fix linux build, fix small gl rendering issues

src/render/opengl/generated/render_opengl.meta.h

@@ -260,7 +260,7 @@ str8_lit_comp(
 "  \n"
 "  // rjf: sample for corners\n"
 "  float corner_sdf_s = rect_sdf(sdf_sample_pos, rect_half_size, corner_radius);\n"
-"  float corner_sdf_t = smoothstep(0, 2, corner_sdf_s);\n"
+"  float corner_sdf_t = 1-smoothstep(0, 2, corner_sdf_s);\n"
 "  \n"
 "  // rjf: weight output color by sdf\n"
 "  // this is doing alpha testing, leave blurring only where mostly opaque pixels are\n"

src/render/opengl/render_opengl.c

@@ -418,7 +418,7 @@ r_window_begin_frame(WM_Window os, R_Handle r)
       glBindFramebufferScope(GL_FRAMEBUFFER, targets[idx]->fbo)
         glBindTextureScope(GL_TEXTURE_2D, targets[idx]->color_texture)
       {
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (S32)client_rect_dim.x, (S32)client_rect_dim.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, (S32)client_rect_dim.x, (S32)client_rect_dim.y, 0, GL_RGBA, GL_FLOAT, 0);
         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, targets[idx]->color_texture, 0);  
       }
     }

src/render/opengl/render_opengl.h

@@ -52,6 +52,7 @@ typedef ptrdiff_t GLintptr;
 #define GL_COLOR_ATTACHMENT31             0x8CFF
 
 #define GL_R8                             0x8229
+#define GL_RGBA32F                        0x8814
 
 #define GL_ARRAY_BUFFER                   0x8892
 #define GL_STREAM_DRAW                    0x88E0

src/render/opengl/render_opengl.mdesk

@@ -282,7 +282,7 @@ void main(void)
   
   // rjf: sample for corners
   float corner_sdf_s = rect_sdf(sdf_sample_pos, rect_half_size, corner_radius);
-  float corner_sdf_t = smoothstep(0, 2, corner_sdf_s);
+  float corner_sdf_t = 1-smoothstep(0, 2, corner_sdf_s);
   
   // rjf: weight output color by sdf
   // this is doing alpha testing, leave blurring only where mostly opaque pixels are