5 additions and 3 deletions
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3
kitty/develop_gl.py
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@ -23,13 +23,14 @@ void main() {
'''\
uniform sampler2DArray sprites;
uniform vec3 sprite_scale;
in vec3 texture_position_for_fs;
out vec4 final_color;
const vec3 background = vec3(0, 1, 0);
const vec3 foreground = vec3(0, 0, 1);
void main() {
float alpha = texture(sprites, texture_position_for_fs).r;
float alpha = texture(sprites, texture_position_for_fs / sprite_scale).r;
vec3 color = background * (1 - alpha) + foreground * alpha;
final_color = vec4(color, 1);
}

5
kitty/shaders.py
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@ -95,7 +95,7 @@ class Sprites:
offset_to_start_of_row += pixels_per_line
# UV space co-ordinates
left, top, z = self.x / self.xnum, self.y / self.ynum, len(self.previous_layers)
left, top, z = self.x, self.y, len(self.previous_layers)
# Now increment the current cell position
self.x += 1
@ -109,7 +109,7 @@ class Sprites:
self.texture_id = gl.glGenTextures(1)
self.current_layer_buffer = (gl.GLubyte * (self.width * self.height))()
self.commit_all_layers()
return left, top, left + self.dx, top + self.dy, z
return left, top, left + 1, top + 1, z
def __enter__(self):
gl.glActiveTexture(self.texture_unit)
@ -193,6 +193,7 @@ class ShaderProgram:
gl.glUseProgram(self.program_id)
gl.glBindVertexArray(self.vao_id)
gl.glUniform1i(self.uniform_location('sprites'), self.sprites.sampler_num)
gl.glUniform3f(self.uniform_location('sprite_scale'), self.sprites.xnum, self.sprites.ynum, 1)
self.sprites.__enter__()
self.is_active = True